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149 results on '"O. Stezowski"'

1. Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number

Author

R. Avigo, O. Wieland, A. Bracco, F. Camera, F. Ameil, T. Arici, A. Ataç, D. Barrientos, D. Bazzacco, P. Bednarczyk, G. Benzoni, B. Birkenbach, N. Blasi, H.C. Boston, S. Bottoni, S. Brambilla, B. Bruyneel, M. Ciemała, E. Clément, M.L. Cortés, F.C.L. Crespi, D.M. Cullen, D. Curien, F. Didierjean, C. Domingo-Pardo, G. Duchêne, J. Eberth, A. Görgen, A. Gadea, J. Gerl, N. Goel, P. Golubev, V. González, M. Górska, A. Gottardo, E. Gregor, G. Guastalla, T. Habermann, L.J. Harkness-Brennan, A. Jungclaus, M. Kmiecik, I. Kojouharov, W. Korten, N. Kurz, M. Labiche, N. Lalović, S. Leoni, M. Lettmann, A. Maj, R. Menegazzo, D. Mengoni, E. Merchan, B. Million, A.I. Morales, D.R. Napoli, C. Nociforo, J. Nyberg, N. Pietralla, S. Pietri, Zs. Podolyák, V.Yu. Ponomarev, A. Pullia, B. Quintana, G. Rainovski, D. Ralet, F. Recchia, M. Reese, P. Regan, P. Reiter, S. Riboldi, D. Rudolph, M.D. Salsac, E. Sanchis, L.G. Sarmiento, H. Schaffner, J. Simpson, O. Stezowski, J.J. Valiente-Dobón, and H.J. Wollersheim

Subjects
64Fe, 62Fe, Nuclear structure, Dipole excitation around neutron threshold, Physics, QC1-999
Abstract

The γ-ray emission from the nuclei 62,64Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei 62,64Fe were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. The γ decay was detected with AGATA. From the measured γ-ray spectra the summed E1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the E1 strength with increasing neutron number is found to be fairly well reproduced with calculations that assume a rather complex structure of the 1− states (three-phonon states) inducing a strong fragmentation of the E1 nuclear response below the neutron binding energy.

Published
2020
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2. Pairing-quadrupole interplay in the neutron-deficient tin nuclei: First lifetime measurements of low-lying states in 106,108Sn

Author

M. Siciliano, J.J. Valiente-Dobón, A. Goasduff, F. Nowacki, A.P. Zuker, D. Bazzacco, A. Lopez-Martens, E. Clément, G. Benzoni, T. Braunroth, F.C.L. Crespi, N. Cieplicka-Oryńczak, M. Doncel, S. Ertürk, G. de France, C. Fransen, A. Gadea, G. Georgiev, A. Goldkuhle, U. Jakobsson, G. Jaworski, P.R. John, I. Kuti, A. Lemasson, T. Marchi, D. Mengoni, C. Michelagnoli, T. Mijatović, C. Müller-Gatermann, D.R. Napoli, J. Nyberg, M. Palacz, R.M. Pérez-Vidal, B. Sayği, D. Sohler, S. Szilner, D. Testov, M. Zielińska, D. Barrientos, B. Birkenbach, H.C. Boston, A.J. Boston, B. Cederwall, J. Collado, D.M. Cullen, P. Désesquelles, C. Domingo-Pardo, J. Dudouet, J. Eberth, F.J. Egea-Canet, V. González, L.J. Harkness-Brennan, H. Hess, D.S. Judson, A. Jungclaus, W. Korten, M. Labiche, A. Lefevre, S. Leoni, H. Li, A. Maj, R. Menegazzo, B. Million, A. Pullia, F. Recchia, P. Reiter, M.D. Salsac, E. Sanchis, O. Stezowski, and Ch. Theisen

Subjects
Lifetime, Nuclear structure, Multi-nucleon transfer, Light Sn, Tracking array, Physics, QC1-999
Abstract

The lifetimes of the low-lying excited states 2+ and 4+ have been directly measured in the neutron-deficient 106,108Sn isotopes. The nuclei were populated via a deep-inelastic reaction and the lifetime measurement was performed employing a differential plunger device. The emitted γ rays were detected by the AGATA array, while the reaction products were uniquely identified by the VAMOS++ magnetic spectrometer. Large-Scale Shell-Model calculations with realistic forces indicate that, independently of the pairing content of the interaction, the quadrupole force is dominant in the B(E2;21+→0g.s.+) values and it describes well the experimental pattern for 104−114Sn; the B(E2;41+→21+) values, measured here for the first time, depend critically on a delicate pairing-quadrupole balance, disclosed by the very precise results in 108Sn.

Published
2020
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3. Evidence of octupole-phonons at high spin in 207Pb

Author

D. Ralet, E. Clément, G. Georgiev, A.E. Stuchbery, M. Rejmund, P. Van Isacker, G. de France, A. Lemasson, J. Ljungvall, C. Michelagnoli, A. Navin, D.L. Balabanski, L. Atanasova, A. Blazhev, G. Bocchi, R. Carroll, J. Dudouet, E. Dupont, B. Fornal, S. Franchoo, C. Fransen, C. Müller-Gatermann, A. Goasduff, A. Gadea, P.R. John, D. Kocheva, T. Konstantinopoulos, A. Korichi, A. Kusoglu, S.M. Lenzi, S. Leoni, R. Lozeva, A. Maj, R. Perez, N. Pietralla, C. Shand, O. Stezowski, D. Wilmsen, D. Yordanov, D. Barrientos, P. Bednarczyk, B. Birkenbach, A.J. Boston, H.C. Boston, I. Burrows, B. Cederwall, M. Ciemala, J. Collado, F. Crespi, D. Cullen, H.J. Eberth, J. Goupil, L. Harkness, H. Hess, A. Jungclaus, W. Korten, M. Labiche, R. Menegazzo, D. Mengoni, B. Million, J. Nyberg, Zs. Podolyák, A. Pullia, B. Quintana Arnés, F. Recchia, P. Reiter, F. Saillant, M.D. Salsac, E. Sanchis, C. Theisen, J.J. Valiente Dobon, and O. Wieland

Subjects
Physics, QC1-999
Abstract

A lifetime measurement of the 19/2− state in 207Pb has been performed using the Recoil Distance Doppler-Shift (RDDS) method. The nuclei of interest were produced in multi-nucleon transfer reactions induced by a 208Pb beam impinging on a 100Mo enriched target. The beam-like nuclei were detected and identified in terms of their atomic mass number in the VAMOS++ spectrometer while the prompt γ rays were detected by the AGATA tracking array. The measured large reduced transition probability B(E3,19/2−→13/2+)=40(8) W.u. is the first indication of the octupole phonon at high spin in 207Pb. An analysis in terms of a particle-octupole-vibration coupling model indicates that the measured B(E3) value in 207Pb is compatible with the contributions from single-phonon and single particle E3 as well as E3 strength arising from the double-octupole-phonon 6+ state, all adding coherently. A crucial aspect of the coupling model, namely the strong mixing between single-hole and the phonon-hole states, is confirmed in a realistic shell-model calculation. Keywords: AGATA spectrometer, γ-Ray tracking, VAMOS++ spectrometer, Plunger device, Nuclear deformation, Octupole phonon

Published
2019
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4. Pygmy dipole resonance in 124Sn populated by inelastic scattering of 17O

Author

L. Pellegri, A. Bracco, F.C.L. Crespi, S. Leoni, F. Camera, E.G. Lanza, M. Kmiecik, A. Maj, R. Avigo, G. Benzoni, N. Blasi, C. Boiano, S. Bottoni, S. Brambilla, S. Ceruti, A. Giaz, B. Million, A.I. Morales, R. Nicolini, V. Vandone, O. Wieland, D. Bazzacco, P. Bednarczyk, M. Bellato, B. Birkenbach, D. Bortolato, B. Cederwall, L. Charles, M. Ciemala, G. De Angelis, P. Désesquelles, J. Eberth, E. Farnea, A. Gadea, R. Gernhäuser, A. Görgen, A. Gottardo, J. Grebosz, H. Hess, R. Isocrate, J. Jolie, D. Judson, A. Jungclaus, N. Karkour, M. Krzysiek, E. Litvinova, S. Lunardi, K. Mazurek, D. Mengoni, C. Michelagnoli, R. Menegazzo, P. Molini, D.R. Napoli, A. Pullia, B. Quintana, F. Recchia, P. Reiter, M.D. Salsac, B. Siebeck, S. Siem, J. Simpson, P.-A. Söderström, O. Stezowski, Ch. Theisen, C. Ur, J.J. Valiente Dobon, and M. Zieblinski

Subjects
Physics, QC1-999
Abstract

The γ decay from the high-lying states of 124Sn was measured using the inelastic scattering of 17O at 340 MeV. The emitted γ rays were detected with high resolution with the AGATA demonstrator array and the scattered ions were detected in two segmented ΔE–E silicon telescopes. The angular distribution was measured both for the γ rays and the scattered 17O ions. An accumulation of E1 strength below the particle threshold was found and compared with previous data obtained with (γ,γ′) and (α,α′γ) reactions. The present results of elastic scattering, and excitation of E2 and E1 states were analysed using the DWBA approach. From this comprehensive description the isoscalar component of the 1− excited states was extracted. The obtained values are based on the comparison of the data with DWBA calculations including a form factor deduced using a microscopic transition density. Keywords: Low-lying electric dipole excitations, 124Sn, Isospin character

Published
2014
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5. Reinterpretation of excited states in Po212 : Shell-model multiplets rather than α -cluster states

Author

B. Million, E. Dupont, Bertrand Jacquot, R. Menegazzo, M. Ciemala, M. Zielińska, R. M. Perez-Vidal, L. J. Harkness-Brennan, D. Mengoni, Vicente González, W. Korten, D. Kocheva, D. Ralet, D. R. Napoli, P. Reiter, J. Eberth, Zs. Podolyák, A. Astier, B. Birkenbach, C. Michelagnoli, G. Tocabens, A. Perea, J. Dudouet, Ch. Lorenz, A. Bracco, A. Maj, M. Jurado, Begoña Quintana, A. Fernández, H. C. Boston, J. Ropert, J. Ljungvall, L. Ménager, Dirk Rudolph, G. Benzoni, H. Naïdja, E. Nácher, A. Korichi, A. Jungclaus, K. Wimmer, J. J. Valiente-Dobón, C. Houarner, A. Gadea, Johan Nyberg, J. Collado, A. Pullia, A. Gargano, Hans-Jurgen E. Hess, A. J. Boston, Emyr Clement, J. Goupil, A. Såmark-Roth, Enrique Sanchis, Diego Barrientos, S. Leoni, G. Frémont, N. Lalović, F. Saillant, D. S. Judson, O. Stezowski, A. Lemasson, C. Spitaels, S. Ansari, G. S. Simpson, D. M. Cullen, A. Illana, N. Redon, Luis Sarmiento, C. M. Petrache, G. Rainovski, Ch. Theisen, H. J. Li, C. Domingo-Pardo, and Pavel Golubev

Subjects
Reinterpretation, Physics, 010308 nuclear & particles physics, Excited state, 0103 physical sciences, SHELL model, Cluster (physics), Atomic physics, 010306 general physics, 01 natural sciences
Published
2021

6. Evidence for enhanced neutron-proton correlations from the level structure of the N=Z+1 nucleus Tc444387

Author

X. Liu, B. Cederwall, C. Qi, R. A. Wyss, Ö. Aktas, A. Ertoprak, W. Zhang, E. Clément, G. de France, D. Ralet, A. Gadea, A. Goasduff, G. Jaworski, I. Kuti, B. M. Nyakó, J. Nyberg, M. Palacz, R. Wadsworth, J. J. Valiente-Dobón, H. Al-Azri, A. Ataç Nyberg, T. Bäck, G. de Angelis, M. Doncel, J. Dudouet, A. Gottardo, M. Jurado, J. Ljungvall, D. Mengoni, D. R. Napoli, C. M. Petrache, D. Sohler, J. Timár, D. Barrientos, P. Bednarczyk, G. Benzoni, B. Birkenbach, A. J. Boston, H. C. Boston, I. Burrows, L. Charles, M. Ciemala, F. C. L. Crespi, D. M. Cullen, P. Désesquelles, C. Domingo-Pardo, J. Eberth, N. Erduran, S. Ertürk, V. González, J. Goupil, H. Hess, T. Huyuk, A. Jungclaus, W. Korten, A. Lemasson, S. Leoni, A. Maj, R. Menegazzo, B. Million, R. M. Perez-Vidal, Zs. Podolyàk, A. Pullia, F. Recchia, P. Reiter, F. Saillant, M. D. Salsac, E. Sanchis, J. Simpson, O. Stezowski, C. Theisen, and M. Zielińska

Subjects
Physics, Proton, Spectrometer, 010308 nuclear & particles physics, Isoscalar, Nuclear Theory, 01 natural sciences, Charged particle, Excited state, 0103 physical sciences, Level structure, Neutron, AGATA, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The low-lying excited states in the neutron-deficient $N = Z + 1$ nucleus $^{87}_{43}$Tc$_{44}$ have been studied via the fusion-evaporation reaction $^{54}$Fe $(^{36}Ar, 2n1p)$ $^{87}$Tc at the Grand Accelerateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt γ rays, neutrons, and charged particles emitted in the reaction. A level scheme of $^{87}$Tc from the $(9/2^+_{g.s})$ state to the $( 33 / 2^+_1$) state was established based on six mutually coincident γ -ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at $ℏω ≈ 0.50$ MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around $N=44$ is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the $N=Z$ line.

Published
2021

7. Using γ rays to disentangle fusion-fission and quasifission near the Coulomb barrier: A test of principle in the fusion-fission and quasielastic channels

Author

C. Petrone, C. Borcea, A. Maj, K. V. Novikov, G. N. Knyazheva, Emanuele Vardaci, V. V. Kirakosyan, A. Bracco, S. Brambilla, G. Sposito, D. Verney, I. M. Harca, D. Quero, K. Saveleva, John W. Wilson, A. Pulcini, S. Calinescu, I. V. Kolesov, M. Ciemala, O. Dorvaux, E. M. Kozulin, F. Camera, I. M. Itkis, O. Stezowski, M. Ashaduzzaman, B. de Canditiis, C. Schmitt, D. Pierroutsakou, A. Di Nitto, P. K. Rath, G. La Rana, C. Parascandolo, N. I. Kozulina, I. Matea, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Physics, Nuclear reaction, Angular momentum, Photon, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Spectrometer, Mass distribution, 010308 nuclear & particles physics, Coulomb barrier, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Ion, Nuclear physics, 0103 physical sciences, Nuclear Reactions, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The overlap in the mass symmetric region of the reaction products from fusion-fission and quasifission complicates the assignment of symmetric events to complete fusion on the basis of the mass distribution alone. Additional observables, besides mass distribution, should be used. The approach proposed here relies on the fact that fusion-fission and quasifission are characterized by different timescales. Within this framework, we performed a detailed study to find out how timescales can be probed via angular momentum transfer as measured via γ-ray multiplicities. The proof of principle was carried out by measuring the γ rays in coincidence with fusion-fission and quasielastic binary fragments in the reaction S32 + Au197 at beam energy near the Coulomb barrier. The experiment was performed at the Accélérateur Linéaire Tandem à Orsay (ALTO) facility at the Institut De Physique Nucléaire (IPN) in Orsay (France) using a detection setup consisting of ORGAM (ORsay GAMma) and PARIS (Photon Array Radioactive Ion Stable beams) γ-detectors arrays coupled with the CORSET (CORrelation SETup) time-of-flight spectrometer. Results of the sensitivity of this method to distinguish reaction channels with different dynamics are discussed.

