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1. Emergence of triaxiality in 74Se from electric monopole transition strengths

Author

N. Marchini, A. Nannini, M. Rocchini, T.R. Rodríguez, M. Ottanelli, N. Gelli, A. Perego, G. Benzoni, N. Blasi, G. Bocchi, D. Brugnara, A. Buccola, G. Carozzi, A. Goasduff, E.T. Gregor, P.R. John, M. Komorowska, D. Mengoni, F. Recchia, S. Riccetto, D. Rosso, A. Saltarelli, M. Siciliano, J.J. Valiente-Dobón, and I. Zanon

Subjects
Electric monopole (E0) transitions, Internal conversion, Nuclear structure, Physics, QC1-999
Abstract

The structure of 74Se at low energy was investigated via spectroscopy of internal conversion electrons at the INFN Legnaro National Laboratories (LNL). A set of internal K-conversion coefficients and monopole transition strengths was measured. A large ρ2(E0;22+→21+)⋅103=210(130) value was deduced. This result, in addition to a low upper limit for the 03+→02+ electron transition, casts in doubt a simple interpretation of the 74Se low-lying structure, in particular the recently proposed spherical, vibrational character. New microscopic beyond-mean-field calculations generally agree with the experimental results and are capable of producing a large ρ2(E0;22+→21+) value, even if still a factor ≈7 smaller than the experiment. Triaxiality and a complex shape-coexistence and mixing scenario seem responsible for this unexpected experimental result.

Published
2023
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2. The structure of low-lying 1− states in 90,94Zr from (α,α′γ) and (p,p′γ) reactions

Author

F.C.L. Crespi, A. Bracco, E.G. Lanza, A. Tamii, N. Blasi, F. Camera, O. Wieland, N. Aoi, D.L. Balabanski, S. Bassauer, A.S. Brown, M.P. Carpenter, J.J. Carroll, M. Ciemała, A. Czeszumska, P.J. Davies, V. Derya, L.M. Donaldson, Y.D. Fang, H. Fujita, G. Gey, H.T. Ha, M.N. Harakeh, T. Hashimoto, N. Ichige, E. Ideguchi, A. Inoue, J. Isaak, C. Iwamoto, D.G. Jenkins, T. Klaus, N. Kobayashi, T. Koike, M. Krzysiek, M.K. Raju, M. Liu, A. Maj, L. Morris, P. von Neumann Cosel, S. Noji, H.J. Ong, S.G. Pickstone, N. Pietralla, D. Savran, J.M. Schmitt, M. Spieker, G. Steinhilber, C. Sullivan, B. Wasilewska, M. Weinert, V. Werner, Y. Yamamoto, T. Yamamoto, R.G.T. Zegers, X. Zhou, S. Zhu, and A. Zilges

Subjects
Nuclear structure, Dipole excitation around neutron threshold, Inelastic scattering, Physics, QC1-999
Abstract

The low-lying dipole strength in the 90,94Zr nuclei was investigated via (p,p′γ) at 80 MeV and (α,α′γ) at 130 MeV. The experiments, made at RCNP, used the magnetic spectrometer Grand Raiden for the scattered particles and the array CAGRA with HPGe detectors for the γ-decay. For 94Zr these are the first data for both reactions and for 90Zr these are the first data with (p,p′γ) and the first ones at high resolution for (α,α′γ). The comparison of the present results for the two nuclei with existing (γ,γ′) data shows that both nuclear probes produce an excitation pattern different than that of the electromagnetic probes.DWBA calculations were made using form factors deduced from transition densities, based on RPA calculations, characterized by a strong neutron component at the nuclear surface. A combined analysis of the two reactions was performed for the first time to investigate the isoscalar character of the 1− states in 90,94Zr. The (p,p′γ) cross section was calculated using values for the isoscalar electric dipole energy-weighted sum rule (E1 ISEWSR) obtained from the (α,α′γ) data. The isoscalar strength for 90Zr was found to exhaust 20 ± 2.5% of the EWSR in the energy range up to 12 MeV. In case of 94Zr, a strength of 9 ± 1.1% of the EWSR was found in the range up to 8.5 MeV.Although an overall general description was obtained in the studied energy intervals, not all proton cross sections were well reproduced using the isoscalar strength from (α,α′γ). This might suggest mixing of isoscalar and isovector components and that this mixing and the degree of collectivity are not the same for all the 1− states below the particle binding energy.

Published
2021
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3. 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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4. Is seniority a partial dynamic symmetry in the first νg9/2 shell?

Author

A.I. Morales, G. Benzoni, H. Watanabe, G. de Angelis, S. Nishimura, L. Coraggio, A. Gargano, N. Itaco, T. Otsuka, Y. Tsunoda, P. Van Isacker, F. Browne, R. Daido, P. Doornenbal, Y. Fang, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Söderström, T. Sumikama, J.J. Valiente-Dobón, J. Wu, Z.Y. Xu, A. Yagi, R. Yokoyama, H. Baba, R. Avigo, F.L. Bello Garrote, N. Blasi, A. Bracco, A.M. Bruce, F. Camera, S. Ceruti, F.C.L. Crespi, M.-C. Delattre, Zs. Dombradi, A. Gottardo, T. Isobe, I. Kojouharov, N. Kurz, I. Kuti, S. Lalkovski, K. Matsui, B. Melon, D. Mengoni, T. Miyazaki, V. Modamio-Hoybjor, S. Momiyama, D.R. Napoli, M. Niikura, R. Orlandi, Zs. Podolyák, P.H. Regan, H. Sakurai, E. Sahin, D. Sohler, H. Schaffner, R. Taniuchi, J. Taprogge, Zs. Vajta, O. Wieland, and M. Yalcinkaya

Subjects
Physics, QC1-999
Abstract

The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni.

Published
2018
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5. Type II shell evolution in A=70 isobars from the N≥40 island of inversion

Author

A.I. Morales, G. Benzoni, H. Watanabe, Y. Tsunoda, T. Otsuka, S. Nishimura, F. Browne, R. Daido, P. Doornenbal, Y. Fang, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Söderström, T. Sumikama, J. Wu, Z.Y. Xu, A. Yagi, R. Yokoyama, H. Baba, R. Avigo, F.L. Bello Garrote, N. Blasi, A. Bracco, F. Camera, S. Ceruti, F.C.L. Crespi, G. de Angelis, M.-C. Delattre, Zs. Dombradi, A. Gottardo, T. Isobe, I. Kojouharov, N. Kurz, I. Kuti, K. Matsui, B. Melon, D. Mengoni, T. Miyazaki, V. Modamio-Hoybjor, S. Momiyama, D.R. Napoli, M. Niikura, R. Orlandi, H. Sakurai, E. Sahin, D. Sohler, H. Schaffner, R. Taniuchi, J. Taprogge, Zs. Vajta, J.J. Valiente-Dobón, O. Wieland, and M. Yalcinkaya

Subjects
Physics, QC1-999
Abstract

The level structures of 70Co and 70Ni, populated from the β decay of 70Fe, have been investigated using β-delayed γ-ray spectroscopy following in-flight fission of a 238U beam. The experimental results are compared to Monte-Carlo Shell-Model calculations including the pf+g9/2+d5/2 orbitals. The strong population of a (1+) state at 274 keV in 70Co is at variance with the expected excitation energy of ∼1 MeV from near spherical single-particle estimates. This observation indicates a dominance of prolate-deformed intruder configurations in the low-lying levels, which coexist with the normal near spherical states. It is shown that the β decay of the neutron-rich A=70 isobars from the new island of inversion to the Z=28 closed-shell regime progresses in accordance with a newly reported type of shell evolution, the so-called Type II, which involves many particle-hole excitations across energy gaps.

Published
2017
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6. Decay properties of 68,69,70Mn: Probing collectivity up to N=44 in Fe isotopic chain

Author

G. Benzoni, A.I. Morales, H. Watanabe, S. Nishimura, L. Coraggio, N. Itaco, A. Gargano, F. Browne, R. Daido, P. Doornenbal, Y. Fang, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Söderström, T. Sumikama, J. Wu, Z.Y. Xu, R. Yokoyama, H. Baba, R. Avigo, F.L. Bello Garrote, N. Blasi, A. Bracco, F. Camera, S. Ceruti, F.C.L. Crespi, G. de Angelis, M.-C. Delattre, Zs. Dombradi, A. Gottardo, T. Isobe, I. Kuti, K. Matsui, B. Melon, D. Mengoni, T. Miyazaki, V. Modamio-Hoybjor, S. Momiyama, D.R. Napoli, M. Niikura, R. Orlandi, H. Sakurai, E. Sahin, D. Sohler, R. Taniuchi, J. Taprogge, Zs. Vajta, J.J. Valiente-Dobón, O. Wieland, and M. Yalcinkaya

Subjects
Physics, QC1-999
Abstract

The β decays Mn68→Fe68, Mn69→Fe69 and Mn70→Fe70 have been measured at the RIBF facility at RIKEN using the EURICA γ spectrometer combined with an active stopper consisting of a stack of Si detectors. The nuclei were produced as fission fragments from a beam of 238U at a bombarding energy of 345 MeV/nucleon impinging on a Be target and selected using the BigRIPS separator. Half-lives and β-delayed neutron emission probabilities have been extracted for these decays, together with first experimental information on excited states populated in 69,70Fe. The data indicate a continuously increasing deformation for Fe isotopes up to A=70. This is interpreted, as for Cr isotopes, in terms of the interplay between the quadrupole correlations of the ν1d5/2 and ν0g9/2 orbitals and the monopole component of the π0f7/2–ν0f5/2 interaction.