Published
2020

8. Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2+ state in C16 and O20

Author

M. Ciemała, S. Ziliani, F. C. L. Crespi, S. Leoni, B. Fornal, A. Maj, P. Bednarczyk, G. Benzoni, A. Bracco, C. Boiano, S. Bottoni, S. Brambilla, M. Bast, M. Beckers, T. Braunroth, F. Camera, N. Cieplicka-Oryńczak, E. Clément, S. Coelli, O. Dorvaux, S. Erturk, G. de France, C. Fransen, A. Goldkuhle, J. Grębosz, M. N. Harakeh, Ł. W. Iskra, B. Jacquot, A. Karpov, M. Kicińska-Habior, Y. Kim, M. Kmiecik, A. Lemasson, S. M. Lenzi, M. Lewitowicz, H. Li, I. Matea, K. Mazurek, C. Michelagnoli, M. Matejska-Minda, B. Million, C. Müller-Gatermann, V. Nanal, P. Napiorkowski, D. R. Napoli, R. Palit, M. Rejmund, Ch. Schmitt, M. Stanoiu, I. Stefan, E. Vardaci, B. Wasilewska, O. Wieland, M. Zieblinski, M. Zielińska, A. Ataç, D. Barrientos, B. Birkenbach, A. J. Boston, B. Cederwall, L. Charles, J. Collado, D. M. Cullen, P. Désesquelles, C. Domingo-Pardo, J. Dudouet, J. Eberth, V. González, J. Goupil, L. J. Harkness-Brennan, H. Hess, D. S. Judson, A. Jungclaus, W. Korten, M. Labiche, A. Lefevre, R. Menegazzo, D. Mengoni, J. Nyberg, R. M. Perez-Vidal, Zs. Podolyak, A. Pullia, F. Recchia, P. Reiter, F. Saillant, M. D. Salsac, E. Sanchis, O. Stezowski, Ch. Theisen, J. J. Valiente-Dobón, J. D. Holt, J. Menéndez, A. Schwenk, and J. Simonis

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Nuclear structure, Ab initio, Neutron, State (functional analysis), Atomic physics, 010306 general physics, 7. Clean energy, 01 natural sciences, Nuclear theory
Abstract

To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2(+) state in neutron-rich O-20, tau(2(2)(+)) = 150(-30)(+80) fs, and an estimate for the lifetime of ...

Published
2020

9. Isospin Properties of Nuclear Pair Correlations from the Level Structure of the Self-Conjugate Nucleus Ru88

Author

Eric Clément, B. Birkenbach, M. Zielińska, B. Million, M. Doncel, C. Domingo-Pardo, F. Recchia, J. Ljungvall, R. M. Perez-Vidal, Torbjörn Bäck, P. Reiter, P. Bednarczyk, J. Simpson, D. Mengoni, J. J. Valiente-Dobón, A. Lemasson, W. Korten, W. Zhang, X. Liu, B. M. Nyako, A. J. Boston, J. Goupil, H. Al-Azri, Diego Barrientos, M. D. Salsac, F. C. L. Crespi, A. Jungclaus, A. Gadea, A. Maj, N. Erduran, P. Désesquelles, A. Gottardo, Ch. Theisen, T. Hüyük, János Timár, Alberto Pullia, Vicente González, L. Charles, Zs. Podolyák, R. Menegazzo, C. M. Petrache, D. M. Cullen, S. Erturk, A. Ataç Nyberg, M. Jurado, Herbert Hess, Chong Qi, O. Aktas, Bo Cederwall, István Kuti, D. R. Napoli, Johan Nyberg, Alain Goasduff, D. Ralet, Enrique Sanchis, A. Ertoprak, M. Palacz, F. Saillant, D. Sohler, O. Stezowski, R. Wadsworth, J. Dudouet, G. de Angelis, M. Ciemala, G. Jaworski, J. Eberth, H. C. Boston, G. Benzoni, I. Burrows, and S. Leoni

Subjects
Physics, Isovector, Isoscalar, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, Charged particle, Nuclear physics, 13. Climate action, Isospin, Excited state, 0103 physical sciences, Neutron detection, AGATA, Neutron, Nuclear Experiment, 010306 general physics
Abstract

The low-lying energy spectrum of the extremely neutron-deficient self-conjugate (N = Z) nuclide 88 44Ru44 has been measured using the combination of the Advanced Gamma Tracking Array (AGATA) spectrometer, the NEDA and Neutron Wall neutron detector arrays, and the DIAMANT charged particle detector array. Excited states in 88Ru were populated via the 54Fe(36Ar; 2n )88Ru fusion-evaporation reaction at the Grand Acc�el�erateur National d'Ions Lourds (GANIL) accelerator complex. The observed -ray cascade is assigned to 88Ru using clean prompt - -2-neutron coincidences in anti-coincidence with the detection of charged particles, con�rming and extending the previously assigned sequence of low-lying excited states. It is consistent with a moderately deformed rotating system exhibiting a band crossing at a rotational frequency that is significantly higher than standard theoretical predictions with isovector pairing, as well as observations in neighboring N > Z nuclides. The direct observation of such a \delayed" rotational alignment in a deformed N = Z nucleus is in agreement with theoretical predictions related to the presence of strong isoscalar neutron-proton pair correlations.

Published
2020

10. Low-lying electric dipole gamma-continuum for the unstable Fe-62,64 nuclei : Strength evolution with neutron number

Author

Eric Clément, B. Birkenbach, A. I. Morales, D. Bazzacco, H. J. Wollersheim, J. J. Valiente-Dobón, D. M. Cullen, L. J. Harkness-Brennan, M. Kmiecik, Alberto Pullia, C. Domingo-Pardo, Luis Sarmiento, C. Nociforo, N. Goel, B. Bruyneel, G. Rainovski, M.D. Salsac, S. Pietri, Begoña Quintana, J. Simpson, Pavel Golubev, T. Habermann, Johan Nyberg, R. Menegazzo, S. Leoni, M. Reese, V. Yu. Ponomarev, A. Maj, T. Arici, A. Gottardo, N. Kurz, M. Górska, S. Brambilla, I. Kojouharov, E. Merchan, M. L. Cortés, Stefano Riboldi, Enrique Sanchis, N. Lalović, Vicente González, R. Avigo, Norbert Pietralla, P. Reiter, F. Camera, M. Labiche, Zs. Podolyák, J. Gerl, D. Ralet, F. Ameil, Andreas Görgen, A. Gadea, A. Bracco, A. Jungclaus, G. Benzoni, O. Stezowski, Dirk Rudolph, D. Curien, J. Eberth, H. C. Boston, S. Bottoni, W. Korten, F. C. L. Crespi, N. Blasi, H. Schaffner, D. Mengoni, M. Lettmann, G. Duchêne, Diego Barrientos, P. H. Regan, F. Didierjean, M. Ciemala, P. Bednarczyk, G. Guastalla, B. Million, E. Gregor, Oliver Wieland, F. Recchia, D. R. Napoli, A. Atac, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Istituto Nazionale di Fisica Nucleare, Science and Technology Facilities Council (UK), Swedish Research Council, Federal Ministry of Education and Research (Germany), European Commission, Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Phonon, Astrophysics::High Energy Astrophysical Phenomena, Binding energy, Nuclear Theory, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 64Fe, Dipole excitation around neutron threshold, 62Fe, Subatomär fysik, 0103 physical sciences, Subatomic Physics, ddc:530, Neutron, Nuclear Physics - Experiment, Nuclear structure, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, 62 Fe, Fe, 64, 64 Fe, lcsh:QC1-999, Dipole, Fe-64, Neutron number, Fe-62, AGATA, Atomic physics, lcsh:Physics
Abstract

6 pags., 4 figs., The γ-ray emission from the nuclei Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei Fe were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. The γ decay was detected with AGATA. From the measured γ-ray spectra the summed E1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the E1 strength with increasing neutron number is found to be fairly well reproduced with calculations that assume a rather complex structure of the 1 states (three-phonon states) inducing a strong fragmentation of the E1 nuclear response below the neutron binding energy., This work was partially supported by INFN (Italy) and STFC (UK), the Swedish Research Council (Vetenskapsrådet, VR 2010-147, 2011-5253, and 2016-3969), BMBF NuSTAR-AGATA 05P18RDFN9 and BMBF NuSTAR 05P18RDFN1. The project was co-funded by the European Commission under the 7th Framework Program for RTD (2007-2013) under the Capacities Program (Contract Number 262010, ENSAR). This work was par-tially supported by the Ministry of Science, and Generalitat Valenciana, Spain, under the Grants SEV-2014-0398, FPA2017-84756-C4, PROMETEO/2019/005 and by the EU FEDER funds.

Published
2020

11. Pairing-quadrupole interplay in the neutron-deficient tin nuclei: First lifetime measurements of low-lying states in 106,108Sn

Author

R. M. Perez-Vidal, T. Marchi, P. Reiter, Georgi P. Georgiev, Andrés P. Zuker, C. Fransen, D. Mengoni, J. Dudouet, Bo Cederwall, C. Theisen, C. Domingo-Pardo, Thomas Braunroth, A. Goasduff, O. Stezowski, W. Korten, F. C. L. Crespi, A. J. Boston, Johan Nyberg, C. Michelagnoli, B. Birkenbach, Vicente González, C. Müller-Gatermann, Tea Mijatović, D. Bazzacco, Hui Li, Enrique Sanchis, D. S. Judson, N. Cieplicka-Oryńczak, B. Million, Diego Barrientos, S. Leoni, M. Labiche, L. J. Harkness-Brennan, A. Jungclaus, F. Recchia, D. Testov, F.J. Egea-Canet, Herbert Hess, J. Eberth, H. C. Boston, A. Lefevre, J. Collado, István Kuti, A. Lemasson, Dóra Sohler, Alberto Pullia, M. D. Salsac, M. Siciliano, A. Gadea, D. R. Napoli, G. Jaworski, A. Lopez-Martens, S. Szilner, G. Benzoni, Maria Doncel, Eric Clément, M. Palacz, P. R. John, M. Zielińska, P. Désesquelles, B. Sayği, Ulrika Jakobsson, J. J. Valiente-Dobón, A. Maj, R. Menegazzo, S. Erturk, F. Nowacki, D. M. Cullen, A. Goldkuhle, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ege Üniversitesi, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, Light Sn, chemistry.chemical_element, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Subatomär fysik, Lifetime, Multi-nucleon transfer, Nuclear structure, Tracking array, 0103 physical sciences, Subatomic Physics, Neutron, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Spectrometer, Isotope, 010308 nuclear & particles physics, lcsh:QC1-999, chemistry, Pairing, Excited state, Quadrupole, AGATA, Atomic physics, Tin, lcsh:Physics
Abstract

The lifetimes of the low-lying excited states 2(+) and 4(+) have been directly measured in the neutron-deficient Sn-106,Sn-108 isotopes. the nuclei were populated via a deep-inelastic reaction and the lifetime measurement was performed employing a differential plunger device. the emitted gamma rays were detected by the AGATA array, while the reaction products were uniquely identified by the VAMOS++ magnetic spectrometer. Large-Scale Shell-Model calculations with realistic forces indicate that, independently of the pairing content of the interaction, the quadrupole force is dominant in the B(E2; 2(1)(+) -> 0(g.s)(+)) values and it describes well the experimental pattern for Sn104-114 ; the B(E2;(+)(4) -> 2(1)(+)) values, measured here for the first time, depend critically on a delicate pairing-quadrupole balance, disclosed by the very precise results in Sn-108. (C) 2020 the Authors. Published by Elsevier B.V., European Union's Seventh Framework Programme for Research and Technological DevelopmentEuropean Union (EU) [262010]; Fondazione Cassa di Risparmio Padova e Rovigo under the project CONPHYT, starting grant in 2017; Swedish Research CouncilSwedish Research Council [822-2005-3332, 821-2010-6024, 821-2013-2304, 621-20145558, 2017-0065]; Knut and Alice Wallenberg FoundationKnut & Alice Wallenberg Foundation [2005.0184]; Scientific and Technological Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [114F473]; Ministerio de Ciencia e InnovacionInstituto de Salud Carlos IIISpanish Government [SEV-2014-0398, FPA2017-84756-C4, EEBBI-15-09671]; Generalitat ValencianaGeneralitat Valenciana [PROMETEO/2019/005]; EU-FEDER fundsEuropean Union (EU); Croatian Science Foundation [7194]; Hungarian National Research and Innovation Office (NKFIH) [K128947, PD124717, GINOP-2.3.3-15-2016-00034]; Polish National Science Centre under the COPIN-IN2P3 project [2014-14-M-ST2-00738, 2016-22M-ST2-00269, 2017-25-B-ST2-01569]; Polish National Science Centre under the COPIGAL project [2014-14-M-ST2-00738, 2016-22M-ST2-00269, 2017-25-B-ST2-01569]; Polish National Science Centre under the POLITA project [2014-14-M-ST2-00738, 2016-22M-ST2-00269, 2017-25-B-ST2-01569], The authors would like to thank the AGATA and VAMOS collaborations. Special thanks go to the GANIL technical staff for their help in setting up the apparatuses and the good quality beam and to A. Poves for his fruitful comments. This work was partially supported by the European Union's Seventh Framework Programme for Research and Technological Development (grant no. 262010). A.G. acknowledges the support of the Fondazione Cassa di Risparmio Padova e Rovigo under the project CONPHYT, starting grant in 2017. the work was also supported (B.C, H.L., J.N. and U.J.) by Swedish Research Council under the grant agreements nos. 822-2005-3332, 821-2010-6024, 821-2013-2304, 621-20145558 and 2017-0065, and by the Knut and Alice Wallenberg Foundation grant no. 2005.0184, (B.S.) by the Scientific and Technological Council of Turkey (TUBITAK) under the project no. 114F473, (A.G., A.J. and R.P.) by the Ministerio de Ciencia e Innovacion under the contracts nos. SEV-2014-0398, FPA2017-84756-C4 and EEBBI-15-09671, by the Generalitat Valenciana under the grant agreement no. PROMETEO/2019/005 and by the EU-FEDER funds, (T.M and S.S.) by the Croatian Science Foundation under the project no. 7194, (I.K and D.S.) by the Hungarian National Research and Innovation Office (NKFIH) under the project nos. K128947, PD124717 and GINOP-2.3.3-15-2016-00034, (M.P.) by the Polish National Science Centre with the grants nos. 2014-14-M-ST2-00738, 2016-22M-ST2-00269 and 2017-25-B-ST2-01569 under the COPIN-IN2P3, COPIGAL and POLITA projects.

Published
2020

12. Features of the Fission Fragments Formed in the Heavy Ion induced $^{32}\hbox {S}$+$^{197}\hbox {Au}$ reaction near the interaction barrier

Author

G. N. Knyazheva, Emanuele Vardaci, O. Dorvaux, P.K. Rath, D. Verney, E. M. Kozulin, B. Decanditiis, S. Brambilla, E. Saveleva, D. Quero, G. La Rana, J. N. Wilson, S. Calinescu, N. I. Kozulina, C. Schmitt, I. M. Itkis, F. Camera, A. Bracco, K. V. Novikov, W. H. Trzaska, O. Stezowski, I. Matea, A. Pulcini, I. M. Harca, A. Di Nitto, M. Ciemala, V. V. Kirakosyan, C. Petrone, M. Ashaduzzaman, I. V. Kolesov, C. Borcea, A. Maj, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), SPS, PARIS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Kozulin, E. M., Harca, I. M., Vardaci, E., Matea, I., Maj, A., Itkis, I., Knyazheva, G., Novikov, K., Dorvaux, O., Ciemala, M., Brambilla, S., Kozulina, N., Kolesov, I. V., Saveleva, E., Kirakosyan, V. V., Schmitt, C., Borcea, C., Calinescu, S., Petrone, C., Ashaduzzaman, M., Decanditiis, B., Pulcini, A., Quero, D., Rath, P., di Nitto, A., La Rana, G., Bracco, A., Camera, F., Stezowski, O., Wilson, J., Verney, D., and Trzaska, W. H.

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Hadron, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Semi-empirical mass formula, Yield (chemistry), 0103 physical sciences, Physics::Atomic and Molecular Clusters, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract

International audience; The features of fission fragments formed in the near barrier reaction $^{32}\hbox {S}$ + $^{197}\hbox {Au}$ ($E^\mathrm{lab}_\mathrm{beam}=166\,\hbox {MeV}$) are investigated. The measurement was performed at the ALTO facility of IPN Orsay, France, with the aim of clarifying the quantitative contribution of the quasi-fission process to the total fission events. The mass and total kinetic energy of the fission fragments were compared to the expectations of the liquid drop model, revealing an asymmetric fission component which may be traced back to a quasi-fission process mixed with the fusion–fission events. The $\gamma $-rays and neutrons measured in coincidence with the fission fragments were used to yield additional information for the discrimination of the two aforementioned mechanisms. All observed trends are consistent and fairly well reproduced by the statistical model.

Published
2020

13. Performance of a gamma-ray tracking array: Characterizing the AGATA array using a 60Co source

Author

A. Korichi, A.N. Wilson, Eric Clément, R.M. Perez-Vidal, T. Lauritsen, O. Stezowski, S. Pietri, N. Lalović, D. Ralet, J. Dudouet, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Previous generation, Efficiency measurements, 010308 nuclear & particles physics, business.industry, Emphasis (telecommunications), Detector, Gamma ray, ray spectroscopy, Tracking (particle physics), 01 natural sciences, Optics, 0103 physical sciences, ray tracking, AGATA, Nuclear structure, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Segmented germanium detectors, 010306 general physics, business, Instrumentation
Abstract

International audience; The AGATA (Advanced GAmma Tracking Array) tracking detector is being designed to far surpass the performance of the previous generation, Compton-suppressed arrays. In this paper, a characterization of AGATA is provided based on data from the second GSI campaign. Emphasis is placed on the proper corrections required to extract the absolute photopeak efficiency and peak-to-total ratio. The performance after tracking is extracted and GEANT4 simulations are used both to understand the results and to scale the measurements up to predicted values for the full 4π implementation of the device.

Published
2017

14. Lifetime measurements in Ti52,54 to study shell evolution toward N=32

Author

A. Lemasson, W. Korten, Thomas Braunroth, Herbert Hess, C. Müller-Gatermann, C. Domingo-Pardo, J. Simpson, I. Burrows, S. Leoni, P. Reiter, C. Fransen, A. Vogt, Bertrand Jacquot, C. Houarner, D. M. Cullen, C. Henrich, A. Lefevre, A. Atac, M. Zielińska, M. Ciemala, N. Ménard, F. Legruel, A. J. Boston, J. Eberth, A. Goldkuhle, M. Labiche, H. C. Boston, Alberto Pullia, G. Voltolini, K. O. Zell, A. Korichi, J. Ljungvall, R. M. Pérez-Vidal, L. Ménager, J.-L. Foucher, C. Barthe-Dejean, C. Michelagnoli, Diego Barrientos, A. Dewald, J. Ropert, B. Birkenbach, Y. H. Kim, O. Stezowski, P. Bourgault, A. Blazhev, G. Frémont, J. Goupil, D. Ralet, Bo Cederwall, G. Benzoni, Ch. Theisen, N. Warr, A. Gadea, H. J. Li, A. Maj, Johan Nyberg, M. D. Salsac, S. M. Lenzi, M. Jean, J. J. Valiente Dobon, C. Maugeais, L. Legeard, P. Gangnant, A. Navin, M. Ozille, B. Million, M. Tripon, B. S. Nara Singh, Enrique Sanchis, D. R. Napoli, Emyr Clement, J. Dudouet, F. Saillant, Vicente González, F. Recchia, Ch. Schmitt, H. Munoz, Zs. Podolyák, B. Raine, M. Beckers, Roberto Menegazzo, D. Mengoni, J. Cacitti, J. Litzinger, J. Jolie, D. S. Judson, C. Spitaels, and M. Toulemonde

Subjects
Plunger, Physics, 010308 nuclear & particles physics, Excited state, Nuclear Theory, 0103 physical sciences, Shell (structure), Atomic physics, Nuclear Experiment, 010306 general physics, 7. Clean energy, 01 natural sciences
Abstract

Lifetimes of the excited states in the neutron-rich Ti-52,Ti-54 nuclei, produced in a multinucleon-transfer reaction, were measured by employing the Cologne plunger device and the recoil-distance D ...

Published
2019

15. Isomer spectroscopy in Ba133 and high-spin structure of Ba134

Author

E. Farnea, H. K. Wang, C. Fransen, K. Schomacker, A. Gadea, W. Korten, P. Reiter, N. Saed-Samii, A. Jungclaus, L. Corradi, A. Vogt, Hans-Jurgen E. Hess, L. Kaya, K. O. Zell, Suzana Szilner, O. Stezowski, A. Blazhev, J. Eberth, A. Bracco, G. Pollarolo, V. Karayonchev, E. Teruya, B. Birkenbach, A. Esmaylzadeh, T. Mijatović, M. Droste, A. M. Stefanini, N. Shimizu, B. Bruyneel, E. Fioretto, Nunzio Itaco, A. Giaz, Yutaka Utsuno, A. Gottardo, L. Kornwebel, F. Recchia, Zs. Podolyák, F. Scarlassara, R. Menegazzo, S. Leoni, L. Coraggio, A. Gargano, G. Montagnoli, R. Hirsch, F. C. L. Crespi, K. Arnswald, J. Jolie, D. Bazzacco, L. Lewandowski, D. Mengoni, J.-M. Régis, C. Michelagnoli, K. Yanase, E. Sahin, D. R. Napoli, C. Müller-Gatermann, K. Wolf, B. Siebeck, C. A. Ur, K. Hadynska-Klek, M. Seidlitz, S. Lunardi, D. Montanari, M. Siciliano, B. Szpak, G. de Angelis, Andreas Görgen, P. R. John, J. J. Valiente-Dobón, Naotaka Yoshinaga, and P. A. Söderström

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Yrast, 0103 physical sciences, Tandem accelerator, Atomic physics, Spin structure, 010306 general physics, Spectroscopy, 7. Clean energy, 01 natural sciences
Abstract

The transitional nuclei $^{134}$Ba and $^{133}$Ba are investigated after multinucleon transfer employing the high-resolution Advanced GAmma Tracking Array coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and after fusion-evaporation reaction at the FN tandem accelerator of the University of Cologne, Germany. The Jπ=19/2+ state at 1942 keV in $^{133}$Ba is identified as an isomer with a half-life of 66.6(20)ns corresponding to a B(E1) value of 7.7(4)×10−6e2fm2 for the Jπ=19/2+ to Jπ=19/2− transition. The level scheme of $^{134}$Ba above the Jπ=10+ isomer is extended to approximately 6 MeV. A pronounced backbending is observed at ℏω=0.38 MeV along the positive-parity yrast band. The results are compared to the high-spin systematics of the Z=56 isotopes. Large-scale shell-model calculations employing the GCN50:82, SN100PN, SNV, PQM130, Realistic SM, and EPQQM interactions reproduce the experimental findings and elucidate the structure of the high-spin states. The shell-model calculations employing the GCN50:82 and PQM130 interactions reproduce alignment properties and provide detailed insight into the microscopic origin of this phenomenon in transitional $^{134}$Ba.

Published
2019

16. Evidence of octupole-phonons at high spin in 207Pb

Author

B. Quintana Arnés, G. Bocchi, R. Perez, Raymond J. Carroll, W. Korten, Alberto Pullia, M. Labiche, Zs. Podolyák, A. Navin, Enrique Sanchis, F. Saillant, Norbert Pietralla, F. C. L. Crespi, C. M. Shand, E. Dupont, B. Fornal, D. Kocheva, Diego Barrientos, O. Stezowski, P. Reiter, L. Atanasova, M. Ciemala, Herbert Hess, Roberto Menegazzo, D. Mengoni, B. Birkenbach, J. Collado, H.J. Eberth, Bo Cederwall, D. Ralet, B. Million, A. Maj, P. Van Isacker, D. Wilmsen, J. J. Valiente Dobon, J. Dudouet, F. Recchia, P. Bednarczyk, M. Rejmund, Georgi P. Georgiev, Andrew Stuchbery, A. Goasduff, A. Lemasson, Deyan Yordanov, P. R. John, Salsac, R. L. Lozeva, A. Jungclaus, C. Michelagnoli, A. Blazhev, J. Goupil, S. Franchoo, A. Gadea, L. J. Harkness, Johan Nyberg, S. M. Lenzi, D. L. Balabanski, D. M. Cullen, I. Burrows, T. Konstantinopoulos, Emyr Clement, H. C. Boston, O. Wieland, C. Theisen, A. J. Boston, A. Kusoglu, C. Fransen, A. Korichi, S. Leoni, C. Müller-Gatermann, J. Ljungvall, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Plunger device, Phonon, Nuclear Theory, Octupole phonon, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], gamma-Ray tracking, γ -Ray tracking, 01 natural sciences, 7. Clean energy, Recoil, VAMOS++ spectrometer, AGATA spectrometer, Nuclear deformation, γ-Ray tracking, 0103 physical sciences, Physics::Atomic Physics, Nuclear Experiment, 010306 general physics, Spin (physics), Physics, VAMOS plus plus spectrometer, 010308 nuclear & particles physics, lcsh:QC1-999, Atomic physics, lcsh:Physics
Abstract

A lifetime measurement of the 19/2 state in Pb has been performed using the Recoil Distance Doppler-Shift (RDDS) method. The nuclei of interest were produced in multi-nucleon transfer reactions induced by a Pb beam impinging on a Mo enriched target. The beam-like nuclei were detected and identified in terms of their atomic mass number in the VAMOS++ spectrometer while the prompt γ rays were detected by the AGATA tracking array. The measured large reduced transition probability B(E3,19/2→13/2)=40(8) W.u. is the first indication of the octupole phonon at high spin in Pb. An analysis in terms of a particle-octupole-vibration coupling model indicates that the measured B(E3) value in Pb is compatible with the contributions from single-phonon and single particle E3 as well as E3 strength arising from the double-octupole-phonon 6 state, all adding coherently. A crucial aspect of the coupling model, namely the strong mixing between single-hole and the phonon-hole states, is confirmed in a realistic shell-model calculation.

Published
2019

17. Excitations of the magic N=50 neutron-core revealed in Ga81

Author

J. Dudouet, A. Lemasson, G. Maquart, F. Nowacki, D. Verney, M. Rejmund, G. Duchêne, O. Stezowski, E. Clément, C. Michelagnoli, A. Korichi, C. Andreoiu, A. Astier, G. de Angelis, G. de France, C. Delafosse, I. Deloncle, F. Didierjean, Z. Dombradi, C. Ducoin, A. Gadea, A. Gottardo, D. Guinet, B. Jacquot, P. Jones, T. Konstantinopoulos, I. Kuti, F. Le Blanc, S. M. Lenzi, G. Li, R. Lozeva, B. Million, D. R. Napoli, A. Navin, R. M. Pérez-Vidal, C. M. Petrache, D. Ralet, M. Ramdhane, N. Redon, C. Schmitt, and D. Sohler

Subjects
Physics, Valence (chemistry), 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, 01 natural sciences, Ion, 0103 physical sciences, Physics::Atomic and Molecular Clusters, AGATA, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy, Excitation
Abstract

The high-spin states of the neutron-rich Ga81, with three valence protons outside a Ni78 core, were measured. The measurement involved prompt γ-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer (VAMOS++) and the advanced gamma tracking array (AGATA). The new γ-ray transitions, observed in coincidence with Ga81 ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in Ga81 are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic N=50 neutron core. These results support the doubly magic character of Ni78 and the persistence of the N=50 shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic N=50 shell gap, only few nucleons away from Ni78.

Published
2019

18. Effects of one valence proton on seniority and angular momentum of neutrons in neutron-rich Sb51122–131 isotopes

Author

L. J. Harkness-Brennan, H. L. Crawford, Alberto Pullia, M. Rejmund, A. Jungclaus, B. Birkenbach, G. Benzoni, A. Lefevre, J. J. Valiente-Dobón, J. Goupil, Bo Cederwall, M. D. Salsac, P. Bednarczyk, Ch. Theisen, H. J. Li, A. J. Boston, R. Banik, Diego Barrientos, Vicente González, J. Eberth, O. Stezowski, Sumita Bhattacharyya, V. Morel, H. C. Boston, D. Ralet, D. Mengoni, A. Lemasson, D. M. Cullen, I. Stefan, Bertrand Jacquot, R. Menegazzo, D. R. Napoli, Herbert Hess, J. Collado, P. Fallon, J. Dudouet, C. Michelagnoli, R. Palit, G. Frémont, Y. H. Kim, S. Biswas, P. Désesquelles, R. M. Pérez-Vidal, M. Zielińska, Soumik Bhattacharya, A. Navin, Enrique Sanchis, F. Saillant, W. Korten, B. Million, J. Ropert, Begoña Quintana, J. Ljungvall, L. Ménager, Eric Clément, F. Recchia, A. Maj, M. Labiche, P. Reiter, and C. Domingo-Pardo

Subjects
Physics, Angular momentum, Valence (chemistry), Isotope, 010308 nuclear & particles physics, Fission, Nuclear Theory, Nuclear structure, 7. Clean energy, 01 natural sciences, Neutron number, 0103 physical sciences, AGATA, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

Background: Levels fulfilling the seniority scheme and relevant isomers are commonly observed features in semimagic nuclei; for example, in Sn isotopes (Z=50). Seniority isomers in Sn, with dominantly pure neutron configurations, directly probe the underlying neutron-neutron (νν) interaction. Furthermore, an addition of a valence proton particle or hole, through neutron-proton (νπ) interaction, affects the neutron seniority as well as the angular momentum. Purpose: Benchmark the reproducibility of the experimental observables, like the excitation energies (EX) and the reduced electric-quadrupole transition probabilities [B(E2)], with the results obtained from shell-model interactions for neutron-rich Sn and Sb isotopes with N

Published
2019

19. Identification of high-spin proton configurations in Ba136 and Ba137

Author

C. Fransen, C. Müller-Gatermann, D. Bazzacco, B. Birkenbach, R. Hetzenegger, C. A. Ur, F. Recchia, R. Hirsch, L. Lewandowski, L. Corradi, Katarzyna Hadynska-Klek, M. Seidlitz, P. R. John, P. Reiter, D. Mengoni, L. Kaya, J. J. Valiente-Dobón, A. Vogt, L. Coraggio, G. Pollarolo, D. Rosiak, W. Korten, E. Sahin, N. Saed-Samii, A. Blazhev, A. Giaz, C. Michelagnoli, A. Jungclaus, E. Farnea, O. Stezowski, A. Gottardo, K. Arnswald, B. Bruyneel, B. Szpak, Nunzio Itaco, Zs. Podolyák, Andreas Görgen, R. Menegazzo, F. Scarlassara, M. Droste, A. M. Stefanini, A. Gargano, J. Jolie, T. Mijatović, M. Weinert, Suzana Szilner, A. Gadea, K. O. Zell, P. A. Söderström, D. R. Napoli, K. Wolf, M. Siciliano, G. Montagnoli, F. C. L. Crespi, S. Lunardi, E. Fioretto, D. Montanari, Hans-Jurgen E. Hess, G. de Angelis, A. Bracco, J. Eberth, and S. Leoni

Subjects
Physics, Proton, Spins, Isotope, 010308 nuclear & particles physics, Nuclear structure, 01 natural sciences, 7. Clean energy, 0103 physical sciences, AGATA, Atomic physics, 010306 general physics, Spin (physics), Spectroscopy, Excitation
Abstract

The high-spin structures of 136Ba and 137Ba are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. 136Ba is populated in a 136Xe+238U MNT reaction employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and in two 9Be + 130Te fusion-evaporation reactions using the High-efficiency Observatory for -Ray Unique Spectroscopy (HORUS) at the FN tandem accelerator of the University of Cologne, Germany. Furthermore, both isotopes are populated in an elusive reaction channel in the 11B+130Te fusion-evaporation reaction utilizing the HORUS -ray array. The level scheme above the J� = 10+ isomer in 136Ba is revised and extended up to an excitation energy of approx. 5.5 MeV. From the results of angular-correlation measurements, the Ex = 3707- and Ex = 4920-keV states are identified as the bandheads of positive- and negative-parity cascades. While the high-spin regimes of both 132Te and 134Xe are characterized by high-energy 12+ ! 10+ transitions, the 136Ba E2 ground-state band is interrupted by negativeparity states only a few hundred keV above the J� = 10+ isomer. Furthermore, spins are established for several hitherto unassigned high-spin states in 137Ba. The new results close a gap along the highspin structure of N < 82 Ba isotopes. Experimental results are compared to large-scale shell-model calculations employing the GCN50:82, Realistic SM, PQM130 and SN100PN interactions. The calculations suggest that the bandheads of the positive-parity bands in both isotopes are predominantly of proton character.

Published
2019

20. Millisecond 23/2+ isomers in the N=79 isotones Xe133 and Ba135

Author

W. Korten, K. O. Zell, A. Vogt, S. Leoni, D. Bazzacco, Nunzio Itaco, F. Recchia, Andreas Görgen, R. Hirsch, Zs. Podolyák, B. Birkenbach, B. Szpak, P. R. John, J. J. Valiente-Dobón, Suzana Szilner, L. Lewandowski, C. Fransen, D. Mengoni, P. A. Söderström, P. Reiter, R. Menegazzo, J. Jolie, G. Pollarolo, E. Fioretto, A. Giaz, E. Farnea, L. Corradi, A. Gottardo, C. A. Ur, L. Kaya, A. Jungclaus, A. Gargano, K. Hadynska-Klek, M. Seidlitz, D. R. Napoli, E. Sahin, K. Wolf, M. Weinert, R. Hetzenegger, J. Eberth, L. Coraggio, S. Lunardi, Hans-Jurgen E. Hess, A. Bracco, C. Müller-Gatermann, D. Montanari, O. Stezowski, G. de Angelis, G. Montagnoli, D. Rosiak, F. C. L. Crespi, M. Siciliano, C. Michelagnoli, M. Droste, A. M. Stefanini, N. Saed-Samii, A. Blazhev, K. Arnswald, B. Bruyneel, F. Scarlassara, T. Mijatović, and A. Gadea

Subjects
Physics, Millisecond, Spectrometer, 010308 nuclear & particles physics, Nuclear structure, Nuclear shell model, Parity (physics), 01 natural sciences, Nuclear physics, 0103 physical sciences, AGATA, 010306 general physics, Spectroscopy, Excitation
Abstract

Detailed information on isomeric states in A ≈ 135 nuclei is exploited to benchmark shell-model calculations in the region northwest of doubly-magic nucleus 132Sn. The N = 79 isotones 133Xe and 135Ba are studied after multinucleon transfer (MNT) in the 136Xe + 208Pb reaction employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy and in a pulsed-beam experiment at the FN tandem accelerator of the University of Cologne, Germany utilizing a 9Be+130Te fusion-evaporation reaction at a beam energy of 40 MeV. Isomeric states are identified via delayed γ-ray spectroscopy. Hitherto tentative excitation energy, spin, and parity assignments of the 2107-keV Jπ = 23/2+ isomer in 133Xe are confirmed and a half-life of T1/2 = 8.64(13) ms is measured. The 2388-keV state in 135Ba is identified as a Jπ = 23/2+ isomer with a half-life of 1.06(4) ms. The new results show a smooth onset of isomeric Jπ = 23/2+ states along the N = 79 isotones and close a gap in the high-spin systematics towards the recently investigated Jπ = 23/2+ isomer in 139Nd. The resulting systematics of M2 reduced transition probabilities is discussed within the framework of the nuclear shell model. Latest large-scale shell-model calculations employing the SN100PN, GCN50:82, SN100-KTH, and a realistic effective interaction reproduce the experimental findings generally well and give insight into the structure of the isomers.