Published
2015
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7. 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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8. The structure of low-lying 1− states in 90,94Zr from (α,α′γ) and (p,p′γ) reactions

Author

Miao Liu, T. Hashimoto, J.M. Schmitt, X. K. Zhou, O. Wieland, C. Iwamoto, Norbert Pietralla, B. Wasilewska, S. Zhu, A. Czeszumska, Johann Isaak, T. Klaus, C. Sullivan, A. Inoue, M.K. Raju, Y.D. Fang, Nobuyuki Kobayashi, F. Camera, Yoshihisa Yamamoto, Shumpei Noji, V. Werner, A. Maj, G. Gey, D. G. Jenkins, Hooi Jin Ong, M. Krzysiek, F. C. L. Crespi, Andreas Zilges, M. Ciemała, L. Morris, R. G. T. Zegers, Takeshi Koike, T. Yamamoto, M. P. Carpenter, G. Steinhilber, D. L. Balabanski, A. Bracco, S. Bassauer, V. Derya, Nori Aoi, J. J. Carroll, E.G. Lanza, M. Spieker, A. S. Brown, N. Ichige, Deniz Savran, H. Fujita, S. G. Pickstone, N. Blasi, P. J. Davies, P. von Neumann Cosel, M.N. Harakeh, H.T. Ha, Atsushi Tamii, M. Weinert, L. M. Donaldson, Eiji Ideguchi, and Research unit Nuclear & Hadron Physics

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Inelastic scattering, Isovector, Proton, 010308 nuclear & particles physics, Isoscalar, Binding energy, 01 natural sciences, Dipole excitation around neutron threshold, lcsh:QC1-999, Dipole, 0103 physical sciences, Neutron, Sum rule in quantum mechanics, Nuclear structure, Atomic physics, 010306 general physics, lcsh:Physics
Abstract

The low-lying dipole strength in the 90,94Zr nuclei was investigated via (p,p′γ) at 80 MeV and (α,α′γ) at 130 MeV. The experiments, made at RCNP, used the magnetic spectrometer Grand Raiden for the scattered particles and the array CAGRA with HPGe detectors for the γ-decay. For 94Zr these are the first data for both reactions and for 90Zr these are the first data with (p,p′γ) and the first ones at high resolution for (α,α′γ). The comparison of the present results for the two nuclei with existing (γ,γ′) data shows that both nuclear probes produce an excitation pattern different than that of the electromagnetic probes. DWBA calculations were made using form factors deduced from transition densities, based on RPA calculations, characterized by a strong neutron component at the nuclear surface. A combined analysis of the two reactions was performed for the first time to investigate the isoscalar character of the 1− states in 90,94Zr. The (p,p′γ) cross section was calculated using values for the isoscalar electric dipole energy-weighted sum rule (E1 ISEWSR) obtained from the (α,α′γ) data. The isoscalar strength for 90Zr was found to exhaust 20 ± 2.5% of the EWSR in the energy range up to 12 MeV. In case of 94Zr, a strength of 9 ± 1.1% of the EWSR was found in the range up to 8.5 MeV. Although an overall general description was obtained in the studied energy intervals, not all proton cross sections were well reproduced using the isoscalar strength from (α,α′γ). This might suggest mixing of isoscalar and isovector components and that this mixing and the degree of collectivity are not the same for all the 1− states below the particle binding energy.

Published
2021

9. Probing isospin mixing with the giant dipole resonance in the Zn-60 compound nucleus

Author

S. Pascu, J. Kaur, G. Gosta, M. Rocchini, A. Montaner, G. de Angelis, A. Nannini, R. Menegazzo, F. Galtarossa, S. Capra, D. Mengoni, G. Pasqualato, M. Ciemala, C. Porzio, F. Camera, S. M. Lenzi, A. Boso, D. Filipescu, V. Zamfir, J. Yang, A. Giaz, A. Gadea, S. Riboldi, A. Gottardo, S. Brambilla, Tuncay Bayram, B. Wasilewska, A. Maj, D. Brugnara, D. Bazzacco, F. C. L. Crespi, S. Ceruti, J. J. Valiente-Dobón, N. Blasi, M. Siciliano, T. Marchi, N. Marginean, P. R. John, M. Kmiecik, D. R. Napoli, R. Raabe, G. Jaworski, A. Bracco, O. Wieland, G. Benzoni, S. Leoni, A. Mentana, F. Recchia, I. Zanon, B. Million, A. Goasduff, Dmitry Testov, N. Marchini, S. Ziliani, M. Zieblinski, O. Poleshchuk, A. Gozzelino, T. Glodariu, and D. Ghita

Subjects
Physics, Science & Technology, 010308 nuclear & particles physics, SYMMETRY, WIDTH, Resonance, 01 natural sciences, 3. Good health, Dipole, medicine.anatomical_structure, Physics, Nuclear, Isospin, 0103 physical sciences, Physical Sciences, medicine, Atomic physics, 010306 general physics, Nucleus, Mixing (physics), BREAKING
Abstract

ispartof: PHYSICAL REVIEW C vol:103 issue:4 status: published

Published
2021

10. The GALILEO γ-ray array at the Legnaro National Laboratories

Author

R. Menegazzo, I. Zanon, F. Veronese, D.A. Testov, J. Ha, N. Bez, B. Million, G. Pasqualato, Alberto Pullia, M. Biasotto, L. Ramina, S. Bottoni, C. A. Ur, M. L. Cortés, D. Mengoni, S. Coelli, G. Gosta, C. Fanin, M. Siciliano, A. Saltarelli, D. Bazzacco, D. Tomasella, J. J. Valiente-Dobón, S. Leoni, M. Romanato, S. Ventura, A. Gadea, N. Toniolo, Marco Bellato, Diego Barrientos, S. Brambilla, D. Brugnara, R.M. Pérez-Vidal, F. Recchia, F. C. L. Crespi, F.J. Egea, S. Lunardi, S. Capra, M. Rebeschini, S. Fantinel, G. Jaworski, A. Bracco, M. Gulmini, G. Rampazzo, M. Scarcioffolo, N. Blasi, J. Pellumaj, S. Pigliapoco, G. Benzoni, V. Volpe, P. Cocconi, A. Boso, O. Wieland, K. Hadyńska-Klȩk, E.R. Gamba, A. Capsoni, A. Gambalonga, E. Viscione, F. Camera, G. de Angelis, A. Nannini, Roberto Isocrate, C. Boiano, A. Illana, M. Rocchini, G. Zhang, A. Gottardo, A. Goasduff, C. Gesmundo, P. R. John, N. Marchini, S. Ziliani, K. Rezynkina, D. R. Napoli, E. Gregor, A. Gozzelino, D. Rosso, M. Rampazzo, V. Modamio, M. Polettini, M. Magalini, F. Tomasi, S. M. Lenzi, and C. Porzio

Subjects
Physics, Nuclear and High Energy Physics, Silicon, business.industry, Instrumentation, High-resolution γ-ray spectroscopy, Detector, Neutron, DAQ, Electronics, HPGe, Semiconductor detector, Optics, Data acquisition, Galileo (vibration training), business, Hpge detector
Abstract

GALILEO, a new 4 π high-resolution γ -detection array, based on HPGe detectors, has been developed and installed at the Legnaro National Laboratories. The GALILEO array greatly benefits from a fully-digital read-out chain, customized DAQ, and a variety of complementary detectors to improve the resolving power by the detection of particles, ions or high-energy γ -ray transitions. In this work, a full description of the array, including electronics and DAQ, is presented together with its complementary instrumentation.

Published
2021

11. Transition strengths in the neutron-rich Ni73,74,75 isotopes

Author

P. A. Söderström, T. Furumoto, K. Kaneko, D. Mengoni, J. J. Valiente-Dobón, K. Matsui, István Kuti, Nunzio Itaco, Yoshiaki Shiga, Zhengyu Xu, G. de Angelis, F. Browne, Dóra Sohler, S. Ceruti, A. Gargano, Zs. Vajta, D. R. Napoli, Rin Yokoyama, M. Yalcinkaya, L. Coraggio, Satoshi Takeuchi, H. Liu, R. Orlandi, V. Modamio-Hoybjor, Jinguang Wu, E. Sahin, L. Sinclair, Ryo Taniuchi, F. L. Bello Garrote, F. C. L. Crespi, T. Isobe, G. Benzoni, P. Doornenbal, Stephen Rice, A. Gottardo, Jenny Lee, Satoru Momiyama, Hiroshi Watanabe, D. Fang, Giuseppe Lorusso, Hiroyoshi Sakurai, Jan Taprogge, M. C. Delattre, Masafumi Matsushita, R. Avigo, Megumi Niikura, T. Motobayashi, B. Melon, O. Wieland, R. Daido, Zs. Dombrádi, H. Wang, N. Blasi, H. Baba, Toshiyuki Sumikama, Z. Patel, Shunji Nishimura, Tsuyoshi Miyazaki, and P. Van Isacker

Subjects
Physics, Proton, Isotope, 010308 nuclear & particles physics, Shell (structure), Coulomb excitation, 01 natural sciences, medicine.anatomical_structure, 0103 physical sciences, medicine, Neutron, Atomic physics, 010306 general physics, Nucleus, Excitation, Line (formation)
Abstract

Reduced transition probabilities have been measured for the neutron-rich Ni73,74,75 nuclei with relativistic Coulomb excitation performed at the RIKEN Nishina Center. For the even-even Ni isotope the determined B(E2;0+→2+) value is compatible within errors with the result of a previous intermediate energy Coulomb excitation experiment, although being somewhat larger. For the odd Ni isotopes B(E2) values have been determined for the first time. In the middle νg9/2 shell nucleus Ni73 three peak candidates have been observed and tentatively assigned to the (5/2+), (13/2+), and (11/2+) excitations. Two peak candidates have been observed in Ni75 and tentatively assigned to the (13/2+) and (11/2+) levels. The measured B(E2) values are in line with the large B(E2) reported in Ni70 and at variance with the small strength measured in Ni72. Excitation energies compare well with the result of large-scale shell-model calculations, while B(E2) values are larger than predicted. This could indicate an increasing contribution of proton excitations across the Z=28 shell closure when approaching Ni78.