Published
2018

21. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni78 Region: A Hint from Lifetime Measurements

Author

C. Delafosse, D. Verney, P. Marević, A. Gottardo, C. Michelagnoli, A. Lemasson, A. Goasduff, J. Ljungvall, E. Clément, A. Korichi, G. De Angelis, C. Andreoiu, M. Babo, A. Boso, F. Didierjean, J. Dudouet, S. Franchoo, A. Gadea, G. Georgiev, F. Ibrahim, B. Jacquot, T. Konstantinopoulos, S. M. Lenzi, G. Maquart, I. Matea, D. Mengoni, D. R. Napoli, T. Nikšić, L. Olivier, R. M. Pérez-Vidal, C. Portail, F. Recchia, N. Redon, M. Siciliano, I. Stefan, O. Stezowski, D. Vretenar, M. Zielinska, D. Barrientos, G. Benzoni, B. Birkenbach, A. J. Boston, H. C. Boston, B. Cederwall, L. Charles, M. Ciemala, J. Collado, D. M. Cullen, P. Désesquelles, G. de France, C. Domingo-Pardo, J. Eberth, V. González, L. J. Harkness-Brennan, H. Hess, D. S. Judson, A. Jungclaus, W. Korten, A. Lefevre, F. Legruel, R. Menegazzo, B. Million, J. Nyberg, B. Quintana, D. Ralet, P. Reiter, F. Saillant, E. Sanchis, Ch. Theisen, and J. J. Valiente Dobon

Subjects
Physics, Valence (chemistry), Proton, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Particle identification, Recoil, Excited state, 0103 physical sciences, Quadrupole, Neutron, AGATA, Atomic physics, 010306 general physics
Abstract

Lifetime measurements of excited states of the light N = 52 isotones 88 Kr , 86 Se , and 84 Ge have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B ( E 2 ; 2 + → 0 + ) and B ( E 2 ; 4 + → 2 + ) were obtained for the first time for the hard-to-reach 84 Ge . While the B ( E 2 ; 2 + → 0 + ) values of 88 Kr , 86 Se saturate the maximum quadrupole collectivity offered by the natural valence ( 3 s , 2 d , 1 g 7 / 2 , 1 h 11 / 2 ) space of an inert 78 Ni core, the value obtained for 84 Ge largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N ≲ 49 , extend beyond N = 50 . The onset of collectivity at Z = 32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector ρ field in shell-structure evolution.

Published
2018

22. Fission and Quasi-Fission Dynamics Near the Coulomb Barrier: $\gamma$ Rays as Probe for their Timescale

Author

I. M. Itkis, C. Petrone, I. M. Harca, N. I. Kozulina, J. Wilson, P. K. Rath, A. Pulcini, B. de Canditiis, G. Sposito, O. Dorvaux, E. M. Kozulin, D. Quero, O. Stezowski, Wladyslaw Henryk Trzaska, C. Schmitt, I. V. Kolesov, A. Di Nitto, S. Calinescu, G. La Rana, F. Davide, S. Brambilla, E. Saveleva, F. Camera, M. Ashaduzzaman, V. V. Kirakosyan, A. Bracco, M. Ciemala, G. N. Knyazheva, S. N. Dmitriev, K. V. Novikov, Emanuele Vardaci, I. Matea, C. Borcea, A. Maj, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (INFN, Sezione di Napoli), Istituto Nazionale di Fisica Nucleare (INFN), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Penionzhkevich, Yu E, Yu G Sobolev, Pulcini, A., Vardaci, E., Kozulin, E. M., Ashaduzzaman, M., Borcea, C., Bracco, A., Brambilla, S., Calinescu, S., Camera, F., Ciemala, M., Davide, F., de Canditiis, B., Di Nitto, A., Dmitriev, S., Dorvaux, O., Harca, I. M., Itkis, I. M., Kirakosyan, V. V., Knyazheva, G., Kozulina, N., Kolesov, I. V., La Rana, G., Maj, A., Matea, I., Novikov, K., Petrone, C., Quero, D., Rath, P. K., Saveleva, E., Schmitt, C., Sposito, G., Stezowski, O., Trzaska, W. H., Wilson, J., Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Fission, Experiment-Nucl, Dynamics (mechanics), Theory-Nucl, Coulomb barrier, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The overlap in the mass symmetric region of the reaction products from fusion-fission and quasi-fission complicates the assignment of symmetric events to complete fusion on the basis of the mass distribution alone. Additional observables, besides mass distribution, should be used. The method proposed here relies on the fact that fusion-fission and quasifission are characterized by a different timescale. Within this framework we performed a detailed study to find out if timescales can be probed via angular momentum as measured via γ rays multiplicity. The proof of principle was carried out by measuring the γ rays in coincidence with two fragments in the reaction 32S + 197Au at beam energy near the Coulomb barrier. The experiment has been performed at the Tandem ALTO facility at IPN Orsay using a detection setup consisting of ORGAM and PARIS γ detector arrays coupled with the CORSET time-of-flight spectrometer. Preliminary results on the sensitivity of this method to distinguish reaction channels with different dynamics are discusses.

Published
2018

23. Lifetime Measurements Using RDDS Method in the Vicinity of $^{78}$Ni

Author

S. M. Lenzi, F. Didierjean, D. Mengoni, G. Maquart, A. Goasduff, Georgi P. Georgiev, D. Verney, C. Michelagnoli, M. Babo, A. Gadea, A. Korichi, O. Stezowski, D. R. Napoli, Bertrand Jacquot, J. Ljungvall, J Dudouet, S. Franchoo, Emyr Clement, T. Konstantinopoulos, L. Olivier, R. M. Perez-Vidal, Corina Andreoiu, A. Boso, A. Gottardo, F. Ibrahim, A. Lemasson, C. Portail, C. Delafosse, F. Recchia, I. Matea, M. Zielińska, N. Redon, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Particle identification, Nuclear physics, symbols.namesake, Recoil, 0103 physical sciences, Quadrupole, symbols, AGATA, 010306 general physics, Doppler effect
Abstract

International audience; Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich N = 52 isotones 88Kr and 86Se were investigated with a recoil distance Doppler shift (RDDS) experiment. The experiment was performed at GANIL (Caen, France) using the Orsay Universal Plunger System (OUPS) for the RDDS technique and the AGATA array for the γ-ray detection coupled to the VAMOS++ magnetic spectrometer for an event-by-event particle identification. In 88Kr, the lifetimes of seven levels were determined and in 86Se, the lifetimes of five levels were determined. The deduced B(E2; 2+ 1 → 0 + 1 ) are compared with mean-field and shellmodel calculations.

Published
2018

24. The New Neutron Multiplicity Filter NEDA and Its First Physics Campaign with AGATA

Author

G. Jaworski, A. Goasduff, F.J. Egea Canet, V. Modamio, T. Hüyük, A. Triossi, M. Jastrząb, P.-A. Söderström, S.M. Carturan, A. Di Nitto, G. de Angelis, G. De France, N. Erduran, A. Gadea, M. Moszyński, J. Nyberg, M. Palacz, J. Valiente, R. Wadsworth, R. Aliaga, C. Aufranc, M. Bézard, G. Beaulieu, P. Bednarczyk, E. Bisiato, A. Boujrad, I. Burrows, E. Clément, P. Cocconi, G. Colucci, D. Conventi, M. Cordwell, S. Coudert, J.M. Deltoro, L. Ducroux, T. Dupasquier, S. Ertürk, X. Fabian, V. González, A. Gottardo, A. Grant, K. Hadyńska-Klęk, A. Illana, M.L. Jurado-Gomez, M. Kogimtzis, I. Lazarus, L. Legeard, J. Ljungvall, A. Maj, G. Pasqualato, R.M. Pérez-Vidal, A. Raggio, D. Ralet, N. Redon, F. Saillant, E. Sanchis, B. Sayğı, M. Scarcioffolo, M. Siciliano, O. Stezowski, D. Testov, M. Tripon, I. Zanon, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ege Üniversitesi, Jaworski, G., Goasduff, A., Egea Canet, F. J., Modamio, V., Hüyük, T., Triossi, A., Jastrząb, M., Söderström, P. -A., Carturan, S. M., Di Nitto, A., De Angelis, G., De France, G., Erduran, N., Gadea, A., Moszyński, M., Nyberg, J., Palacz, M., Valiente, J., Wadsworth, R., Aliaga, R., Aufranc, C., Bézard, M., Beaulieu, G., Bednarczyk, P., Bisiato, E., Boujrad, A., Burrows, I., Clément, E., Cocconi, P., Colucci, G., Conventi, D., Cordwell, M., Coudert, S., Deltoro, J. M., Ducroux, L., Dupasquier, T., Ertürk, S., Fabian, X., González, V., Gottardo, A., Grant, A., Hadyńska-Klęk, K., Illana, A., Jurado-Gomez, M. L., Kogimtzis, M., Lazarus, I., Legeard, L., Ljungvall, J., Maj, A., Pasqualato, G., Pérez-Vidal, R. M., Raggio, A., Ralet, D., Redon, N., Saillant, F., Sanchis, E., Sayğı, B., Scarcioffolo, M., Siciliano, M., Stezowski, O., Testov, D., Tripon, M., Zanon, I., Jaworski, G., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy, Heavy Ion Laboratory, University of Warsaw, Warszawa, Poland -- Goasduff, A., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy, Department of Physics and Astronomy, University of Padua, Padua, Italy, INFN, Division of Padua, Padua, Italy -- Egea Canet, F.J., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy, Department of Physics and Astronomy, University of Padua, Padua, Italy, INFN, Division of Padua, Padua, Italy, IFIC, CSIC University of Valencia, Paterna, Spain -- Modamio, V., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy, Department of Physics, University of Oslo, Oslo, Norway -- Hüyük, T., IFIC, CSIC University of Valencia, Paterna, Spain -- Triossi, A., Department of Physics and Astronomy, University of Padua, Padua, Italy, INFN, Division of Padua, Padua, Italy, CERN, Switzerland -- Jastrzab, M., Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland -- Söderström, P.-A., Extreme Light Infrastructure–Nucl. Phys. (ELI–NP), Bucharest, Romania -- Carturan, S.M., Department of Physics and Astronomy, University of Padua, Padua, Italy, INFN, Division of Padua, Padua, Italy -- Di Nitto, A., Helmholtz Institute Mainz and GSI, Darmstadt, Germany -- De Angelis, G., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- De France, G., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Erduran, N., Fac. of Eng. and Natural Sciences, Istanbul Zaim University, Istanbul, Turkey -- Gadea, A., IFIC, CSIC University of Valencia, Paterna, Spain -- Moszynski, M., National Centre for Nuclear Research, Otwock-Swierk, Poland -- Nyberg, J., Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden -- Palacz, M., Heavy Ion Laboratory, University of Warsaw, Warszawa, Poland -- Valiente, J., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- Wadsworth, R., Department of Physics, University of York, Heslington, York, United Kingdom -- Aliaga, R., IFIC, CSIC University of Valencia, Paterna, Spain -- Aufranc, C., University of Lyon, CNRS, IN2P3, IPN Lyon, Villeurbanne, France -- Bézard, M., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Beaulieu, G., University of Lyon, CNRS, IN2P3, IPN Lyon, Villeurbanne, France -- Bednarczyk, P., Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland -- Bisiato, E., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- Boujrad, A., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Burrows, I. -- Clément, E., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Cocconi, P., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- Colucci, G., Department of Physics and Astronomy, University of Padua, Padua, Italy, INFN, Division of Padua, Padua, Italy -- Conventi, D., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- Cordwell, M. -- Coudert, S., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Deltoro, J.M., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- Ducroux, L., University of Lyon, CNRS, IN2P3, IPN Lyon, Villeurbanne, France -- Dupasquier, T., University of Lyon, CNRS, IN2P3, IPN Lyon, Villeurbanne, France -- Ertürk, S., Department of Physics, Nigde Omer Halisdemir University, Nigde, Turkey -- Fabian, X., University of Lyon, CNRS, IN2P3, IPN Lyon, Villeurbanne, France -- González, V., Department of Electric Engineering, University of Valencia, Burjassot, Spain -- Gottardo, A., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- Grant, A. -- Hadynska-Klek, K., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy, Department of Physics, University of Surrey, Guildford, United Kingdom -- Illana, A., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- Jurado-Gomez, M.L., IFIC, CSIC University of Valencia, Paterna, Spain -- Kogimtzis, M., qTFC Daresbury Laboratory, Daresbury, Warrington, United Kingdom -- Lazarus, I., qTFC Daresbury Laboratory, Daresbury, Warrington, United Kingdom -- Legeard, L., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Ljungvall, J., CSNSM, CNRS, IN2P3, University Paris-Sud, Orsay, France -- Maj, A., Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland -- Pasqualato, G., Department of Physics and Astronomy, University of Padua, Padua, Italy, INFN, Division of Padua, Padua, Italy -- Pérez-Vidal, R.M., IFIC, CSIC University of Valencia, Paterna, Spain -- Raggio, A., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy, Department of Physics and Astronomy, University of Padua, Padua, Italy -- Ralet, D., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Redon, N., University of Lyon, CNRS, IN2P3, IPN Lyon, Villeurbanne, France -- Saillant, F., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Sanchis, E., Department of Electric Engineering, University of Valencia, Burjassot, Spain -- Sayğı, B., Ege University, Physics Department, Izmir, Turkey -- Scarcioffolo, M., INFN, Division of Padua, Padua, Italy -- Siciliano, M., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy -- Stezowski, O., University of Lyon, CNRS, IN2P3, IPN Lyon, Villeurbanne, France -- Testov, D., Department of Physics and Astronomy, University of Padua, Padua, Italy, INFN, Division of Padua, Padua, Italy -- Tripon, M., GANIL, CEA/DSAM and CNRS/IN2P3, Caen, France -- Zanon, I., Legnaro National Laboratories (LNL), INFN, Legnaro, Italy, and 0-Belirlenecek

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Neutron multiplicity, 01 natural sciences, 7. Clean energy, 0-Belirlenecek, Physics and Astronomy (all), Optics, Filter (video), 0103 physical sciences, AGATA, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, business, Nuclear Experiment
Abstract

Zakopane Conference on Nuclear Physics - Extremes of the Nuclear Landscape -- AUG 26-SEP 02, 2018 -- Zakopane, POLAND, WOS: 000463866500047, A new neutron multiplicity filter NEDA, after a decade of design, R&D and construction, was employed in its first physics campaign with the AGATA spectrometer. Properties and performance of the array are discussed., Swedish Research CouncilSwedish Research Council [VR 2014-6644]; Scientific and Technological Research Council of Turkey (TUBITAK project)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [117F114, 114F473]; National Science Centre, Poland (NCN) [2017/25/B/ST2/01569, 2016/22/M/ST2/00269, 2014/14/M/ST2/00738, 2013/08/M/ST2/00257]; UK STFCScience & Technology Facilities Council (STFC) [ST/J000124/1, ST/L005727/1, STL005735/1, ST/P003885/1]; Generalitat Valenciana, SpainGeneralitat Valenciana; MICIU, Spain [PROM-ETEO II/2014/019, FPA2017-84756-C4, SEV-2014-0398]; E.C. FEDER fundsEuropean Union (EU), This study was supported by the Swedish Research Council (contract number VR 2014-6644), the Scientific and Technological Research Council of Turkey (TUBITAK project Nos. 117F114 and 114F473), the National Science Centre, Poland (NCN) (grants Nos. 2017/25/B/ST2/01569, 2016/22/M/ST2/00269, 2014/14/M/ST2/00738 and 2013/08/M/ST2/00257) the UK STFC under grant Nos. ST/J000124/1, ST/L005727/1, STL005735/1, ST/P003885/1, the Generalitat Valenciana and MICIU, Spain, grants PROM-ETEO II/2014/019, FPA2017-84756-C4, Severo Ochoa SEV-2014-0398 and by the E.C. FEDER funds.1