Published
2020

12. g factor of the $12^+$K-isomer in $^{174}$W

Author

F. Camera, A. I. Morales, E. Vigezzi, O. Wieland, C. Michelagnoli, R. Menegazzo, P. Sona, J. J. Valiente-Dobón, D. Bazzacco, A. Nannini, S. Bottoni, Georgi P. Georgiev, D. R. Napoli, S. Ceruti, G. Bocchi, N. Blasi, Luna Pellegri, V. Modamio, C. A. Ur, M. Rocchini, S. Leoni, B. Million, R. Avigo, A. Perego, B. Melon, D. Mengoni, A. Bracco, G. Benzoni, Agnese Giaz, A. Gottardo, F. C. L. Crespi, M. Ottanelli, E. R. Gamba, P. R. John, S. Capra, 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 Laue-Langevin (ILL), ILL, 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, 010308 nuclear & particles physics, g factor, Landé g-factor, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Tunnel effect, 0103 physical sciences, Quadrupole, Nuclear fusion, Atomic physics, 010306 general physics, Ground state, Dimensionless quantity
Abstract

The g factor of the $$12^+$$ K-isomer in $$^{174}$$ W has been measured by means of the time-differential perturbed angular distribution technique as $$g(12^+)=+0.304(11)$$ . In addition, the half-life of the isomer has been remeasured as $$T_{1/2}(12^+)=124(8)$$ ns, in agreement with the literature value and confirming the anomalous hindrance F of the E2 transition to the $$10^+$$ level of the ground state band with respect to the $$\gamma $$ -tunnelling model prediction. The measured g factor has been compared with estimates based on experimental g factors from odd-mass isotopes in the same mass region and with Nilsson model calculations. The results establish unique features of the $$12^+$$ K-isomer in $$^{174}$$ W, which can possess a non-pure intrinsic configuration and/or can be characterised by values of the intrinsic quadrupole moment $$Q_0$$ and the rotational g factor $$g_R$$ significantly different with respect to the majority of K-isomers at mass $$A \approx 180$$ .

Published
2020

13. 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

14. Isospin symmetry in the 60Zn nucleus

Author

D. M. Filipescu, D. Mengoni, V. Zamfir, F. C. L. Crespi, O. Poleshchuk, G. Gosta, G. Jaworski, A. Bracco, B. Wasilewska, D. Bazzacco, M. Zieblinski, B. Million, G. Benzoni, M. Kmiecik, A. Mentana, D. A. Testov, P. R. John, A. Giaz, A. Boso, J. J. Valiente-Dobón, O. Wieland, S. Leoni, F. Recchia, D. Ghita, A. Goasduff, F. Camera, G. Bocchi, N. Blasi, R. Raabe, S. Brambilla, T. Marchi, G. de Angelis, Jiecheng Yang, M. Ciemala, A. Maj, M. Siciliano, D. R. Napoli, S. Ceruti, and F. Galtarossa

Subjects
Physics, Particle physics, medicine.anatomical_structure, Isospin, medicine, General Physics and Astronomy, Nucleus, Symmetry (physics)
Abstract

Export Date: 14 August 2020 ispartof: Acta Physica Polonica B vol:51 issue:3 pages:683-688 ispartof: location:POLAND, Piaski status: published

Published
2020

15. Response function and linearity for high energy γ-rays in large volume LaBr3:Ce detectors

Author

D. Takenaka, F. Camera, Agnese Giaz, G. Gosta, N. Blasi, O. Wieland, F.M. Rossi, Hiroaki Utsunomiya, B. Million, Ioana Gheorghe, D. M. Filipescu, and Takashi Ari-izumi

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Monte Carlo method, Isotropy, Detector, Linearity, 7. Clean energy, 01 natural sciences, Collimated light, Spectral line, Nuclear physics, Volume (thermodynamics), 0103 physical sciences, Physics::Accelerator Physics, Atomic physics, 010306 general physics, Instrumentation
Abstract

The response function to high energy γ γ -rays of two large volume LaBr 3 :Ce crystals (3.5”x8”) and the linearity of the coupled PMT’s were investigated at the NewSUBARU facility, where γ γ -rays in the energy range 6 –38 MeV were produced and sent into the detectors. Monte Carlo simulations were performed to reproduce the experimental spectra. The photopeak and interaction efficiencies were also evaluated both in case of a collimated beam or an isotropic source.

Published
2018

16. Type II shell evolution in A = 70 isobars from the N ≥ 40 island of inversion

Author

G. de Angelis, A. I. Morales, A. Gottardo, Zs. Dombradi, A. Bracco, Zhengyu Xu, Pieter Doornenbal, E. Sahin, Shunji Nishimura, Hiroyoshi Sakurai, H. Schaffner, R. Orlandi, F. C. L. Crespi, Giuseppe Lorusso, N. Blasi, K. Matsui, N. Kurz, P. A. Söderström, Y. F. Fang, S. Ceruti, R. Avigo, Tadashi Miyazaki, R. Taniuchi, R. Daido, Jan Taprogge, V. Modamio-Hoybjor, Jin Wu, Yusuke Tsunoda, G. Benzoni, Zena Patel, F. Camera, Rin Yokoyama, István Kuti, F. Browne, D. R. Napoli, B. Melon, Stephen Rice, Takaharu Otsuka, Megumi Niikura, Toshiyuki Sumikama, J. J. Valiente-Dobón, Hidetada Baba, Oliver Wieland, F. L. Bello Garrote, Hirofumi Watanabe, L. Sinclair, M. Yalcinkaya, Ayumi Yagi, I. Kojouharov, Tadaaki Isobe, M. C. Delattre, Satoru Momiyama, D. Mengoni, D. Sohler, Zs. Vajta, 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), 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), and SCOAP

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, 010308 nuclear & particles physics, Fission, Island of inversion, Population, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, lcsh:QC1-999, Atomic orbital, 0103 physical sciences, Isobar, ddc:530, Atomic physics, 010306 general physics, Spectroscopy, education, lcsh:Physics, Excitation
Abstract

The level structures of 70 Co and 70 Ni, populated from the β decay of 70 Fe, have been investigated using β -delayed γ -ray spectroscopy following in-flight fission of a 238 U beam. The experimental results are compared to Monte-Carlo Shell-Model calculations including the pf+g9/2+d5/2 orbitals. The strong population of a (1+) state at 274 keV in 70 Co is at variance with the expected excitation energy of ∼1 MeV from near spherical single-particle estimates. This observation indicates a dominance of prolate-deformed intruder configurations in the low-lying levels, which coexist with the normal near spherical states. It is shown that the β decay of the neutron-rich A=70 isobars from the new island of inversion to the Z=28 closed-shell regime progresses in accordance with a newly reported type of shell evolution, the so-called Type II, which involves many particle-hole excitations across energy gaps. Elsevier

Published
2017

17. Detection properties and internal activity of newly developed La-containing scintillator crystals

Author

N. Blasi, F. Camera, Giacomo Colombi, Michaël Josselin, Benedicte Million, G. Hull, 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), and 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)

Subjects
Nuclear and High Energy Physics, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Scintillator, 01 natural sciences, 0103 physical sciences, Lanthanum, Scintillator crystals, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Spectroscopy, Instrumentation, Physics, Interaction point, 010308 nuclear & particles physics, Resolution (electron density), Gamma ray, 021001 nanoscience & nanotechnology, Internal activity, Characterization (materials science), LaBr3:Ce, chemistry, Yield (chemistry), LaBr 3 :Ce, Elpasolite, 0210 nano-technology
Abstract

International audience; In this work, we will present the characterization, in terms of gamma response and internal activity of newly developed crystals that contains Lanthanum in their chemical formula. In particular we tested two LaBr 3 :Ce,Sr, one CLLBC and two CLLB crystals with different volumes. These crystals just overcome the prototype stage and, even if the production in still not standardized at least for large optics, they have been very recently commercialized in sizes interesting for high-energy gamma-ray spectroscopy, as for application in nuclear physics experiments. In particular, we will report on the study of the decay time, light yield and energy resolution with gamma rays, on the response as a function of the gamma interaction point and on the internal activity due to the presence of Lanthanum.

Published
2019

18. The CLYC-6 and CLYC-7 response to γ-rays, fast and thermal neutrons

Author

M. Tardocchi, A. Giaz, A Pietropaolo, Luna Pellegri, M. Nocente, Giuseppe Gorini, Marica Rebai, Mario Pillon, S. Brambilla, Stefano Riboldi, F. Camera, N. Blasi, B. Million, S. Ceruti, Carlo Cazzaniga, Giaz, A, Pellegri, L, Camera, F, Blasi, N, Brambilla, S, Ceruti, S, Million, B, Riboldi, S, Cazzaniga, C, Gorini, G, Nocente, M, Pietropaolo, A, Pillon, M, Rebai, M, Tardocchi, M, Pillon, M., and Pietropaolo, A.

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Analytical chemistry, Scintillator, 01 natural sciences, CLYC scintillator, Fast neutron measurements, Gamma spectroscopy, Neutron-gamma discrimination, Instrumentation, Fast neutron measurement, Nuclear physics, Neutron generator, 0103 physical sciences, Neutron detection, Neutron, Nuclear Experiment, 010306 general physics, Physics, 010308 nuclear & particles physics, Neutron temperature, Neutron source, Tritium
Abstract

The crystal Cs2LiYCI6:Ce (CLYC) is a very interesting scintillator material because of its good energy resolution and its capability to identify gamma-rays and fast/thermal neutrons. The crystal Cs2LiYCI6:Ce contains Li-6 and Cl-35 isotopes, therefore, it is possible to detect thermal neutrons through the reaction Li-6 (n, alpha)t while Cl-35 ions allow to measure fast neutrons through the reactions Cl-35(n, p)S-35 and Cl-35(n, alpha)P-32. In this work two CLYC 1" x 1" crystals were used: the first crystal, enriched with Li-6 at 95% (CLYC-6) is ideal for thermal neutron measurements while the second one, enriched with Li-7 at > 99% (CLYC-7) is suitable for fast neutron measurements. The response of CLYC scintillators was measured with different PMT models: timing or spectroscopic, with borosilicate glass or quartz window. The energy resolution, the neutron-gamma discrimination and the internal activity are discussed. The capability of CLYC scintillators to discriminate gamma rays from neutrons was tested with both thermal and fast neutrons. The thermal neutrons were measured with both detectors, using an AmBe source. The measurements of fast neutrons were performed at the Frascati Neutron Generator facility (Italy) where a deuterium beam was accelerated on a deuterium or on a tritium target, providing neutrons of 2.5 MeV or 14.1 MeV, respectively. The different sensitivity to thermal and fast neutrons of a CLYC-6 and of a CLYC-7 was additionally studied. (C) 2015 Elsevier B.V. All rights reserved.

Published
2016

19. Preliminary investigation of scintillator materials properties: SrI 2 :Eu, CeBr 3 and GYGAG:Ce for gamma rays up to 9 MeV

Author

B. Million, N. Blasi, Agnese Giaz, S. Brambilla, G. Hull, F. Camera, Simone Coelli, Nerine J. Cherepy, V. Fossati, Stefano Riboldi, Institut de Physique Nucléaire d'Orsay (IPNO), and 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)

Subjects
Nuclear and High Energy Physics, Gamma raysy, 02 engineering and technology, Scintillator, Gamma Spectroscopy, Scitillator detectors, Instrumentation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Collimated light, Crystal, Optics, 0103 physical sciences, Gamma spectroscopy, ComputingMilieux_MISCELLANEOUS, Physics, Range (particle radiation), 010308 nuclear & particles physics, business.industry, Resolution (electron density), Gamma ray, 021001 nanoscience & nanotechnology, Full width at half maximum, 0210 nano-technology, business
Abstract

In this work we measured the performance of a 2ʺ×2ʺ cylindrical tapered crystal of SrI 2 :Eu, a 2ʺ×3ʺ cylindrical sample of CeBr 3 and a 2ʺ×0.3ʺ cylindrical sample of GYGAG:Ce. These scintillators are prototypes in volume or material and were provided by the Lawrence Livermore National Laboratory and by the Institut de Physique Nucleaire d׳Orsay. The gamma-ray energy resolution was measured in the energy range of 0.1–9 MeV using different sources. Each scintillator was scanned along x , y and z axes, using a 400 MBq collimated 137 Cs source. Owing to the GYGAG:Ce thickness, it was not possible to obtain the value of the energy resolution at 9 MeV and to scan the crystal along the z axis. The 662 keV full energy peak position and its FWHM were measured relative to the full energy peaks positions produced by a non-collimated 88 Y source. The signals of the detectors were additionally digitized and compared, up to 9 MeV, using a 12 bit LeCroy 600 MHz oscilloscope.

Published
2015
Full Text
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20. Is Seniority a Partial Dynamic Symmetry in the First $\nu g_{9/2}$ Shell?

Author

Takaharu Otsuka, Toshiyuki Sumikama, Ryo Taniuchi, Giuseppe Lorusso, Zsolt Podolyak, R. Avigo, István Kuti, G. de Angelis, Shunji Nishimura, A. I. Morales, Nunzio Itaco, P. A. Söderström, D. R. Napoli, A. Gottardo, Yusuke Tsunoda, N. Blasi, Stephen Rice, Zena Patel, P. Van Isacker, Rin Yokoyama, I. Kojouharov, G. Benzoni, V. Modamio-Hoybjor, Jinguang Wu, Zs. Dombradi, F. Browne, F. L. Bello Garrote, T. Isobe, Jan Taprogge, E. Sahin, S. Lalkovski, Satoru Momiyama, L. Coraggio, N. Kurz, Hiroyoshi Sakurai, Tsuyoshi Miyazaki, P. Doornenbal, Oliver Wieland, M. Yalcinkaya, B. Melon, Ayumi Yagi, R. Daido, F. Camera, R. Orlandi, P. H. Regan, Y. F. Fang, A. Gargano, Hirofumi Watanabe, K. Matsui, H. Schaffner, D. Mengoni, F. C. L. Crespi, M. C. Delattre, J. J. Valiente-Dobón, A. Bracco, H. Baba, Zs. Vajta, Dóra Sohler, S. Ceruti, Megumi Niikura, Zhengyu Xu, Alison Bruce, L. Sinclair, 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 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 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 ), Morales, A. I., Benzoni, G., Watanabe, H., de Angelis, G., Nishimura, S., Coraggio, L., Gargano, A., Itaco, N., Otsuka, T., Tsunoda, Y., Van Isacker, P., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P. -A., Sumikama, T., Valiente-Dobón, J. J., Wu, J., Xu, Z. Y., Yagi, A., Yokoyama, R., Baba, H., Avigo, R., Bello Garrote, F. L., Blasi, N., Bracco, A., Bruce, A. M., Camera, F., Ceruti, S., Crespi, F. C. L., Delattre, M. -C., Dombradi, Zs., Gottardo, A., Isobe, T., Kojouharov, I., Kurz, N., Kuti, I., Lalkovski, S., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D. R., Niikura, M., Orlandi, R., Podolyák, Zs., Regan, P. H., Sakurai, H., Sahin, E., Sohler, D., Schaffner, H., Taniuchi, R., Taprogge, J., Vajta, Zs., Wieland, O., Yalcinkaya, M., 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), and 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)

Subjects
Nuclear and High Energy Physics, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 29.30.Kv, 23.40.-s, Nuclear physics, 21.60.Cs, 0103 physical sciences, Neutron, Seniority, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th], Spin-½, Physics, 010308 nuclear & particles physics, 23.20.Lv, Fermion, Quantum number, lcsh:QC1-999, Atomic physics, Nucleon, lcsh:Physics, Radioactive decay
Abstract

The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni. The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni. ispartof: Physics Letters B vol:781 pages:706-712 status: published

Published
2018

21. Fast neutron detection efficiency of 6Li and 7Li enriched CLYC scintillators using an Am-Be source

Author

Agnese Giaz, Flavia Groppi, Luigi Gini, A. Mentana, Simone Manenti, Benedicte Million, N. Blasi, Stefano Riboldi, S. Ceruti, S. Brambilla, and F. Camera

Subjects
Materials science, Physics - Instrumentation and Detectors, Isotopes of lithium, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Analytical chemistry, FOS: Physical sciences, Scintillator, 01 natural sciences, Particle detector, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, 0103 physical sciences, Neutron detection, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Mathematical Physics, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), Neutron temperature, Scintillation counter, Neutron source
Abstract

The fast neutrons produced by a calibrated 241Am-Be source were detected by two different Cs2LiYCl6:Ce (CLYC) scintillator detectors. The two cylindrical crystals (1''× 1'' in size) were enriched with more than 99% of 7Li (C7LYC) and with about 95% of 6Li (C6LYC), respectively. Both crystals can detect fast neutrons whereas only C6LYC can also detect thermal neutrons, due to the presence of 6Li. The measurement was performed at the L.A.S.A . Laboratory of INFN and University of Milano (Italy). To identify the neutron events, the Pulse-Shape-Discrimination technique was used. The values of 1.41 ± 0.16 for C6LYC and 1.16 ± 0.21 for C7LYC for the detection efficiency of the 241Am-Be emitted neutrons, with energy up to 10 MeV, were deduced.

Published
2018

23. High-Resolution Gamma-Ray Spectroscopy with a SiPM-Based Detection Module for 1' and 2' LaBr3:Ce Readout

Author

Benedicte Million, Giulia Cozzi, Claudio Piemonte, G. L. Montagnani, F. Camera, N. Blasi, Carlo Fiorini, Alberto Gola, Marco Carminati, Fabio Acerbi, Paolo Busca, V. Regazzoni, and Giovanni Paternoster

Subjects
010302 applied physics, Physics, Photomultiplier, Nuclear and High Energy Physics, 010308 nuclear & particles physics, business.industry, Detector, Gamma ray, Photodetector, Scintillator, 01 natural sciences, Cerium-doped lanthanum bromide (LaBrâ:ce), gamma-ray spectroscopy, nuclear physics, photomultiplier tube (PMT), silicon photomultiplier (SIPM), Nuclear Energy and Engineering, Electrical and Electronic Engineering, Optics, Silicon photomultiplier, 0103 physical sciences, Gamma spectroscopy, business, Energy (signal processing)
Abstract

In this paper, we present a silicon photomultiplier (SiPM)-based photodetector module designed to readout large cerium-doped lanthanum bromide (LaBr3:Ce) scintillators (cylindrical 1” $\times$ 1” and 2” $\times$ 2”) for nuclear physics experiments. The detector prototype has a modular structure and implements a real-time stabilization of the SiPM gain to compensate for the gain drift with temperature. The SiPM module consists of an array of 5 by 6 near-ultraviolet high-density SiPMs (Fondazione Bruno Kessler, Italy), each one having an active area of 6 mm $\times$ 6 mm and 30- $\mu \text{m}$ microcells. The single array is used for the 1” crystal readout, and it is assembled in a $2{\times} 2$ format to read the 2” scintillator. Spectroscopic measurements were performed with both crystals. The 2” crystal was irradiated with different radioactive sources in an energy range between 122 keV and 1.3 MeV, and an energy resolution of 3.19 ± 0.01% full-width at half-maximum (FWHM) has been achieved at 662 keV. The result is very close to the 3.07 ± 0.03% FWHM measured with Super Bialkali photomultiplier tube (PMT) (Hamamatsu R6233-100) at the same energy with the same 2” crystal. In the framework of the comparison between SiPM and PMT for LaBr3:Ce readout, we provide an analysis of the energy resolution contributions based on the measurements performed with the developed gamma-ray detection system.