Published
2018

25. High-spin structure in the transitional nucleus Xe131 : Competitive neutron and proton alignment in the vicinity of the N=82 shell closure

Author

Naotaka Yoshinaga, W. Korten, A. Bracco, E. Fioretto, Agnese Giaz, Koji Higashiyama, C. A. Ur, F. Recchia, A. Vogt, S. Lunardi, J. Jolie, B. Birkenbach, R. Hirsch, D. Montanari, A. Jungclaus, G. Montagnoli, Suzana Szilner, K. Arnswald, O. Stezowski, B. Bruyneel, G. de Angelis, P. Reiter, F. C. L. Crespi, P. R. John, S. Leoni, B. Fu, T. Steinbach, B. Szpak, E. Farnea, L. Coraggio, A. Gargano, N. Saed-Samii, A. Blazhev, A. Gadea, Roberto Menegazzo, D. Mengoni, M. Siciliano, D. Bazzacco, E. Teruya, M. Queiser, D. Schneiders, Andreas Görgen, A. Gottardo, Fernando Scarlassara, L. Lewandowski, C. Michelagnoli, J. F. Smith, G. Pollarolo, K. Hadynska-Klek, M. Seidlitz, Tea Mijatović, B. Siebeck, J. J. Valiente-Dobón, J. Eberth, C. Müller-Gatermann, E. Sahin, K. O. Zell, D. R. Napoli, K. Wolf, Alberto Pullia, A. M. Stefanini, R. Hetzenegger, P. A. Söderström, D. Rosiak, Nunzio Itaco, Herbert Hess, Zs. Podolyák, C. Fransen, L. Corradi, and L. Kaya

Subjects
Physics, Spectrometer, Isotope, Proton, 010308 nuclear & particles physics, Shell (structure), Nuclear structure, Spin structure, 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron, AGATA, 010306 general physics
Abstract

The transitional nucleus 131Xe is investigated after multinucleon transfer (MNT) in the 136Xe+208Pb and 136Xe+238U reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy and as an elusive reaction product in the fusion-evaporation reaction 124Sn(11B,p3n) 131Xe employing the HORUS γ-ray array coupled to a double-sided silicon strip detector (DSSSD) at the University of Cologne, Germany. The level scheme of 131Xe is extended to 5 MeV. A pronounced backbending is observed at ~ω ≈ 0.4 MeV along the negative-parity one-quasiparticle νh11/2(α = −1/2) band. The results are compared to the high-spin systematics of the Z = 54 isotopes and the N = 77 isotones. Large-scale shell-model calculations (LSSM) employing the PQM130, SN100PN, GCN50:82, SN100-KTH and a realistic effective interaction reproduce the experimental findings and provide guidance to elucidate the structure of the high-spin states. Further calculations in 129−132Xe provide insight into the changing nuclear structure along the Xe chain towards the N = 82 shell closure. Proton occupancy in the π 0h11/2 orbital is found to be decisive for the description of the observed backbending phenomenon.

Published
2018

26. Quadrupole collectivity in Ca42 from low-energy Coulomb excitation with AGATA

Author

D. Mengoni, M. Kisieliński, G. Anil Kumar, M. Kicińska-Habior, D. Karpiński, G. Lehaut, S. F. Özmen, A. Colombo, F. Recchia, R. Menegazzo, J. Iwanicki, F. Azaiez, B. Million, J. Eberth, D. M. Cullen, N. Toniolo, G. Maron, G. de Angelis, M. Krzysiek, O. Stezowski, P. Reiter, B. Birkenbach, D. T. Doherty, M. D. Salsac, P. J. Coleman-Smith, M. Kowalczyk, M. Gulmini, B. Bounthong, J. Srebrny, S. Franchoo, Hans-Jurgen E. Hess, K. Rusek, M. Ciemala, A. Obertelli, J. L. Wood, S. Leoni, H. Naïdja, C. Michelagnoli, A. Giaz, D. Bazzacco, G. Benzoni, J. Styczen, A. Gottardo, L. Berti, R. Wadsworth, E. Farnea, W. Korten, M. Komorowska, F. C. L. Crespi, Ch. Theisen, M. Kmiecik, A. Jungclaus, Megumi Niikura, D. S. Judson, K. Mazurek, S. Brambilla, B. Dulny, T. Abraham, Joël Chavas, Roberto Isocrate, F. Camera, Tomás R. Rodríguez, P. Bednarczyk, I. Stefan, A. Czermak, L. Charles, G. Jaworski, P. Désesquelles, M. Zieblinski, B. Bruyneel, B. Fornal, X. Grave, S. Lunardi, J. Grebosz, N. Kondratyev, Andreas Görgen, K. Wrzosek-Lipska, G. Rampazzo, Pär-Anders Söderström, Marco Bellato, E. Merchan, Andreas Wiens, Alessandra Corsi, T. Habermann, L. Próchniak, P. J. Napiorkowski, M. Zielińska, A. Lopez-Martens, C. A. Ur, B. Wasilewska, K. Hadynska-Klek, Begoña Quintana, D. Rosso, J. Ljungvall, E. Sahin, A. Gadea, A. Korichi, A. Maj, F. Nowacki, P. Cocconi, Alberto Pullia, Bo Cederwall, N. Karkour, Damiano Bortolato, J. J. Valiente Dobon, D. R. Napoli, W. Meczynski, N. Redon, S. Myalski, and M. Palacz

Subjects
Physics, Sideband, 010308 nuclear & particles physics, Coulomb excitation, 01 natural sciences, Matrix (mathematics), Excited state, 0103 physical sciences, Quadrupole, AGATA, Sum rule in quantum mechanics, Atomic physics, 010306 general physics, Beam (structure)
Abstract

A Coulomb-excitation experiment to study electromagnetic properties of Ca42 was performed using a 170-MeV calcium beam from the TANDEM XPU facility at INFN Laboratori Nazionali di Legnaro. γ rays from excited states in Ca42 were measured with the AGATA spectrometer. The magnitudes and relative signs of ten E2 matrix elements coupling six low-lying states in Ca42, including the diagonal E2 matrix elements of 21+ and 22+ states, were determined using the least-squares code gosia. The obtained set of reduced E2 matrix elements was analyzed using the quadrupole sum rule method and yielded overall quadrupole deformation for 01,2+ and 21,2+ states, as well as triaxiality for 01,2+ states, establishing the coexistence of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in Ca42. The experimental results were compared with the state-of-the-art large-scale shell-model and beyond-mean-field calculations, which reproduce well the general picture of shape coexistence in Ca42.

Published
2018

27. Gamma rays as probe of fission and quasi-fission dynamics in the reaction 32S + 197Au near the Coulomb barrier

Author

A. Bracco, E. M. Kozulin, B. de Canditiis, Wladyslaw Henryk Trzaska, I. M. Itkis, C. Petrone, Emanuele Vardaci, V. V. Kirakosyan, P. K. Rath, I. M. Harca, I. Matea, G. Sposito, S. Calinescu, O. Stezowski, C. Schmitt, A. Pulcini, D. Quero, James R. Wilson, N. I. Kozulina, G. La Rana, E. Saveleva, G. N. Knyazheva, K. V. Novikov, S. Brambilla, F. Camera, I. V. Kolesov, M. Ciemala, M. Ashaduzzaman, O. Dorvaux, C. Borcea, A. Maj, Giuseppe Mandaglio, Antonio Trifirò, Marina Trimarchi, Pulcini, A., Vardaci, E., Kozulin, E., Ashaduzzaman, M., Borcea, C., Bracco, A., Brambilla, S., Calinescu, S., Camera, F., Ciemala, M., De Canditiis, Bartolomeo, Dorvaux, O., Harca, I. M., Itkis, I., Kirakosyan, V. V., Knyazheva, G., Kozulina, N., Kolesov, I. V., La Rana, G., Maj, A., Matea, I., Novikov, K., Petrone, C., Quero, D., Rath, P., Saveleva, E., Schmitt, C., Sposito, G., Stezowski, O., Trzaska, W. H., Wilson, J., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Mandaglio, Giuseppe, Trifirò, Antonio, and Trimarchi, Marina

Subjects
Physics, History, Angular momentum, Spectrometer, 010308 nuclear & particles physics, Fission, Detector, gamma radiation, Gamma ray, Coulomb barrier, gammasäteily, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Computer Science Applications, Education, Nuclear physics, nuclear fission, fissio, nuclear physics, 0103 physical sciences, Multiplicity (chemistry), 010306 general physics, ydinfysiikka, Nuclear Experiment
Abstract

International audience; Compound nucleus fission and quasi-fission are both binary decay channels whose common properties make the experimental separation between them difficult. A way to achieve this separation could be to probe the angular momentum of the binary fragments. This can be done detecting gamma rays in coincidence with the two fragments. As a case study, the reaction 32S + 197Au near the Coulomb barrier has been performed at the Tandem ALTO facility at IPN ORSAY. ORGAM and PARIS, two different gamma detectors arrays, are coupled with the CORSET detector, a two-arm time-of-flight spectrometer. TOF-TOF data were analyzed to reconstruct the mass-energy distribution of the primary fragments coupled with gamma multiplicity and spectroscopic analysis. Preliminary results of will be shown.

Published
2018

28. Study of isomeric states in $^{198,200,202,206}$Pb and $^{206}$Hg populated in fragmentation reactions

Author

A. Gottardo, P. Thöle, D. Bazzacco, R. Menegazzo, Dirk Rudolph, Jan Taprogge, E. Wilson, I. Burrows, C. Domingo-Pardo, Pavel Golubev, Claes Fahlander, D. Mengoni, H. J. Wollersheim, A. Pullia, K. Moschner, Herbert Hess, A. Jungclaus, Luis Sarmiento, Vicente González, P. Reiter, J. Eberth, C. Michelagnoli, O. Wieland, Begoña Quintana, F. Ameil, Eric Clément, Th Moeller, Zs. Podolyák, J. Simpson, A. Gadea, Anna Wendt, M. Reese, P. Désesquelles, T. Arici, M. Hackstein, B. Bruyneel, T. Habermann, I. Kojouharov, D. Ralet, E. Gregor, Zena Patel, C. Lizarazo, C. Louchart, Pushpendra Singh, A. Givechev, R. Stegmann, M. L. Cortés, O. Stezowski, J. J. Valiente Dobon, N. Kurz, M. Górska, C. Bauer, N. Lalović, T. Alexander, E. Merchan, Enrique Sanchis, N. Goel, Edward Simpson, J. Gerl, Jnaneswari Gellanki, Norbert Pietralla, M. Bowry, C. Stahl, M. Lettmann, D. R. Napoli, R. Kumar, G. Rainovski, G. Guastalla, J. Jolie, S. Pietri, B. Birkenbach, M. D. Salsac, M. A. Bentley, D. S. Judson, H. Schaffner, P. Boutachkov, P. H. Regan, R. Wood, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AGATA, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, isomeric decays, Astrophysics::High Energy Astrophysical Phenomena, Population, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Fragmentation (mass spectrometry), Subatomic Physics, 0103 physical sciences, Gamma spectroscopy, Gamma-ray spectroscopy, 010306 general physics, education, Nuclear Experiment, Physics, education.field_of_study, Isotope, 010308 nuclear & particles physics, Nuclear shell model, direct reactions, relativistic projectile fragmentation, electromagnetic transitions, nuclear shell model, AGATA, PreSPEC-AGATA, Atomic physics, Beam (structure)
Abstract

International audience; Isomeric states in isotopes in the vicinity of doubly-magic 208Pb were populatedfollowing reactions of a relativistic 208Pb primary beam impinging on a9Be fragmentation target. Secondary beams of 198,200,202,206Pb and 206Hg wereisotopically separated and implanted in a passive stopper positioned in thefocal plane of the GSI Fragment Separator. Delayed γ rays were detected withthe Advanced Gamma Tracking Array (AGATA). Decay schemes were reevaluatedand interpreted with shell-model calculations. The momentumdependentpopulation of isomeric states in the two-nucleon hole nuclei206Pb/206Hg was found to differ from the population of multi neutron-holeisomeric states in 198,200,202Pb.

Published
2018

29. Experimental study of the lifetime and phase transition in neutron-rich Zr98,100,102

Author

O. Stezowski, Tomoaki Togashi, S. Ansari, F. Drouet, N. Saed-Samii, G. S. Simpson, E. Wilson, S. Ilieva, C. A. Ur, W. Korten, V. Paziy, M. D. Salsac, C. Townsley, A. Vancraeyenest, L. M. Fraile, Marcus Scheck, Paolo Mutti, Emyr Clement, B. Olaizola, Henryk Mach, J. Jolie, J.-M. Régis, J. F. Smith, V. Vedia, Oliver J. Roberts, M. Zielińska, Raymond J. Carroll, Zs. Podolyák, W. Urban, Takaharu Otsuka, A. Ignatov, S. Lalkovski, P. H. Regan, N. Marginean, T. Soldner, C. Larijani, Alison Bruce, Yusuke Tsunoda, A.-L. Hartig, T. Kröll, Noritaka Shimizu, Aurelien Blanc, Ulli Köster, N. Warr, and Michael Jentschel

Subjects
Physics, Phase transition, 010308 nuclear & particles physics, Fission, Context (language use), Neutron radiation, 01 natural sciences, 7. Clean energy, Excited state, 0103 physical sciences, Neutron, Atomic physics, Interacting boson model, Nuclear Experiment, 010306 general physics, Line (formation)
Abstract

Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in $N\ensuremath{\le}58$ nuclei are nearly spherical, while those with $N\ensuremath{\ge}60$ have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with ${\mathrm{LaBr}}_{3}$(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region. We used neutron-induced fission of $^{241}\mathrm{Pu}$ and $^{235}\mathrm{U}$ to study lifetimes of excited states in fission fragments in the $A\ensuremath{\sim}100$ region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei $^{98}\mathrm{Zr}$ (N = 58), $^{100}\mathrm{Zr}$, and $^{102}\mathrm{Zr}$ ($N\ensuremath{\ge}60$). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model.

Published
2017

30. High-spin structures in Xe132 and Xe133 and evidence for isomers along the N=79 isotones

Author

V. Karayonchev, E. Teruya, S. Szilner, E. Fioretto, Ching-Yen Wu, T. Mijatović, M. Queiser, N. Saed-Samii, P. Reiter, J. Eberth, A. O. Macchiavelli, S. J. Freeman, W. Gelletly, D. Cline, A. Blazhev, R. Hirsch, R. Teng, Andreas Görgen, A. B. Hayes, J. J. Valiente-Dobón, B. Siebeck, C. J. Pearson, K. Wolf, A. Gadea, Alberto Pullia, B. Birkenbach, Naotaka Yoshinaga, R. S. Chakrawarthy, F. Scarlassara, Agnese Giaz, O. Stezowski, Roberto Menegazzo, J. Jolie, W. Korten, B. Bruyneel, P. A. Söderström, K. Hadynska-Klek, M. Seidlitz, D. Mengoni, A. Gottardo, D. R. Napoli, B. Fu, A. Jungclaus, H. Hua, Robert Chapman, A. M. Stefanini, R. Hetzenegger, S. Lunardi, D. Montanari, E. Farnea, A. Vogt, A. Bracco, C. Wheldon, D. Bazzacco, P. H. Regan, G. Pollarolo, L. Kaya, J.-M. Régis, I. Y. Lee, M. Cromaz, Herbert Hess, C. A. Ur, L. Corradi, C. Michelagnoli, G. de Angelis, K. O. Zell, P. R. John, M. Siciliano, S. Leoni, G. Sletten, F. Recchia, K. Arnswald, G. Montagnoli, Ch. Fransen, C. Müller-Gatermann, Zs. Podolyák, F. C. L. Crespi, D. D. Warner, B. Szpak, J. F. Smith, X. Liang, E. Sahin, and P. Fallon

Subjects
Physics, Crystallography, 010308 nuclear & particles physics, 0103 physical sciences, Gammasphere, AGATA, Atomic physics, 010306 general physics, Spin (physics), 01 natural sciences
Abstract

Author(s): Vogt, A; Siciliano, M; Birkenbach, B; Reiter, P; Hadynska-Klȩk, K; Wheldon, C; Valiente-Dobon, JJ; Teruya, E; Yoshinaga, N; Arnswald, K; Bazzacco, D; Blazhev, A; Bracco, A; Bruyneel, B; Chakrawarthy, RS; Chapman, R; Cline, D; Corradi, L; Crespi, FCL; Cromaz, M; De Angelis, G; Eberth, J; Fallon, P; Farnea, E; Fioretto, E; Fransen, C; Freeman, SJ; Fu, B; Gadea, A; Gelletly, W; Giaz, A; Gorgen, A; Gottardo, A; Hayes, AB; Hess, H; Hetzenegger, R; Hirsch, R; Hua, H; John, PR; Jolie, J; Jungclaus, A; Karayonchev, V; Kaya, L; Korten, W; Lee, IY; Leoni, S; Liang, X; Lunardi, S; MacChiavelli, AO; Menegazzo, R; Mengoni, D; Michelagnoli, C; Mijatovic, T; Montagnoli, G; Montanari, D; Muller-Gatermann, C; Napoli, D; Pearson, CJ; Podolyak, Z; Pollarolo, G; Pullia, A; Queiser, M; Recchia, F; Regan, PH; Regis, JM; Saed-Samii, N; Sahin, E; Scarlassara, F; Seidlitz, M; Siebeck, B; Sletten, G; Smith, JF; Soderstrom, PA; Stefanini, AM; Stezowski, O; Szilner, S; Szpak, B; Teng, R; Ur, C; Warner, DD; Wolf, K; Wu, CY; Zell, KO | Abstract: The transitional nuclei Xe132 and Xe133 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+Pb208 MNT reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (ii) in the Xe136+Pt198 MNT reaction employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO, and (iii) as an evaporation residue after a Te130(α,xn)Xe134-xn fusion-evaporation reaction employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes are considerably extended above the Jπ=(7-) and (10+) isomers in Xe132 and above the 11/2- isomer in Xe133. The results are compared to the high-spin systematics of the Z=54 as well as the N=78 and N=79 chains. Furthermore, evidence is found for a long-lived (T1/2â‰1μs) isomer in Xe133 which closes a gap along the N=79 isotones. Shell-model calculations employing the SN100PN and PQM130 effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features.