Published
2018

25. Gamma decay of pygmy states in $^{90,94}$Zr from inelastic scattering of light ions

Author

D. Montanari, L. Morris, Y. D. Fang, M. Spieker, Takeshi Koike, Johann Isaak, P. J. Davies, B. Wasilewska, T. Klaus, Deniz Savran, Shumpei Noji, C. Sullivan, G. Gey, O. Wieland, M. Kumar Raju, J. J. Carroll, G. Steinhilber, S. Zhu, T. H. Hoang, A. Czeszumska, X. K. Zhou, A. Inoue, S. G. Pickstone, N. Ichige, D. G. Jenkins, A. S. Brown, Atsushi Tamii, Nobumichi Kobayashi, Tetsuya Yamamoto, Nori Aoi, N. Blasi, F. Camera, A. Bracco, V. Werner, A. Maj, M. L. Liu, O. H. Jin, Eiji Ideguchi, M. P. Carpenter, C. Iwamoto, Yasuo Yamamoto, H. Fujita, S. Bassauer, M. Krzysiek, M. Ciemala, F. C. L. Crespi, L. M. Donaldson, D. L. Balabanski, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, History, Scintillation, Spectrometer, 010308 nuclear & particles physics, Gamma ray, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Resonance (particle physics), Computer Science Applications, Education, Ion, Nuclear physics, Dipole, 0103 physical sciences, ddc:530, 010306 general physics, Hpge detector, Nuclear Experiment
Abstract

International audience; We performed experiments to study the low-energy part of the E1 response (Pygmy Dipole Resonance) in $^{90,94}$Zr nuclei, by measuring the (p,p’γ) and (α,α’γ) inelastic scattering reactions at energies Ebeam,p = 80 MeV and Ebeam,α = 130 MeV respectively. The inelastically scattered particles were measured by employing the high-resolution spectrometer Grand Raiden. The gamma-rays emitted following the de-excitation of the Zr target nuclei were detected using both the clover type HPGe detectors of the CAGRA array and the large volume LaBr3:Ce scintillation detectors from the HECTOR+ array. Some preliminary results are presented here.

Published
2017

26. A SiPM-Based Detection Module for 2' LaBr3:Ce Readout for Nuclear Physics Applications

Author

Alberto Gola, Giovanni Paternoster, Marco Carminati, Fabio Acerbi, Paolo Busca, Carlo Fiorini, L. Buonanno, Claudio Piemonte, Benedicte Million, G. L. Montagnani, N. Blasi, Veronica Regazzoni, F. Camera, and Giulia Cozzi

Subjects
010302 applied physics, Physics, Photomultiplier, 010308 nuclear & particles physics, Instrumentation, Resolution (electron density), Scintillator, 01 natural sciences, Nuclear physics, Silicon photomultiplier, 0103 physical sciences, Calibration, Spectroscopy, Blue light
Abstract

We present a SiPM-based gamma-ray detection module, which allows to read large LaBr 3 :Ce cylindrical crystals (diameter > 1”), typically adopted in nuclear physics experiments, with spectroscopic performances similar to those achievable with PMTs. High-Density SiPM technology for Near UltraViolet and blue light detection (NUV-HD, Fondazione Bruno Kessler, Italy) were used. These SiPMs show high Photo Detection Efficiency (PDE = 45% at 380 nm) and low Dark Count Rate (DCR 3 :Ce irradiated with 57C, 133Ba, 137Cs and 60Co calibration sources. An energy resolution of 3.19 ± 0.01% was achieved at 662 keV with 2” LaBr 3 :Ce. The same crystal was tested with a Super Bialkali PMT (Hamamatsu R6233-100) showing a similar energy resolution of 3.07 ± 0.03% at 662 keV. Therefore, these results support the equivalence between SiPM and PMT for high-resolution spectroscopy.

Published
2017

27. Investigation on gamma-ray position sensitivity at 662 keV in a spectroscopic 3' x 3' LaBr3:Ce scintillator

Author

A. Giaz, B. Million, Stefano Riboldi, S. Brambilla, Simone Coelli, A. Marone, F. Camera, O. Wieland, F. Birocchi, Carlo Fiorini, C. Boiano, and N. Blasi

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Doppler broadening, Imaging, LaBr3:Ce scintillators, Position sensitivity, Instrumentation, sezele, business.industry, Detector, Gamma ray, Scintillator, Collimated light, Crystal, Full width at half maximum, Optics, Position (vector), business
Abstract

The position sensitivity of a thick, cylindrical and continuous 3” x 3” (7.62 cm x 7.62 cm) LaBr3:Ce crystal was studied using a 1 mm collimated beam of 662 keV gamma rays from a 400 MBq intense 137Cs source and a spectroscopic photomultiplier (PMT) (HAMAMATSU R6233-100SEL). The PMT entrance window was covered by black absorber except for a small window 1 cm x 1 cm wide. A complete scan of the detector over a 0.5 cm step grid was performed for three positions of the 1 cm x 1 cm window. For each configuration the energy spectrum was measured and the peak centroid, the FWHM, the area and peak asymmetry of the 662 keV gamma transition were analyzed. The data show that, even in a 3” thick LaBr3:Ce crystal with diffusive surfaces the position of the full energy peak centroid depends on the source position. We verified that, on average, the position of the full energy peak centroids measured in the three 1 cm x 1 cm window configurations is sufficient for the correct identification of the collimated gamma source position.

Published
2015

28. 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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29. Experimental study of the isovector giant dipole resonance in Zr80 and Rb81

Author

C. A. Ur, R. Nicolini, D. Bazzacco, F. Recchia, M. Kmiecik, A. Bracco, A. Giaz, D. Mengoni, S. Brambilla, G. Benzoni, A. Gottardo, S. Bottoni, N. Blasi, E. Sahin, S. Ceruti, S. Leoni, Stefano Riboldi, V. Modamio, R. Avigo, G. Bocchi, D. R. Napoli, D. Montanari, B. Million, F. C. L. Crespi, A. I. Morales, Oliver Wieland, E. Farnea, C. Michelagnoli, M. Ciemala, J. J. Valiente-Dobón, Luna Pellegri, B. Wasilewska, M. Zieblinski, F. Camera, A. Maj, and A. Mentana

Subjects
Physics, Isovector, 010308 nuclear & particles physics, Nuclear Theory, Resonance, 01 natural sciences, Dipole, Nuclear magnetic resonance, 0103 physical sciences, Coulomb, Nuclear fusion, AGATA, Atomic physics, Nuclear Experiment, 010306 general physics, Energy (signal processing), Excitation
Abstract

The isovector giant dipole resonance (IVGDR) $\ensuremath{\gamma}$ decay was measured in the compound nuclei $^{80}\mathrm{Zr}$ and $^{81}\mathrm{Rb}$ at an excitation energy of ${E}^{*}=54$ MeV. The fusion reaction $^{40}\mathrm{Ca}+^{40}\mathrm{Ca}$ at ${E}_{\mathrm{beam}}=136$ MeV was used to form the compound nucleus $^{80}\mathrm{Zr}$, while the reaction $^{37}\mathrm{Cl}+^{44}\mathrm{Ca}$ at ${E}_{\mathrm{beam}}=95$ MeV was used to form the compound nucleus $^{81}\mathrm{Rb}$ at the same excitation energy. The IVGDR parameters extracted from the analysis were compared with the ones found at higher excitation energy (${E}^{*}=83$ MeV). The comparison allows one to observe two different nuclear mechanisms: (i) the IVGDR intrinsic width remains constant with the excitation energy in the nucleus $^{81}\mathrm{Rb}$; (ii) the isospin-violating spreading width (i.e., Coulomb spreading width) remains constant with the excitation energy in the nucleus $^{80}\mathrm{Zr}$. The experimental setup used for the $\ensuremath{\gamma}$-ray detection was composed by the AGATA demonstrator array coupled to the large-volume ${\mathrm{LaBr}}_{3}$:Ce detectors of the ${\mathrm{HECTOR}}^{+}$ array.

Published
2017

30. Constraining Hot Sources in Central Heavy-ion Collisions Below 20 MeV/$u$

Author

B. Fornal, Alessandro Olmi, O. V. Fotina, G. Prete, Luca Morelli, J. Mabiala, D. Fabris, Emanuele Vardaci, Maurizio Bini, M. D'Agostino, B. Szpak, S. Leoni, Giorgio Baiocco, Simone Valdré, A. Maj, Giovanni Casini, Maria Colonna, Magda Cicerchia, S. Myalski, B. Million, S. Brambilla, F. C. L. Crespi, M. Kmiecik, M. Zieblinski, A. Bracco, Gabriele Pasquali, M. Bruno, Sandro Barlini, A. Giaz, F. Camera, W. Meczynski, G. Benzoni, O. Wieland, M. Matejska-Minda, V. L. Kravchuk, B. Wasilewska, R. Nicolini, N. Blasi, Silvia Piantelli, F. Gramegna, Tommaso Marchi, K. Mazurek, J. Styczen, S. Appannababu, D. Montanari, M. Degerlier, M. Cinausero, M. Krzysiek, M. Ciemala, P. Bednarczyk, Valdré, S., Piantelli, S., Casini, G., Barlini, S., Ciemała, M., Kmiecik, M., Maj, A., Mazurek, K., Cinausero, M., Gramegna, F., Kravchuk, V. L., Morelli, L., Marchi, T., Appannababu, S., Baiocco, G., Bednarczyk, P., Benzoni, G., Bini, M., Blasi, N., Bracco, A., Brambilla, S., Bruno, M., Camera, F., Cicerchia, M., Colonna, M., Crespi, F. C. L., D'Agostino, M., Degerlier, M., Fabris, D., Fornal, B., Fotina, O. V., Giaz, A., Krzysiek, M., Leoni, S., Mabiala, J., Matejska Minda, M., Męczyński, W., Million, B., Montanari, D., Myalski, S., Nicolini, R., Olmi, A., Pasquali, G., Prete, G., Styczeń, J., Szpak, B., Vardaci, Emanuele, Wasilewska, B., Wieland, O., and Ziębliński, M.