Published
2017

31. Erratum: Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing [Phys. Rev. C 95 , 054319 (2017)]

Author

J.-M. Régis, J. Jolie, N. Saed-Samii, N. Warr, M. Pfeiffer, A. Blanc, M. Jentschel, U. Köster, P. Mutti, T. Soldner, G. S. Simpson, F. Drouet, A. Vancraeyenest, G. de France, E. Clément, O. Stezowski, C. A. Ur, W. Urban, P. H. Regan, Zs. Podolyák, C. Larijani, C. Townsley, R. Carroll, E. Wilson, L. M. Fraile, H. Mach, V. Paziy, B. Olaizola, V. Vedia, A. M. Bruce, O. J. Roberts, J. F. Smith, M. Scheck, T. Kröll, A.-L. Hartig, A. Ignatov, S. Ilieva, S. Lalkovski, W. Korten, N. Mărginean, T. Otsuka, N. Shimizu, T. Togashi, and Y. Tsunoda

Subjects
Physics, Neutron number, Atomic physics
Published
2017

32. Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing

Author

J.-M. Régis, J. Jolie, N. Saed-Samii, N. Warr, M. Pfeiffer, A. Blanc, M. Jentschel, U. Köster, P. Mutti, T. Soldner, G. S. Simpson, F. Drouet, A. Vancraeyenest, G. de France, E. Clément, O. Stezowski, C. A. Ur, W. Urban, P. H. Regan, Zs. Podolyák, C. Larijani, C. Townsley, R. Carroll, E. Wilson, L. M. Fraile, H. Mach, V. Paziy, B. Olaizola, V. Vedia, A. M. Bruce, O. J. Roberts, J. F. Smith, M. Scheck, T. Kröll, A.-L. Hartig, A. Ignatov, S. Ilieva, S. Lalkovski, W. Korten, N. Mărginean, T. Otsuka, N. Shimizu, T. Togashi, and Y. Tsunoda

Subjects
Physics, Fission products, Proton, Isotope, 010308 nuclear & particles physics, Fission, Yrast, Nuclear Theory, Monte Carlo method, 7. Clean energy, 01 natural sciences, Nuclear physics, 13. Climate action, Neutron number, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

Lifetimes of low-lying yrast states in neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.

Published
2017

33. EXOGAM at the ILL: the EXILL campaign

Author

G. de France, A. Blanc, F. Drouet, M. Jentschel, U. Köster, P. Mutti, J.M. Régis, G. Simpson, T. Soldner, O. Stezowski, C.A. Ur, W. Urban, A. Vancrayenest, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, History, 010308 nuclear & particles physics, Radiative capture, Nuclear Theory, Measure (physics), chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, Complement (complexity), Nuclear physics, chemistry, 0103 physical sciences, Neutron, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract

International audience; A combination of germanium detectors has been installed at the PF1B neutronguide of the ILL to perform the prompt spectroscopy of neutron-rich nuclei produced in theneutron-capture induced-fission of 235U and 241Pu. Radiative capture reactions on rare targetshave also been performed. LaBr3 detectors from the FATIMA collaboration have also beeninstalled in complement with the EXOGAM clovers to measure lifetimes of low-lying excitedstates. The measured characteristics indicate very good performances of the overall setup. Somerecent results will be discussed.

Published
2017

34. Kr369660 –Low- Z Boundary of the Island of Deformation at N=60

Author

J. Dudouet, A. Lemasson, G. Duchêne, M. Rejmund, E. Clément, C. Michelagnoli, F. Didierjean, A. Korichi, G. Maquart, O. Stezowski, C. Lizarazo, R. M. Pérez-Vidal, C. Andreoiu, G. de Angelis, A. Astier, C. Delafosse, I. Deloncle, Z. Dombradi, G. de France, A. Gadea, A. Gottardo, B. Jacquot, P. Jones, T. Konstantinopoulos, I. Kuti, F. Le Blanc, S. M. Lenzi, G. Li, R. Lozeva, B. Million, D. R. Napoli, A. Navin, C. M. Petrache, N. Pietralla, D. Ralet, M. Ramdhane, N. Redon, C. Schmitt, D. Sohler, D. Verney, D. Barrientos, B. Birkenbach, I. Burrows, L. Charles, J. Collado, D. M. Cullen, P. Désesquelles, C. Domingo Pardo, V. González, L. Harkness-Brennan, H. Hess, D. S. Judson, M. Karolak, W. Korten, M. Labiche, J. Ljungvall, R. Menegazzo, D. Mengoni, A. Pullia, F. Recchia, P. Reiter, M. D. Salsac, E. Sanchis, Ch. Theisen, J. J. Valiente-Dobón, and M. Zielińska

Subjects
Physics, Proton, 010308 nuclear & particles physics, Fission, General Physics and Astronomy, 01 natural sciences, Atomic orbital, Excited state, Neutron number, 0103 physical sciences, Quadrupole, Atomic number, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

Prompt γ-ray spectroscopy of the neutron-rich $^{96}$Kr, produced in transfer- and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS++ spectrometer. A second excited state, assigned to $J^π$ = $4^+$, is observed for the first time, and a previously reported level energy of the first 2+ excited state is confirmed. The measured energy ratio R4/2 = E($4^+$)/E($2^+$) = 2.12(1) indicates that this nucleus does not show a well-developed collectivity contrary to that seen in heavier N = 60 isotones. This new measurement highlights an abrupt transition of the degree of collectivity as a function of the proton number at Z = 36, of similar amplitude to that observed at N = 60 at higher Z values. A possible reason for this abrupt transition could be related to the insufficient proton excitations in the g9/2, d5/2, and s1/2 orbitals to generate strong quadrupole correlations or to the coexistence of competing different shapes. An unexpected continuous decrease of R4/2 as a function of the neutron number up to N = 60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N = 60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N = 60 and Z = 36.

Published
2017

35. Backbending in the pear-shaped Th90223 nucleus: Evidence of a high-spin octupole to quadrupole shape transition in the actinides

Author

M. G. Porquet, Sanna Stolze, Panu Rahkila, Jan Sarén, A. Astier, Paul Greenlees, M. Rousseau, D. Guinet, L. Augey, Panu Ruotsalainen, G. Duchêne, Mikael Sandzelius, A. Lopez-Martens, Paivi Nieminen, D. Curien, Rauno Julin, C. Ducoin, Ulrika Jakobsson, Andrej Herzan, O. Dorvaux, Tuomas Grahn, K. Hauschild, Pauli Peura, Peter B. Jones, F. Azaiez, O. Stezowski, Juha Uusitalo, S. Courtin, G. Maquart, Sami Rinta-Antila, J. Dudouet, Matti Leino, L. Chaix, B. J. P. Gall, A. Vancraeyenest, G. Lehaut, Steffen Ketelhut, N. Redon, Catherine Scholey, I. Deloncle, Juha Sorri, P. Petkov, I. Companis, C. Mancuso, and Sakari Juutinen

Subjects
Physics, Spins, 010308 nuclear & particles physics, Yrast, Nuclear Theory, Actinide, 01 natural sciences, medicine.anatomical_structure, 0103 physical sciences, Quadrupole, medicine, Level structure, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus, Isotopes of thorium, Spin-½
Abstract

Relatively neutron-rich thorium isotopes lie at the heart of a nuclear region of nuclei exhibiting octupole correlation effects. The detailed level structure of Th223 has been investigated in measurements of γ radiation following the fusion-evaporation channel of the Pb208(O18,3n)Th223 reaction at 85 MeV beam energy. The level structure has been extended up to spin 49/2, and 33 new γ rays have been added using triple-γ coincidence data. The spins and parities of the newly observed states have been confirmed by angular distribution ratios. In addition to the two known yrast bands based on a K=5/2 configuration, a non-yrast band has been established up to spin 35/2. We interpret this new structure as based on the same configuration as the yrast band in Th221 having dominant K=1/2 contribution. At the highest spin a backbending occurs around a rotational frequency of ℏω=0.23 MeV, very close to the one predicted in Th222, where a sharp transition to a reflection-symmetric shape is expected.

Published
2017

36. Isomers and high-spin structures in the N=81 isotones Xe135 and Ba137

Author

L. Kaya, M. Siciliano, A. Gengelbach, B. Birkenbach, P. Fallon, Herbert Hess, Agnese Giaz, W. Korten, X. Liang, D. Bazzacco, A. Bracco, Luna Pellegri, V. Vandone, Roberto Menegazzo, S. Lunardi, N. Saed-Samii, B. Bruyneel, M. Bowry, D. Montanari, M. Cromaz, C. Y. Wu, A. Vogt, D. Cline, L. Corradi, P. H. Regan, P. Reiter, A. Blazhev, K. O. Zell, P. R. John, W. Gelletly, K. Arnswald, R. Hirsch, R. Teng, Alberto Pullia, G. Sletten, J. F. Smith, D. Schneiders, E. Sahin, A. Gadea, C. J. Pearson, K. Hadynska-Klek, Robert Chapman, G. Montagnoli, G. Pollarolo, F. Scarlassara, Naotaka Yoshinaga, C. Müller-Gatermann, O. Stezowski, M. Seidlitz, F. Radeck, E. Fioretto, S. Leoni, A. O. Macchiavelli, E. Teruya, T. Mijatović, M. Queiser, G. de Angelis, A. M. Stefanini, J. Eberth, L. Lewandowski, Zs. Podolyák, E. Farnea, A. Gottardo, R. S. Chakrawarthy, D. Rosiak, P. A. Söderström, Andreas Görgen, H. Hua, A. B. Hayes, J. J. Valiente-Dobón, C. Wheldon, D. R. Napoli, K. Geibel, D. Mengoni, B. Fu, J. Jolie, A. Jungclaus, S. Szilner, F. C. L. Crespi, D. D. Warner, S. J. Freeman, T. Steinbach, C. A. Ur, F. Recchia, B. Szpak, Andreas Wiens, I. Y. Lee, C. Michelagnoli, and B. Siebeck

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, 0103 physical sciences, Quadrupole, SHELL model, Gammasphere, AGATA, Atomic physics, 010306 general physics, Spin (physics), 01 natural sciences
Abstract

The high-spin structures of the N = 81 isotones 135Xe and 137Ba are investigated after multinucleontransfer (MNT) and fusion-evaporation reactions. Both nuclei are populated in (i) 136Xe+238U and (ii) 136Xe+208Pb MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii), in the 136Xe+198Pt MNT reaction employing the -ray array GAMMASPHERE in combination with the gas detector array Chico, and (iv) via a 11B+130Te fusion-evaporation reaction. The high-spin level schemes of 135Xe and 137Ba are considerably extended to higher energies. The 2058-keV (19=2 ) state in 135Xe is identified as an isomer, completing the systematics for the N = 81 isotones. Its half-life is measured to be 8.6(10) ns, corresponding to a transition probability of B(E2; 19=2 ! 15=2 ) = 0:539(69) W.u. Latest shell model calculations considering 132Sn as a closed core reproduce the experimental findings and provide guidance to the interpretation of the new levels. The experimentally deduced reduced quadrupole transition probabilities of the isomeric states are compared to shell-model predictions.

Published
2017

37. Measurement of lifetimes in Fe62,64,Co61,63 , and Mn59

Author

M. Klintefjord, J. Ljungvall, A. Görgen, S. M. Lenzi, F. L. Bello Garrote, A. Blazhev, E. Clément, G. de France, J.-P. Delaroche, P. Désesquelles, A. Dewald, D. T. Doherty, C. Fransen, A. Gengelbach, G. Georgiev, M. Girod, A. Goasduff, A. Gottardo, K. Hadyńska-Klȩk, B. Jacquot, T. Konstantinopoulos, A. Korichi, A. Lemasson, J. Libert, A. Lopez-Martens, C. Michelagnoli, A. Navin, J. Nyberg, R. M. Pérez-Vidal, S. Roccia, E. Sahin, I. Stefan, A. E. Stuchbery, M. Zielińska, D. Barrientos, B. Birkenbach, A. Boston, L. Charles, M. Ciemala, J. Dudouet, J. Eberth, A. Gadea, V. González, L. Harkness-Brennan, H. Hess, A. Jungclaus, W. Korten, R. Menegazzo, D. Mengoni, B. Million, A. Pullia, D. Ralet, F. Recchia, P. Reiter, M. D. Salsac, E. Sanchis, O. Stezowski, Ch. Theisen, and J. J. Valiente Dobon

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Creative commons, 010306 general physics, 01 natural sciences, Engineering physics
Abstract

M. Klintefjord et al. -- 11 pags., 8 figs., 1 tab. -- Open Access funded by Creative Commons Atribution Licence 4.0

Published
2017

38. Lifetime measurement of neutron-rich even-even molybdenum isotopes

Author

Torbjörn Bäck, M. Labiche, M. Zielińska, M. Reese, A. Gadea, B. Million, T. Hüyük, F. Camera, R. Knoebel, T. Alexander, E. Gregor, N. Alkhomashi, Maria Doncel, A. Prochazka, A. Atac, D. Mengoni, L. J. Harkness-Brennan, Pushpendra Singh, A. Givechev, A. Gottardo, H. J. Wollersheim, T. Arici, Tomás R. Rodríguez, Alberto Pullia, D. Curien, E. Merchan, L. Sengele, C. Domingo-Pardo, Helmut Weick, A. Jungclaus, Herbert Hess, M. Dewald, P. Thoele, I. Kojouharov, G. Duchêne, S. Pietri, G. de Angelis, F. Didierjean, O. Stezowski, J. S. Winfield, N. Kurz, M. Hackstein, N. Goel, B. Birkenbach, P. Reiter, D. S. Judson, C. Stahl, E. Clément, F. Ameil, Pavel Golubev, P. Boutachkov, M. Górska, B. Bruyneel, A. Korichi, H. Schaffner, C. Scheidenberger, R. Avigo, F. Recchia, T. Goigoux, D. Bazzacco, Bo Cederwall, Vicente González, M. D. Salsac, P. Désesquelles, A. I. Morales, Zs. Podolyák, J. Gerl, J. J. Valiente Dobon, T. Habermann, Dirk Rudolph, Alison Bruce, D. Ralet, Luis Sarmiento, J. Jolie, D. R. Napoli, C. Louchart-Henning, Johan Nyberg, G. Guastalla, B. S. Nara Singh, Enrique Sanchis, M. Alaqeel, Oliver Wieland, G. Rainovski, J. Eberth, Norbert Pietralla, Hans Geissel, F. Ghazi Moradi, Anna Wendt, M. L. Cortés, S. Ceruti, N. Lalović, G. Henning, Begoña Quintana, F. Naqvi, W. Korten, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Swedish Research Council, European Commission, Helmholtz International Center for FAIR, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Subatomic Physics, 0103 physical sciences, Neutron, ddc:530, 010306 general physics, Mass number, Physics, Isotope, 010308 nuclear & particles physics, relativistic projectile fragmentation, 3. Good health, secondary fragmentation, gamma-ray spectroscopy, chemistry, Molybdenum, Excited state, Quadrupole, Física nuclear, AGATA, Atomic physics, Energy (signal processing)
Abstract

D. Ralet et al. -- 11 pags., 10 figs., 3 tabs., Background: In the neutron-rich A≈100 mass region, rapid shape changes as a function of nucleon number as well as coexistence of prolate, oblate, and triaxial shapes are predicted by various theoretical models. Lifetime measurements of excited levels in the molybdenum isotopes allow the determination of transitional quadrupole moments, which in turn provides structural information regarding the predicted shape change. Purpose: The present paper reports on the experimental setup, the method that allowed one to measure the lifetimes of excited states in even-even molybdenum isotopes from mass A=100 up to mass A=108, and the results that were obtained. Method: The isotopes of interest were populated by secondary knock-out reaction of neutron-rich nuclei separated and identified by the GSI fragment separator at relativistic beam energies and detected by the sensitive PreSPEC-AGATA experimental setup. The latter included the Lund-York-Cologne calorimeter for identification, tracking, and velocity measurement of ejectiles, and AGATA, an array of position sensitive segmented HPGe detectors, used to determine the interaction positions of the γ ray enabling a precise Doppler correction. The lifetimes were determined with a relativistic version of the Doppler-shift-attenuation method using the systematic shift of the energy after Doppler correction of a γ-ray transition with a known energy. This relativistic Doppler-shift-attenuation method allowed the determination of mean lifetimes from 2 to 250 ps. Results: Even-even molybdenum isotopes from mass A=100 to A=108 were studied. The decays of the low-lying states in the ground-state band were observed. In particular, two mean lifetimes were measured for the first time: τ=29.7-9.1+11.3 ps for the 4+ state of Mo108 and τ=3.2-0.7+0.7 ps for the 6+ state of Mo102. Conclusions: The reduced transition strengths B(E2), calculated from lifetimes measured in this experiment, compared to beyond-mean-field calculations, indicate a gradual shape transition in the chain of molybdenum isotopes when going from A=100 to A=108 with a maximum reached at N=64. The transition probabilities decrease for Mo108 which may be related to its well-pronounced triaxial shape indicated by the calculations., This work was supported by the BMBF under Grants No. 05P09RDFN4, No. 05P12RDFN8, and No. 05P12PKFNE and by the LOEWE center HIC for FAIR. Part of this work was supported by the P2IO excellence center. This work was also supported by the European Community FP7–Capacities, ENSAR Contract No. 262010, by the Swedish Research Council under Contracts No. 2010-147, No. 2010-3694, No. 2011-5253, No. 2011-6127, and No. 2014-5558, by the IN2P3- GSI No. 02-42 collaboration, by the Science and Technology Facilities Council (STFC) and by MINECO, Spain, under Grant No. FPA2014-57196-C5, and Generalitat Valenciana, Spain, under Grant No. PROMETEOII/2014/019

Published
2017

39. Toward lifetime and g factor measurements of short-lived states in the vicinity of $^{208}$Pb

Author

D Ralet, G Georgiev, A E Stuchbery, E Clément, A Lemasson, C Michelagnoli, M Rejmund, L Atanasova, D L Balabanski, G Bocchi, R Carroll, A Dewald, J Dudouet, B Fornal, G de France, S Franchoo, C Fransen, C Müller-Gatermann, A Goasduff, A Gadea, B Jacquot, P R John, D Kocheva, T Konstantinopoulos, A Korichi, A Kusoglu, S M Lenzi, S Leoni, J Ljungvall, R Lozeva, A Maj, A Navin, R Perez, N Pietralla, C Shand, O Stezowski, D Yordanov, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Institut Pluridisciplinaire Hubert Curien (IPHC), Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, lifetime measurement, Nuclear Theory, g-factor, Nuclear shell model, VAMOS++, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Atomic and Molecular Physics, Excited state, 0103 physical sciences, AGATA, multi-nucleon transfer reaction, Mathematical Physics, and Optics, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

International audience; The multi-nucleon transfer reaction mechanism was used to produce and study nuclei in the vicinity of 208Pb. This mass region is a test case for the nuclear shell model. The mass identification of the fragments was performed with the large acceptance magnetic spectrometer VAMOS++ coupled to the AGATA γ-tracking array. This experiment aimed to determine both lifetimes and gyromagnetic ratios of excited states with the Cologne plunger device. The analysis indicates promising results with the possibility to determine several new lifetimes in this region.

Published
2017

40. Pygmy dipole resonance in 124Sn populated by inelastic scattering of 17O

Author

A. Pullia, J. Eberth, Sunniva Siem, D. R. Napoli, N. Karkour, S. Lunardi, A. Giaz, D. S. Judson, K. Mazurek, Elena Litvinova, A. Gottardo, P. Molini, Roman Gernhäuser, F. Recchia, S. Ceruti, Begoña Quintana, R. Avigo, D. Bazzacco, R. Nicolini, P. Bednarczyk, Roberto Menegazzo, M. Kmiecik, D. Mengoni, A. Bracco, S. Brambilla, P. A. Söderström, L. Charles, M. Zieblinski, P. Désesquelles, A. I. Morales, Marco Bellato, J. Grebosz, G. Benzoni, Luna Pellegri, O. Wieland, B. Birkenbach, J. Simpson, C. Michelagnoli, O. Stezowski, C. A. Ur, Bo Cederwall, S. Leoni, M.D. Salsac, G. de Angelis, A. Maj, E. Farnea, Ch. Theisen, J. J. Valiente Dobon, Roberto Isocrate, C. Boiano, Herbert Hess, M. Krzysiek, F. Camera, M. Ciemala, Andreas Görgen, S. Bottoni, E. G. Lanza, N. Blasi, B. Siebeck, F. C. L. Crespi, A. Gadea, D. Bortolato, P. Reiter, V. Vandone, B. Million, J. Jolie, A. Jungclaus, and SCOAP

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Isoscalar, Gamma ray, Inelastic scattering, 01 natural sciences, 7. Clean energy, Resonance (particle physics), lcsh:QC1-999, Isospin character, Low-lying electric dipole excitations, Ion, Nuclear physics, Dipole, Low-lying electric dipole excitations 124Sn, 0103 physical sciences, AGATA, Atomic physics, 010306 general physics, 124Sn, lcsh:Physics
Abstract

L. Pellegri et al. ; 5 pags. ; 6 figs. ; open access article under the CC BY license. Funded by SCOAP3, © 2014 The Authors. The γ decay from the high-lying states of 124Sn was measured using the inelastic scattering of 17O at 340 MeV. The emitted γ rays were detected with high resolution with the AGATA demonstrator array and the scattered ions were detected in two segmented δE-E silicon telescopes. The angular distribution was measured both for the γ rays and the scattered 17O ions. An accumulation of E1 strength below the particle threshold was found and compared with previous data obtained with (γ, γ') and (α, α'γ) reactions. The present results of elastic scattering, and excitation of E2 and E1 states were analysed using the DWBA approach. From this comprehensive description the isoscalar component of the 1- excited states was extracted. The obtained values are based on the comparison of the data with DWBA calculations including a form factor deduced using a microscopic transition density., Grant No. 2011/03/B/ST2/01894; (iii) the National Superconducting Cyclotron Laboratory at MSU; (iv) the US NSF Grant PHY-1204486; and the German BMBF under Grant 06KY9136.

Published
2014
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41. Characterization of a gamma-ray tracking array: A comparison of GRETINA and Gamma sphere using a $^{60}$Co source

Author

T. Lauritsen, A. Korichi, O. Stezowski, Martin Carpenter, M. Cromaz, T. L. Khoo, S. Zhu, D. Seweryniak, I. Y. Lee, R. V. F. Janssens, A. N. Wilson, H. L. Crawford, S. Pietri, D. Weisshaar, R. M. Perez-Vidal, J. Dudouet, C. M. Campbell, A. D. Ayangeakaa, L. A. Riley, D. Ralet, N. Lalović, A. O. Macchiavelli, P. Fallon, E. Clément, D. C. Radford, John P. Greene, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, GRETA, Efficiency measurements, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], gamma-Ray tracking, Atomic, 01 natural sciences, Particle and Plasma Physics, Optics, 0103 physical sciences, Nuclear, Gammasphere, Segmented germaniumdetectors, Nuclear structure, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Cluster analysis, γ-Ray spectroscopy, Instrumentation, gamma-Ray spectroscopy, Physics, 010308 nuclear & particles physics, business.industry, Gamma ray, Molecular, γ-Ray tracking, Nuclear & Particles Physics, Other Physical Sciences, Formalism (philosophy of mathematics), GRETINA, Segmented germanium detectors, Electronic anticoincidence, business, Astronomical and Space Sciences
Abstract

International audience; In this paper, we provide a formalism for the characterization of tracking arrays with emphasis on the proper corrections required to extract their photopeak efficiencies and peak-to-total ratios. The methods are first applied to Gammasphere, a well characterized 4π array based on the principle of Compton suppression, and subsequently to GRETINA. The tracking efficiencies are then discussed and some guidelines as to what clustering angle to use in the tracking algorithm are presented. It was possible, using GEANT4 simulations, to scale the measured efficiencies up to the expected values for the full 4π implementation of GRETA.

Published
2016

42. The reaction $^{32}$S + $^{197}$Au near the interaction barrier

Author

P. K. Rath, W. H. Trzaska, M. Ciemala, I. Matea, A. Pulcini, S. Brambilla, G. N. Knyazheva, G. Sposito, Emanuele Vardaci, E. M. Kozulin, G. La Rana, D. Quero, I. V. Kolesov, F. Camera, C. Borcea, A. Maj, N. I. Kozulina, John W. Wilson, B. Decanditiis, O. Stezowski, V. V. Kirakosyan, M. Ashaduzzaman, C. Schmitt, K. V. Novikov, O. Dorvaux, E. Saveleva, I. M. Harca, A. Bracco, I. M. Itkis, S. Calinescu, C. Petrone, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), PARIS, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Range (particle radiation), Calorimeter (particle physics), ta114, Fission, Transactinide element, Coulomb barrier, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, Ion, Nuclear physics, fissio, fuusio, ydinreaktiot, prompt y-rays, quasifission, Nuclear reactions, Atomic physics, fysiikka, Nuclear Experiment, physics, fussion-fission
Abstract

International audience; The path to the synthesis of super heavy elements is strongly hindered by the competition between fusion and quasi-fission in heavy ions reactions at near barrier energies. We report on a recent experimental investigation performed at the ALTO facility of IPN Orsay, France on the heavy-ion collision around the Coulomb barrier of 32S+197Au. The fission-fragment mass and total kinetic energy were measured by the double arm mass spectrometer for binary fragments CORSET, using the double time of flight approach. The asymmetric structure on top of the predominant symmetric one may suggests the contribution from either quasi-fission or pre-equilibrium fission or might be driven by shell effects in the compound nucleus fission. To get further insight on such puzzling cases situated at the crossroads of the various opened channels, we extended the measurement to coincident prompt γ -rays, of low and high energy. For this purpose, the prompt γ-rays following fission were detected by the coupled high efficiency ORGAM array consisting of 10 Compton suppressed Germanium detectors (BGO shielded), located at backward angles and the first cluster of the future PARIS calorimeter consisting of 9 close packed phoswich detectors and another single phoswich, together covering a wide angular and energy range.

Published
2016

43. Superdeformed and Triaxial States in Ca 42

Author

G. Benzoni, Bo Cederwall, M. Komorowska, Begoña Quintana, D. Rosso, J. Styczen, Damiano Bortolato, J. J. Valiente Dobon, P. Bednarczyk, L. Charles, M. Ziȩbliński, W. Korten, R. Nicolini, L. Próchniak, P. Reiter, D. R. Napoli, T. Habermann, A. Maj, A. Gottardo, L. Berti, A. Lopez-Martens, G. Rampazzo, J. L. Wood, F. Nowacki, P. J. Coleman-Smith, C. Michelagnoli, B. Bounthong, S. Franchoo, P. Cocconi, T. Abraham, J. Ljungvall, Marco Bellato, M. Kicińska-Habior, P. Désesquelles, G. Anil Kumar, J. Mierzejewski, N. Kondratyev, K. Hadyńska-Klȩk, A. Korichi, P. A. Söderström, E. Sahin, Agnese Giaz, M. Kisieliński, F. Recchia, Benedicte Million, X. Grave, A. Gadea, N. Toniolo, S. F. Özmen, G. Maron, O. Stezowski, D. Karpiński, E. Farnea, S. Lunardi, S. Leoni, H. Naïdja, M. Palacz, J. Srebrny, D. Bazzacco, J. Iwanicki, F. Azaiez, B. Dulny, Joël Chavas, Roberto Isocrate, Alberto Pullia, G. Jaworski, P. J. Napiorkowski, J. Eberth, M. Gulmini, M. Kmiecik, Megumi Niikura, G. de Angelis, V. Vandone, M. Krzysiek, N. Karkour, F. C. L. Crespi, I. Stefan, B. Bruyneel, Ch. Theisen, M. Ciemala, A. Obertelli, M. Zielinska, Andrea Corsi, D. M. Cullen, B. Fornal, R. Menegazzo, C. A. Ur, K. Rusek, R. Wadsworth, A. Colombo, S. Myalski, G. Lehaut, A. Jungclaus, M. Kowalczyk, A. Czermak, W. Mȩczyński, B. Birkenbach, D. T. Doherty, M. D. Salsac, D. S. Judson, K. Mazurek, J. Grȩbosz, D. Mengoni, Tomás R. Rodríguez, B. Wasilewska, S. Brambilla, F. Camera, Andreas Görgen, E. Merchan, Andreas Wiens, K. Wrzosek-Lipska, Herbert Hess, N. Redon, European Commission, Federal Ministry of Education and Research (Germany), National Science Centre (Poland), Generalitat Valenciana, Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Ministerio de Economía y Competitividad (España), Research Council of Norway, Laboratori Nazionali di Legnaro, Helmholtz Centre for Heavy Ion Research, and University of Warsaw

Subjects
Physics, Sideband, 010308 nuclear & particles physics, SHELL model, Nuclear Theory, General Physics and Astronomy, Coulomb excitation, 7. Clean energy, 01 natural sciences, Superdeformation, Matrix (mathematics), Physics and Astronomy (all), 0103 physical sciences, AGATA, Atomic physics, 010306 general physics
Abstract

K. Hadyńska-Kl¸ek et al. ; 7 pags., 3 figs., 2 tabs., Shape parameters of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in Ca42 were determined from E2 matrix elements measured in the first low-energy Coulomb excitation experiment performed with AGATA. The picture of two coexisting structures is well reproduced by new state-of-the-art large-scale shell model and beyond-mean-field calculations. Experimental evidence for superdeformation of the band built on 02+ has been obtained and the role of triaxiality in the A∼40 mass region is discussed. Furthermore, the potential of Coulomb excitation as a tool to study superdeformation has been demonstrated for the first time. © 2016 American Physical Society, Special gratitude goes to the INFN LNL and HIL Warsaw technical staff for their support and help, in particular, the accelerator crews for providing intense and good-quality 42Ca and 32S beams. K. H.-K. acknowledges support from the Research Council of Norway under the project Grant No. 213442. T. R. R. acknowledges computing time at GSI-Darmstadt and support from Spanish MINECO under Programa Ramon y Cajal 11420 and FIS-2014-53434-P, H. N. acknowledges support from Helmholtz Association through the Nuclear Astrophysics Virtual Institute NAVI (No. VH-VI-417). We also acknowledge the support by Generalitat Valenciana, Spain, under the grant PROMETEOII/2014/019 and by the FEDER funds of the European Commission (A. Gadea), Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5 (A. J., A. Gadea), German Bundesministerium für Bildung und Forschung (BMBF) under Contract No. 05P12PKFNE TP4 (B. Birkenbach), the Polish National Science Centre under Projects No. DEC-2013/10/M/ST2/00427, No. DPN/N190/ AGATA/2009, No. 2011/03/B/ST2/01894, No. UMO- 2014/14/M/ST2/00738 (COPIN-INFN Collaboration), and No. 2015/17/B/ST2/01534.