Subjects
Nuclear physics, Physics, Physics and Astronomy (all), General Physics and Astronomy, Heavy ion
Abstract

Pre-equilibrium emissions affect the production of excited systems in nuclear reactions, thus modifying their properties which enter as input parameters in the comparison with statistical models. In this contribution, we discuss this subject referring to recent results from experiments performed at Legnaro National Laboratories (Italy) with the GARFIELD apparatus complemented with other detectors. ispartof: Acta Physica Polonica B vol:48 issue:3 pages:635-639 ispartof: location:Zakopane: POLAND status: published

Published
2017
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31. Low-energy enhancement and fluctuations of γ-ray strength functions in 56,57Fe: test of the Brink–Axel hypothesis

Author

S. J. Rose, Trine Wiborg Hagen, Gry Merete Tveten, L. Crespo Campo, V. W. Ingeberg, Tamas Gabor Tornyi, T. K. Eriksen, B. Million, I. E. Ruud, F. Camera, Hilde-Therese Nyhus, Andreas Görgen, Alexander Voinov, Therese Renstrøm, S. Leoni, Magne Guttormsen, J. E. Midtbø, A. Bracco, Sunniva Siem, N. Blasi, M. Wiedeking, A. C. Larsen, Fabio Zeiser, and B. V. Kheswa

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Strength function, Astrophysics::High Energy Astrophysical Phenomena, Resolution (electron density), Gamma ray, Function (mathematics), 01 natural sciences, Dipole, Low energy, 0103 physical sciences, Atomic physics, 010306 general physics, Nuclear Experiment, Excitation, Energy (signal processing)
Abstract

Nuclear level densities and $\gamma$-ray strength functions of $^{56,57}$Fe have been extracted from proton-$\gamma$ coincidences. A low-energy enhancement in the $\gamma$-ray strength functions up to a factor of 30 over common theoretical E1 models is confirmed. Angular distributions of the low-energy enhancement in $^{57}$Fe indicate its dipole nature, in agreement with findings for $^{56}$Fe. The high statistics and the excellent energy resolution of the large-volume LaBr$_{3}$(Ce) detectors allowed for a thorough analysis of $\gamma$ strength as function of excitation energy. Taking into account the presence of strong Porter-Thomas fluctuations, there is no indication of any significant excitation-energy dependence in the $\gamma$-ray strength function, in support of the generalized Brink-Axel hypothesis., Comment: 24 pages, 17 figures, accepted for publication in J. Phys. G: Nucl. Phys; Special Issue

Published
2017

32. Excitation of the dynamical dipole in the charge asymmetric reaction 16O+116Sn

Author

S. Leoni, Ariane Laura Lanchais, A. Maj, V. Baran, F. Gramegna, A. Ordine, P. F. Mastinu, Maria Colonna, D. Montanari, M. Di Toro, M. Brekiesz, M. Kmiecik, F. C. L. Crespi, A. Moroni, E. Geraci, N. Blasi, O. Wieland, V. L. Kravchuk, S. Brambilla, C. Rizzo, A. Bracco, M. Bruno, M. D'Agostino, G. Benzoni, Massimo Chiari, A. Giussani, Giovanni Casini, G. Vannini, A. Corsi, Sandro Barlini, F. Camera, A. Nannini, B. Million, A. Corsi, O. Wieland, V.L. Kravchuk, A. Bracco, F. Camera, G. Benzoni, N. Blasi, S. Brambilla, F.C.L. Crespi, A. Giussani, S. Leoni, B. Million, D. Montanari, A. Moroni, F. Gramegna, A. Lanchai, P. Mastinu, M. Brekiesz, M. Kmiecik, A. Maj, M. Bruno, M. D’Agostino, E. Geraci, G. Vannini, S. Barlini, G. Casini, M. Chiari, A. Nannini, A. Ordine, M. Di Toro, C. Rizzo, M. Colonna, and V. Baran

Subjects
NUCLEAR REACTIONS, Nuclear reaction, Physics, Nuclear and High Energy Physics, FUSION DYNAMICS, Gamma ray, SYMMETRY TERM OF THE EQUATION OF STATE, Charged particle, GIANT DIPOLE RESONANCE, Dipole, DYNAMICAL DIPOLE, Yield (chemistry), Atomic physics, Nucleon, Nuclear Experiment, Beam (structure), Excitation
Abstract

The γ -ray emission from the dynamical dipole formed in heavy-ion collisions during the process leading to fusion was measured for the N/Z asymmetric reaction 16 O + 116 Sn at beam energies of 8.1 and 15.6 MeV/nucleon. High-energy γ -rays and charged particles were measured in coincidence with the heavy recoiling residual nuclei. The data are compared with those from the N/Z symmetric reaction 64 Ni + 68 Zn at bombarding energies of 4.7 and 7.8 MeV/nucleon, leading to the same CN with the same excitation energies as calculated from kinematics. The measured yield of the high-energy γ -rays from the 16 O-induced reaction is found to exceed that of the thermalized CN and the excess yield increases with bombarding energy. The data are in rather good agreement with the predictions for the dynamical dipole emission based on the Boltzmann–Nordheim–Vlasov model. In addition, a comparison with existing data in the same mass region is performed to extract information on the dipole moment dependence.

Published
2009
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33. Electron backscattering on Si(Li) detectors and determination of the transmission curve of a Mini-Orange Spectrometer

Author

Leonardo Guerro, Alessandro Saltarelli, and N. Blasi

Subjects
Physics, Nuclear and High Energy Physics, Electron spectrometer, Spectrometer, business.industry, Detector, Monte Carlo method, Electron, Electron spectroscopy, Optics, Transmission curve, Atomic electron transition, Atomic physics, Nuclear Experiment, business, Instrumentation
Abstract

A detailed electron backscattering analysis in Si(Li) detectors was done in order to evaluate the response function of the Mini-Orange Spectrometer. The analysis was performed via Monte Carlo simulations and by measuring the energy and the angular dependencies without and with the insertion of the Mini-Orange Spectrometer in the detection system, combining data taken with a continuous β− source (90Sr) with those from discrete electron transitions of an electron conversion source (207Bi). A simple but accurate method is described to determine the transmission function T(E) of the Mini-Orange.

Published
2014

34. Study of the Isospin Symmetry in $^{60}$Zn

Author

D. Bazzacco, M. Siciliano, M. Kmiecik, S. Leoni, G. de Angelis, G. Jaworski, A. Bracco, V. Zamfir, O. Wieland, S. Ceruti, O. Poleshchuk, N. Blasi, M. Ciemala, R. Raabe, D. R. Napoli, S. Brambilla, M. Zieblinski, A. Boso, A. Mentana, G. Bocchi, Agnese Giaz, G. Gosta, F. Camera, B. Million, D. M. Filipescu, D. A. Testov, P. R. John, Alain Goasduff, J. J. Valiente-Dobón, T. Marchi, F. C. L. Crespi, D. Ghita, B. Wasilewska, F. Recchia, Jiecheng Yang, D. Mengoni, G. Benzoni, A. Maj, and F. Galtarossa

Subjects
Physics, Physics and Astronomy (all), Particle physics, Isospin, General Physics and Astronomy, Symmetry (physics)
Abstract

© 2019 Jagellonian University. All Rights Reserved. The breaking of isospin symmetry caused by the Coulomb interaction can be measured by the study of E1 γ decay. The Isovector Giant Dipole Resonance (IVGDR) was measured in 60 Zn and 62 Zn at two different excitation energies E ∗ = 47 MeV and E ∗ = 58 MeV with the goal of deducing the isospin mixing term. A fusion–evaporation reaction, with a beam of 32 S and a target of 28 Si, was used to produce 60 Zn. We also produced the compound nucleus 62 Zn using the reaction 32 S + 30 Si. This last reaction is required because, for the produced nucleus, the statistical model analysis is much less sensitive to the isospin mixing, and this allows to extract the GDR parameters and use them for isospin mixing sensitive reaction populating neighboring nucleus with N = Z. The experimental setup was composed of GALILEO array (germanium detectors) coupled to the large-volume LaBr 3 :Ce detectors for the γ-rays measuring and by two ancillary arrays, EUCLIDES and the Neutron Wall for the detection of particles and neutrons, respectively. An overview on the ongoing analysis and on preliminary results is presented. ispartof: ACTA PHYSICA POLONICA B vol:50 issue:3 pages:481-486 ispartof: location:POLAND, Zakopane status: published

Published
2019

35. Measurement of dynamical dipole γ-ray emission in the N/Z-asymmetric fusion reaction O16+Sn116 at 12 MeV/nucleon

Author

A. Giaz, A. Corsi, S. Barlini, V. L. Kravchuk, O. Wieland, M. Colonna, F. Camera, A. Bracco, R. Alba, G. Baiocco, L. Bardelli, G. Benzoni, M. Bini, N. Blasi, S. Brambilla, G. Casini, M. Ciemala, M. Cinausero, F. C. L. Crespi, M. D’Agostino, M. Degerlier, M. Di Toro, F. Gramegna, M. Kmiecik, S. Leoni, C. Maiolino, A. Maj, T. Marchi, K. Mazurek, S. Myalski, B. Million, D. Montanari, R. Nicolini, G. Pasquali, S. Piantelli, A. Ordine, G. Poggi, V. Rizzi, C. Rizzo, S. Sambi, D. Santonocito, V. Vandone, BRUNO, MAURO, MORELLI, LUCA, A. Giaz, A. Corsi, S. Barlini, V. L. Kravchuk, O. Wieland, M. Colonna, F. Camera, A. Bracco, R. Alba, G. Baiocco, L. Bardelli, G. Benzoni, M. Bini, N. Blasi, S. Brambilla, M. Bruno, G. Casini, M. Ciemala, M. Cinausero, F. C. L. Crespi, M. D’Agostino, M. Degerlier, M. Di Toro, F. Gramegna, M. Kmiecik, S. Leoni, C. Maiolino, A. Maj, T. Marchi, K. Mazurek, S. Myalski, B. Million, D. Montanari, L. Morelli, R. Nicolini, G. Pasquali, S. Piantelli, A. Ordine, G. Poggi, V. Rizzi, C. Rizzo, S. Sambi, D. Santonocito, and V. Vandone