Published
2016

44. Pair neutron transfer inNi60+Sn116probed viaγ-particle coincidences

Author

S. Courtin, A. Goasduff, C. Michelagnoli, J. Grebosz, D. Mengoni, P. Désesquelles, P. Reiter, D. Rosso, B. Birkenbach, A. Gadea, C Theisen, Suzana Szilner, D. Bazzacco, M. D. Salsac, A. Gottardo, F. Recchia, F. Haas, G. Pollarolo, Neven Soić, R. Menegazzo, A. M. Stefanini, D. Jelavić Malenica, M. Karolak, L. Corradi, P. A. Söderström, A. Maj, D. R. Napoli, A. Bracco, S. Leoni, C. A. Ur, T. Mijatović, Hans-Jurgen E. Hess, F. Scarlassara, A. Pullia, Andreas Görgen, M. Varga Pajtler, J. J. Valiente-Dobón, D. Montanari, A. Jungclaus, L. Charles, O. Stezowski, G. Montagnoli, and E. Fioretto

Subjects
Physics, education.field_of_study, Spectrometer, 010308 nuclear & particles physics, Population, Tracking (particle physics), 01 natural sciences, Coincidence, Excited state, 0103 physical sciences, Particle, Neutron, AGATA, Atomic physics, 010306 general physics, education
Abstract

We performed a γ -particle coincidence experiment for the 60Ni+116Sn system to investigate whether the population of the two-neutron pickup channel leading to 62Ni is mainly concentrated in the ground-state transition, as has been found in a previous work [D. Montanari et al., Phys. Rev. Lett. 113, 052501 (2014)]. The experiment has been performed by employing the PRISMA magnetic spectrometer coupled to theAdvanced Gamma Tracking Array (AGATA) demonstrator. The strength distribution of excited states corresponding to the inelastic, one- and two-neutron transfer channels has been extracted.We found that in the two-neutron transfer channel the strength to excited states corresponds to a fraction (less than 24%) of the total, consistent with the previously obtained results that the 2n channel is dominated by the ground-state to ground-state transition.

Published
2016

45. High-spin structure of Xe134

Author

J. J. Valiente-Dobón, A. O. Macchiavelli, T. Mijatović, P. R. John, G. de Angelis, Alberto Pullia, Suzana Szilner, A. M. Stefanini, D. Cline, A. Blazhev, X. Liang, F. Radeck, E. Fioretto, A. Gadea, C. A. Ur, M. Cromaz, F. C. L. Crespi, F. Recchia, C. J. Pearson, Andreas Görgen, W. Korten, A. B. Hayes, D. Bazzacco, P. Reiter, S. J. Freeman, P. Fallon, R. S. Chakrawarthy, A. Bracco, T. Steinbach, G. Pollarolo, R. Teng, Luna Pellegri, Daniel Ward, Zs. Podolyák, G. Montagnoli, O. Stezowski, J. Jolie, B. Birkenbach, C. Wheldon, A. Gottardo, S. Lunardi, D. Montanari, Herbert Hess, C. Y. Wu, M. Bowry, A. Vogt, P. H. Regan, B. Bruyneel, Agnese Giaz, L. Corradi, G. Sletten, A. Jungclaus, M. Siciliano, H. Hua, V. Vandone, W. Gelletly, E. Farnea, Fernando Scarlassara, J. Eberth, J. F. Smith, S. Leoni, Roberto Menegazzo, D. Mengoni, Robert Chapman, A. Gengelbach, D. R. Napoli, E. Sahin, K. Geibel, I. Y. Lee, C. Michelagnoli, D. D. Warner, Pär-Anders Söderström, B. Szpak, Andreas Wiens, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AGATA, Federal Ministry of Education and Research (Germany), European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Bonn-Cologne Graduate School of Physics and Astronomy, Science and Technology Facilities Council (UK), National Science Foundation (US), Generalitat Valenciana, Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Nuclear structure, Analytical chemistry, Molecular, Spin structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 01 natural sciences, 7. Clean energy, Atomic, Nuclear & Particles Physics, Subatomär fysik, Particle and Plasma Physics, 0103 physical sciences, Subatomic Physics, Heavy ion, Gammasphere, AGATA, Nuclear, 010306 general physics, Spin (physics), Nuclear Experiment
Abstract

A. Vogt et al. ; 12 págs.; 9 figs.; 1 tab., Detailed spectroscopic information on the N∼82 nuclei is necessary to benchmark shell-model calculations in the region. The nuclear structure above long-lived isomers in Xe134 is investigated after multinucleon transfer (MNT) and actinide fission. Xenon-134 was populated as (i) a transfer product in Xe136+U238 and Xe136+Pb208 MNT reactions and (ii) as a fission product in the Xe136+U238 reaction employing the high-resolution Advanced Gamma Tracking Array (AGATA). Trajectory reconstruction has been applied for the complete identification of beamlike transfer products with the magnetic spectrometer PRISMA. The Xe136+Pt198 MNT reaction was studied with the γ-ray spectrometer GAMMASPHERE in combination with the gas detector array Compact Heavy Ion Counter (CHICO). Several high-spin states in Xe134 on top of the two long-lived isomers are discovered based on γγ-coincidence relationships and information on the γ-ray angular distributions as well as excitation energies from the total kinetic energy loss and fission fragments. The revised level scheme of Xe134 is extended up to an excitation energy of 5.832 MeV with tentative spin-parity assignments up to 16+. Previous assignments of states above the 7- isomer are revised. Latest shell-model calculations employing two different effective interactions reproduce the experimental findings and support the new spin and parity assignments., The research leading to these results has received funding from the German BMBF under Contract No. 05P12PKFNE TP4, from the European Union Seventh Framework Programme FP7/2007–2013 under Grant Agreement No. 262010 - ENSAR, from the Spanish Ministerio de Ciencia e Innovación under Contract No. FPA2011-29854-C04, from the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5, from the Bonn-Cologne Graduate School of Physics and Astronomy (BCGS), from the UK Science and Technology Facilities Council (STFC), and from the US National Science Foundation (NSF). One of the authors (A. Gadea) has been supported by the Generalitat Valenciana, Spain, under Grant No. PROMETEOII/2014/019 and EU under the FEDER program.

Published
2016

46. Transition probabilities in neutron-richSe84,86

Author

Alain Goasduff, K. Kolos, Fernando Scarlassara, W. Korten, R. Lozeva, P. Désesquelles, A. M. Stefanini, E. Ellinger, C Theisen, Caterina Michelagnoli, D. Verney, V. Vandone, C. Fransen, O. Möller, Thomas Braunroth, G. Pollarolo, E. Farnea, M. Hackstein, Roman Gernhäuser, A. Vogt, A. Gottardo, B. Birkenbach, A. Pullia, F. Recchia, G. Montagnoli, L. Corradi, Hans-Jurgen E. Hess, M. D. Salsac, R. Menegazzo, P. Reiter, A. Jungclaus, A. Blazhev, D. Mengoni, A. Maj, J. Eberth, F. Ibrahim, A. Bracco, A. Dewald, O. Stezowski, B. Million, T. Mijatović, V. Modamio, Kamila Sieja, Suzana Szilner, F. C. L. Crespi, J. Litzinger, E. Fioretto, S. Bottoni, J. Jolie, D. Bazzacco, S. Lunardi, D. Montanari, S. Leoni, A. I. Morales, Megumi Niikura, G. de Angelis, F. Didierjean, G. Duchêne, J. Grebosz, Begoña Quintana, D. R. Napoli, Bo Cederwall, D. Rosso, J. J. Valiente Dobon, E. Sahin, Andreas Görgen, and P. A. Söderström

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, SHELL model, symbols.namesake, Recoil, Excited state, Quadrupole, symbols, Physics::Accelerator Physics, Neutron, Physics::Atomic Physics, Atomic physics, Nuclear Experiment, Doppler effect
Abstract

Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich Se-84,Se-86 are investigated with a recoil distance Doppler shift (RDDS) experiment. The experiment was perform ...

Published
2015

47. Conceptual design and infrastructure for the installation of the first AGATA sub-array at LNL

Author

A. Triossi, D. Conventi, A. M. Stefanini, G. Montagnoli, D. Lersch, D. Bazzacco, S. Aydin, John Paul Strachan, B. Bruyneel, C. He, Agnese Giaz, S. Brambilla, S. Fantinel, Enrico Calore, E. Sahin, A. Bracco, B. Million, S. M. Lenzi, R. Peghin, A. Gottardo, L. Berti, G. Maron, Alessandro Zucchiatti, B. Birkenbach, E. Fioretto, Gheorghe Pascovici, V. Vandone, C. Fanin, M. Bellato, E. Legay, N. Blasi, J. Grebosz, F. Zocca, A. Gadea, E. Bissiato, C. A. Ur, O. Stezowski, Roberto Menegazzo, D. Mengoni, Alberto Pullia, E. Farnea, P.M. Jones, Joël Chavas, Roberto Isocrate, M. Nicoletto, Damiano Bortolato, N. Dosme, P. Reiter, G. Rampazzo, A. Corsi, S. Badoer, S. Coelli, Herbert Hess, R. Beunard, Francesco Lelli, F. Recchia, A. Cortesi, M. Ozille, F. C. L. Crespi, Th. Pissulla, J. Jolie, A. Colombo, J. Eberth, G. Salvato, D. R. Napoli, T. Habermann, E. Grodner, C. Boiano, Ch. Fransen, L. Costa, A. Austin, C. Veyssiere, Fernando Scarlassara, F. Tomasi, P. Cocconi, R. Nicolini, N. Toniolo, S. Leoni, A. Dewald, R. Venturelli, R. Griffiths, C. Michelagnoli, L. Corradi, D. Rosso, V. F. E. Pucknell, E. Viscione, F. Veronese, Stefano Riboldi, A. Capsoni, C. Rossi Alvarez, Oliver Wieland, J. Simpson, X. Grave, S. Lunardi, M. Turcato, D. Montanari, G. de Angelis, M. Pignanelli, G. Benzoni, P. Molini, A. Latina, M. Rigato, W. Rother, L. Ramina, F. Camera, J. J. Valiente-Dobón, M. Rebeschini, Andreas Wiens, O. Möller, M. Gulmini, Research Group: Information Management, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, AGATA, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Sabire Yazıcı Fen-Edebiyat Fakültesi, Triossi, Andrea -- 0000-0001-5140-9154, Montanari, Daniele -- 0000-0002-1980-7686, Gadea, Andres -- 0000-0002-4233-1970, Calore, Enrico -- 0000-0002-2301-3838, Napoli, Daniel Ricardo -- 0000-0002-8154-6958, Menegazzo, Roberto -- 0000-0002-3060-5276, Zucchiatti, Alessandro -- 0000-0002-3647-596X, Sahin, Eda -- 0000-0003-0683-5140, Jones, Pete -- 0000-0001-7480-6603, benzoni, giovanna -- 0000-0002-7938-0338, GOTTARDO, Andrea -- 0000-0002-0390-5767, Montagnoli, Giovanna -- 0000-0002-8944-1456, Recchia, Francesco -- 0000-0002-8428-0112, GIAZ, Agnese -- 0000-0002-2550-450X, Pullia, Alberto -- 0000-0002-6393-747X, Scarlassara, Fernando -- 0000-0002-4663-8216, Nicoletto, Marino -- 0000-0001-9301-0782, Lelli, Francesco -- 0000-0003-1900-9171, and Camera, Franco -- 0000-0003-1731-4834

Subjects
Nuclear and High Energy Physics, DANTE Heavy-ion Detector, Physics::Instrumentation and Detectors, HELENA multiplicity filter, 01 natural sciences, 7. Clean energy, Particle detector, Nuclear physics, PRISMA spectrometer, Conceptual design, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Gamma detection, Instrumentation, TRACE SI detector, Physics, Spectrometer, 010308 nuclear & particles physics, business.industry, Semiconductor detector, Cologne plunger, AGATA, DANTE heavy-ion-detector, business, Computer hardware
Abstract

WOS: 000295765100014, The first implementation of the AGATA spectrometer consisting of five triple germanium detector clusters has been installed at Laboratori Nazionali di Legnaro, INFN. This setup has two major goals, the first one is to validate the gamma-tracking concept and the second is to perform an experimental physics program using the stable beams delivered by the Tandem-PIAVE-ALPI accelerator complex. A large variety of physics topics will be addressed during this campaign, aiming to investigate both neutron and proton-rich nuclei. The setup has been designed to be coupled with the large-acceptance magnetic-spectrometer PRISMA. Therefore, the in-beam prompt gamma rays detected with AGATA will be measured in coincidence with the products of multinucleon-transfer and deep-inelastic reactions measured by PRISMA. Moreover, the setup is versatile enough to host ancillary detectors, including the heavy-ion detector DANTE, the gamma-ray detector array HELENA, the Cologne plunger for lifetime measurements and the Si-pad telescope TRACE. In this paper the design; characteristics and performance figures of the setup will be described.

Published
2011

48. Lifetime measurement in neutron-rich A~100 nuclei

Author

Oliver J. Roberts, L. M. Fraile, W. Korten, Takaharu Otsuka, E. Wilson, N. Warr, O. Stezowski, M. Zielińska, Aurelien Blanc, Ulli Köster, F. Drouet, Tomoaki Togashi, W. Urban, Paolo Mutti, Torsten Soldner, S. Ansari, J.-M. Régis, Michael Jentschel, Yusuke Tsunoda, T. Kröll, N. Saed-Samii, C. A. Ur, S. Ilieva, V. Paziy, Noritaka Shimizu, C. Townsley, Henryk Mach, J. Jolie, G. S. Simpson, A.-L. Hartig, J. F. Smith, M. D. Salsac, A. Vancraeyenest, C. Larijani, Marcus Scheck, Eric Clément, Raymond J. Carroll, A. Ignatov, Alison Bruce, Zs. Podolyák, S. Lalkovski, P. H. Regan, N. Marginean, V. Vedia, B. Olaizola, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, 010308 nuclear & particles physics, Fission, QC1-999, SHELL model, Monte Carlo method, Nuclear Theory, Centroid, Deformation (meteorology), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, Neutron, 010306 general physics, Nuclear Experiment
Abstract

Lifetimes of excited states of the 98;100;102Zr nuclei were measured by using the Generalized Centroid Difference Method. The nuclei of interest were populated via neutron-induced fission of 241Pu and 235U during the EXILL-FATIMA campaign. The obtained lifetimes were used to calculate the B(E2) transition strengths and β deformation parameters which were then compared with the recent theoretical predictions obtained with Monte Carlo Shell Model.

Published
2018

49. High-spin excitations of 81, 82, 83, 85Se : Competing single-particle and collective structures around N = 50

Author

Marie-Geneviève Porquet, A. Astier, O. Dorvaux, A. Buta, O. Stezowski, N. Redon, Ts. Venkova, F. Azaiez, D. Curien, A. Prévost, B. J. P. Gall, F. Khalfallah, R. Lucas, I. Deloncle, Marco Meyer, G. Duchêne, M. Rousseau, A. A. Bogachev, I. Piqueras, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, 21.60.Cs - 23.20.Lv - 25.85.Ge - 27.50.+e, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Hadron, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Coincidence, 0103 physical sciences, Nuclear fusion, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Excitation
Abstract

The 81, 82, 83, 85Se nuclei have been produced as fission fragments in the fusion reaction 18O + 208Pb at 85MeV bombarding energy and studied with the Euroball IV array. Their high-spin level schemes have been built from the triple $ \gamma$ -ray coincidence data and $ \gamma$ - $ \gamma$ angular correlations have been analyzed in order to assign spin and parity values to many observed states. The lowest-spin states of the two-neutron and three-neutron configurations are strongly mixed with two-proton excitations among the fp orbits. On the other hand, the highest-spin states of these neutron configurations are found to remain almost pure. Neutron excitation across the N = 50 gap is observed both in 83Se49 and in 85Se51 .

Published
2009

50. Fission fragment properties obtained in the γ - γ - γ coincidence method in the reaction 208Pb(18O, f )

Author

O. Dorvaux, M. Rousseau, I. Deloncle, O. Stezowski, D. Curien, N. Redon, L. Krupa, F. Khalfallah, A. A. Bogachev, E. M. Kozulin, M. G. Itkis, B. J. P. Gall, G. Duchêne, Marie-Geneviève Porquet, A. Astier, Louise Stuttge, and Francis Hanappe

Subjects
Physics, Nuclear and High Energy Physics, Mass distribution, 010308 nuclear & particles physics, Fission, Analytical chemistry, Total neutron, 01 natural sciences, Coincidence, Nuclear physics, 0103 physical sciences, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Spectroscopy, Beam energy
Abstract

Independent fission fragment yields have been obtained for the six fragment pairs ( Z L/Z H = 44/46 , 42/48, 40/50, 38/52, 36/54 and 34/56) in 208Pb(18O, f ) at the beam energy E = 85 MeV. γ -ray spectroscopy technique was applied to analyze the experimental data. With use of these data the mass distribution of fission fragments was restored. Data on average fragment spin distribution and total neutron multiplicity are presented. The agreement of the obtained results with other experimental data proves the validity of the applied method to solve this kind of problems.

Published
2007

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