Subjects
dynamic dipole, Nuclear Theory, FUSION REACTIONS, GAMMA RAY, Nuclear Experiment
Abstract

A new measurement of the dynamical dipole emission was performed in the system O-16 + Sn-116 at 12 MeV/nucleon. These data, together with those measured at 8.1 MeV/nucleon and 15.6 MeV/nucleon on the same system, provide the dependence of the dynamical dipole total emission yield on the beam energy. The energy removed by preequilibrium charged particles emission was directly measured and this made possible the direct estimation of the compound nucleus excitation energy. The experimental results show a weak increase of the dynamical dipole total yield with beam energy and they are in agreement both in trend and in absolute values with the predictions of the theoretical model based on the Boltzmann-Nordheim-Vlasov approach. The measured gamma-ray angular distribution has a dipole character but with a strong quenching probably owing to the rotation of the dipolar axis during the fusion and thermalization processes.

Published
2014

36. Pygmy dipole resonance inCe140via inelastic scattering ofO17

Author

Alberto Pullia, S. Bottoni, A. Jungclaus, D. Bazzacco, C. A. Ur, J. Eberth, J. Ljungvall, N. Blasi, P. Reiter, M. Kmiecik, F. Recchia, A. Giaz, Herbert Hess, S. Lunardi, A. Maj, R. Menegazzo, A. Gottardo, B. Siebeck, Elena Litvinova, Oliver Wieland, E. G. Lanza, G. de Angelis, A. Bracco, Nils Paar, R. Avigo, M. Krzysiek, M. Ciemala, K. Mazurek, E. Farnea, P. Bednarczyk, S. Leoni, G. Benzoni, R Isocarte, A. I. Morales, Begoña Quintana, F. C. L. Crespi, B. Birkenbach, C. Michelagnoli, D. Rosso, R. Nicolini, M. D. Salsac, P. Désesquelles, A. Gadea, D. Mengoni, B Milion, S. Ceruti, S. Brambilla, P. A. Söderström, D. R. Napoli, F. Camera, M. Zieblinski, J. Grebosz, Andreas Görgen, J. J. Valiente-Dobón, Luna Pellegri, and Sunniva Siem

Subjects
Physics, 010308 nuclear & particles physics, Isoscalar, Form factor (quantum field theory), Inelastic scattering, 01 natural sciences, 7. Clean energy, Resonance (particle physics), Dipole, Excited state, 0103 physical sciences, Neutron, Atomic physics, Born approximation, 010306 general physics
Abstract

The γ decay from the high-lying states of ^140Ce excited via inelastic scattering of ^17O at a bombarding energy of 340 MeV was measured using the high-resolution AGATA-demonstrator array in coincidence with scattered ions detected in two segmented Δ E-E silicon detectors. Angular distributions of scattered ions and emitted γ rays were measured, as well as their differential cross sections. The excitation of 1^− states below the neutron separation energy is similar to the one obtained in reactions with the α isoscalar probe. The comparison between the experimental differential cross sections and the corresponding predictions using the distorted-wave Born approximation allowed us to extract the isoscalar component of identified 1^− pygmy states. For this analysis the form factor obtained by folding microscopically calculated transition densities and optical potentials was used.

Published
2016

37. Charged particle decay of hot and rotatingMo88nuclei in fusion-evaporation reactions

Author

R. Nicolini, Giorgio Baiocco, Giovanni Casini, T. Marchi, Gabriele Pasquali, Sandro Barlini, M. Kmiecik, A. Bracco, O. Wieland, M. Bruno, P. Bednarczyk, B. Szpak, M. Matejska-Minda, G. Benzoni, S. Carboni, S. Brambilla, F. Gramegna, J. Styczen, A. Chbihi, Alessandra Corsi, Luca Morelli, D. Fabris, A. Olmi, A. Giaz, L. Bardelli, A. Maj, N. Blasi, Oliver J. Roberts, M. Cinausero, W. Meczynski, Silvia Piantelli, S. Leoni, Simone Valdré, J.P. Wieleczko, D. Montanari, M. Zieblinski, S. Myalski, K. Mazurek, F. Camera, M. Degerlier, M. Krzysiek, M. Ciemala, M. D'Agostino, B. Wasilewska, Maurizio Bini, F. C. L. Crespi, G. Prete, V. L. Kravchuk, I. Mazumdar, B. Million, and B. Fornal

Subjects
Physics, Nuclear and High Energy Physics, Fusion, 010308 nuclear & particles physics, Evaporation, Inelastic collision, 01 natural sciences, Charged particle, medicine.anatomical_structure, 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Nucleus, Beam (structure), Excitation
Abstract

A study of fusion-evaporation and (partly) fusion-fission channels for the $^{88}$Mo compound nucleus, produced at different excitation energies in the reaction $^{48}$Ti + $^{40}$Ca at 300, 450 and 600 MeV beam energies, is presented. Fusion-evaporation and fusion-fission cross sections have been extracted and compared with the existing systematics. Experimental data concerning light charged particles have been compared with the prediction of the statistical model in its implementation in the Gemini++ code, well suited even for high spin systems, in order to tune the main model parameters in a mass region not abundantly covered by exclusive experimental data. Multiplicities for light charged particles emitted in fusion evaporation events are also presented. Some discrepancies with respect to the prediction of the statistical model have been found for forward emitted $\alpha$-particles; they may be due both to pre-equilibrium emission and to reaction channels (such as Deep Inelastic Collisions, QuasiFission/QuasiFusion) different from the compound nucleus formation.

Published
2016

38. Position sensitivity in large spectroscopic LaBr3:Ce crystals for Doppler broadening correction

Author

Stefano Riboldi, Agnese Giaz, S. Brambilla, N. Blasi, C. Boiano, F. Camera, and B. Million

Subjects
Physics, Photomultiplier, Nuclear and High Energy Physics, Doppler broadening, Imaging, LaBr3:Ce scintillators, Position sensitivity, Instrumentation, 010308 nuclear & particles physics, business.industry, Gamma ray, Measure (physics), Phosphor, 01 natural sciences, Electromagnetic radiation, Crystal, Optics, Position (vector), 0103 physical sciences, Atomic physics, 010306 general physics, business
Abstract

The position sensitivity of a large LaBr 3 :Ce crystal was investigated with the aim of correcting for the Doppler broadening in nuclear physics experiments. The crystal was cylindrical, 3 in×3 in (7.62 cm x 7.62 cm) and with diffusive surfaces as typically used in nuclear physics basic research to measure medium or high energy gamma rays (0.5 MeV γ

Published
2016

39. Fast neutron measurements with7Li and6Li enriched CLYC scintillators

Author

A. Giaz, F. Salamida, S. Brambilla, A. Mentana, C. Cattadori, F. Camera, Luna Pellegri, B. Million, C. Boiano, S. Ceruti, Marica Rebai, Stefano Riboldi, I Mattei, N. Blasi, M. Tardocchi, Tommaso Marchi, and F. Gramegna

Subjects
Physics, Scintillation, Nuclear and High Energy Physics, Gamma-ray detector, CLYC Scintillator detector, Fast neutron measurement, Neutron detection, Instrumentation, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Resolution (electron density), Gamma ray, Scintillator, 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron, 010306 general physics, Gamma energy
Abstract

The recently developed Cs2LiYCl6:Ce (CLYC) crystals are interesting scintillation detectors not only for their gamma energy resolution (

Published
2016

40. Gamma decay of the possible 1- two-phonon state in 140Ce excited via inelastic scattering of 17O

Author

B. Siebeck, S. Bottoni, A. Gadea, E. Farnea, N. Blasi, S. Ceruti, F. Camera, A. Bracco, K. Mazurek, Andreas Görgen, B. Birkenbach, F. Recchia, G. Benzoni, J. J. Valiente-Dobón, S. Leoni, E. G. Lanza, R. Avigo, Luna Pellegri, A. Maj, S. Lunardi, C. A. Ur, A. Giaz, A. Gottardo, A. I. Morales, B. Million, R. Nicolini, Sunniva Siem, Roberto Isocrate, F. C. L. Crespi, P. Bednarczyk, D. R. Napoli, D. Bazzacco, G. de Angelis, M. Krzysiek, M. Ciemala, M. Kmiecik, O. Wieland, D. Mengoni, C. Michelagnoli, M. Zieblinski, and J. Grebosz

Subjects
Physics, Physics and Astronomy (all), Phonon, Excited state, Gamma ray, General Physics and Astronomy, State (functional analysis), Inelastic scattering, Atomic physics
Published
2016

41. 3″ × 3″ LaBr3:Ce position sensitivity with multi-anode PMT readout

Author

Stefano Riboldi, S. Brambilla, N. Blasi, C. Boiano, A. Giaz, F. Camera, and B. Million

Subjects
Physics, Photomultiplier, Nuclear and High Energy Physics, Radiology, Nuclear Medicine and Imaging, Physics::Instrumentation and Detectors, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Physics::Medical Physics, Detector, Gamma ray, Collimated light, Anode, Crystal, Radiology, Nuclear Medicine and Imaging, Optics, Position (vector), Physics::Accelerator Physics, business, Sensitivity (electronics)
Abstract

The response of a cylindrical continuous 3″ × 3″ LaBr3:Ce crystal coupled to four Position Sensitive photomultipliers (PSPMT) was studied using a 1 mm collimated beam of 662 keV gamma rays.

Published
2016

42. Nuclear astrophysics with radioactive ions at FAIR

Author

R Reifarth, S Altstadt, K Göbel, T Heftrich, M Heil, A Koloczek, C Langer, R Plag, M Pohl, K Sonnabend, M Weigand, T Adachi, F Aksouh, J Al-Khalili, M AlGarawi, S AlGhamdi, G Alkhazov, N Alkhomashi, H Alvarez-Pol, R Alvarez-Rodriguez, V Andreev, B Andrei, L Atar, T Aumann, V Avdeichikov, C Bacri, S Bagchi, C Barbieri, S Beceiro, C Beck, C Beinrucker, G Belier, D Bemmerer, M Bendel, J Benlliure, G Benzoni, R Berjillos, D Bertini, C Bertulani, S Bishop, N Blasi, T Bloch, Y Blumenfeld, A Bonaccorso, K Boretzky, A Botvina, A Boudard, P Boutachkov, I Boztosun, A Bracco, S Brambilla, J Briz Monago, M Caamano, C Caesar, F Camera, E Casarejos, W Catford, J Cederkall, B Cederwall, M Chartier, A Chatillon, M Cherciu, L Chulkov, P Coleman-Smith, D Cortina-Gil, F Crespi, R Crespo, J Cresswell, M Csatlós, F Déchery, B Davids, T Davinson, V Derya, P Detistov, P Diaz Fernandez, D DiJulio, S Dmitry, D Doré, J Dueñas, E Dupont, P Egelhof, I Egorova, Z Elekes, J Enders, J Endres, S Ershov, O Ershova, B Fernandez-Dominguez, A Fetisov, E Fiori, A Fomichev, M Fonseca, L Fraile, M Freer, J Friese, M G. Borge, D Galaviz Redondo, S Gannon, U Garg, I Gasparic, L Gasques, B Gastineau, H Geissel, R Gernhäuser, T Ghosh, M Gilbert, J Glorius, P Golubev, A Gorshkov, A Gourishetty, L Grigorenko, J Gulyas, M Haiduc, F Hammache, M Harakeh, M Hass, M Heine, A Hennig, A Henriques, R Herzberg, M Holl, A Ignatov, A Ignatyuk, S Ilieva, M Ivanov, N Iwasa, B Jakobsson, H Johansson, B Jonson, P Joshi, A Junghans, B Jurado, G Körner, N Kalantar, R Kanungo, A Kelic-Heil, K Kezzar, E Khan, A Khanzadeev, O Kiselev, M Kogimtzis, D Körper, S Kräckmann, T Kröll, R Krücken, A Krasznahorkay, J Kratz, D Kresan, T Krings, A Krumbholz, S Krupko, R Kulessa, S Kumar, N Kurz, E Kuzmin, M Labiche, K Langanke, I Lazarus, T Le Bleis, C Lederer, A Lemasson, R Lemmon, V Liberati, Y Litvinov, B Löher, J Lopez Herraiz, G Münzenberg, J Machado, E Maev, K Mahata, D Mancusi, J Marganiec, M Martinez Perez, V Marusov, D Mengoni, B Million, V Morcelle, O Moreno, A Movsesyan, E Nacher, M Najafi, T Nakamura, F Naqvi, E Nikolski, T Nilsson, C Nociforo, P Nolan, B Novatsky, G Nyman, A Ornelas, R Palit, S Pandit, V Panin, C Paradela, V Parkar, S Paschalis, P Pawłowski, A Perea, J Pereira, C Petrache, M Petri, S Pickstone, N Pietralla, S Pietri, Y Pivovarov, P Potlog, A Prokofiev, G Rastrepina, T Rauscher, G Ribeiro, M Ricciardi, A Richter, C Rigollet, K Riisager, A Rios, C Ritter, T Rodriguez Frutos, J Rodriguez Vignote, M Röder, C Romig, D Rossi, P Roussel-Chomaz, P Rout, S Roy, P Söderström, M Saha Sarkar, S Sakuta, M Salsac, J Sampson, J Sanchez, del Rio Saez, J Sanchez Rosado, S Sanjari, P Sarriguren, A Sauerwein, D Savran, C Scheidenberger, H Scheit, S Schmidt, C Schmitt, L Schnorrenberger, P Schrock, R Schwengner, D Seddon, B Sherrill, A Shrivastava, S Sidorchuk, J Silva, H Simon, E Simpson, P Singh, D Slobodan, D Sohler, M Spieker, D Stach, E Stan, M Stanoiu, S Stepantsov, P Stevenson, F Strieder, L Stuhl, T Suda, K Sümmerer, B Streicher, J Taieb, M Takechi, I Tanihata, J Taylor, O Tengblad, G Ter-Akopian, S Terashima, P Teubig, R Thies, M Thoennessen, T Thomas, J Thornhill, G Thungstrom, J Timar, Y Togano, U Tomohiro, T Tornyi, J Tostevin, C Townsley, W Trautmann, T Trivedi, S Typel, E Uberseder, J Udias, T Uesaka, L Uvarov, Z Vajta, P Velho, V Vikhrov, M Volknandt, V Volkov, P von Neumann-Cosel, M von Schmid, A Wagner, F Wamers, H Weick, D Wells, L Westerberg, O Wieland, M Wiescher, C Wimmer, K Wimmer, J S Winfield, M Winkel, P Woods, R Wyss, D Yakorev, M Yavor, J Zamora Cardona, I Zartova, T Zerguerras, M Zgura, A Zhdanov, M Zhukov, M Zieblinski, A Zilges, K Zuber, 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-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), 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), Helmholtz International Center for FAIR, German Research Foundation, Helmholtz Association, SCOAP, 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 Sciences et Technologies - Bordeaux 1 (UB)-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
History, Astrophysics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Education, Nuclear physics, Subatomär fysik, Nucleosynthesis, 0103 physical sciences, Subatomic Physics, Nuclear astrophysics, Fysik, Neutron, Nuclear Physics - Experiment, ddc:530, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics, Radionuclide, Isotope, rp-process, Computer Science Applications, FAIR nuclear astrophysics radioactive ion beams, Valley of stability, r-process nucleosynthesis, weak-interaction rates, s-process, stars, supernovae, light, Physical Sciences, Facility for Antiproton and Ion Research, Física nuclear, Astrophysics - Instrumentation and Methods for Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], astro-ph.IM
Abstract

R. Reifarth et al: ; 12 págs.; 9 figs.; Open Access funded by Creative Commons Atribution Licence 3.0 ; Nuclear Physics in Astrophysics VI (NPA6), The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those processes, because they are shielded from the s-process ow and r-process -decay chains. These nuclei are attributed to the p and rp process. For all those processes, current research in nuclear astrophysics addresses the need for more precise reaction data involving radioactive isotopes. Depending on the particular reaction, direct or inverse kinematics, forward or time-reversed direction are investigated to determine or at least to constrain the desired reaction cross sections. The Facility for Antiproton and Ion Research (FAIR) will oer unique, unprecedented opportunities to investigate many of the important reactions. The high yield of radioactive isotopes, even far away from the valley of stability, allows the investigation of isotopes involved in processes as exotic as the r or rp processes., This project was supported by the HGF Young Investigators Project VH-NG-327, EMMI, H4F, HGS-HIRe, JINA, NAVI, DFG and ATHENA.

Published
2016

43. Low-lying excitations in Ni 72

Author

Giuseppe Lorusso, T. Isobe, Rin Yokoyama, S. Ceruti, Zhengyu Xu, R. Avigo, H. Shaffner, Ryo Taniuchi, D. Mengoni, J. J. Valiente-Dobón, Stephen Rice, N. Kurz, Zena Patel, K. Matsui, R. Orlandi, Shunji Nishimura, István Kuti, Toshiyuki Sumikama, Megumi Niikura, A. Bracco, Y. F. Fang, E. Sahin, Hirofumi Watanabe, H. Baba, M. Yalcinkaya, G. de Angelis, Ayumi Yagi, D. R. Napoli, Zs. Vajta, P. A. Söderström, Jan Taprogge, Zs. Dombrádi, G. Benzoni, P. Doornenbal, I. Kojouharov, Oliver Wieland, Hiroyoshi Sakurai, L. Sinclair, R. Daido, A. I. Morales, Satoru Momiyama, F. L. Bello Garrote, A. Gottardo, F. Camera, B. Melon, V. Modamio-Hoyborg, F. Browne, M. C. Delattre, Tadashi Miyazaki, Dóra Sohler, Jin Wu, N. Blasi, F. C. L. Crespi, Ministero dell'Istruzione, dell'Università e della Ricerca, National Research Foundation of Korea, Ministry of Science, ICT and Future Planning (South Korea), RIKEN Nishina Center for Accelerator-Based Science, Ministerio de Ciencia e Innovación (España), Hungarian Scientific Research Fund, Japan Society for the Promotion of Science, European Commission, Institut de Physique Nucléaire d'Orsay (IPNO), and 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)

Subjects
Physics, SIMPLE (dark matter experiment), Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Fission, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract

A. I. Morales et al.; 14 págs.; 9 figs.; 3 tabs., Low-lying excited states in Ni72 have been investigated in an in-flight fission experiment at the RIBF facility of the RIKEN Nishina Center. The combination of the state-of-the-art BigRIPS and EURICA setups has allowed for a very accurate study of the β decay from Co72 to Ni72, and has provided first experimental information on the decay sequence Fe72→Co72→Ni72 and on the delayed neutron-emission branch Co73→Ni72. Accordingly, we report nearly 60 previously unobserved γ transitions which deexcite 21 new levels in Ni72. Evidence for the location of the so-sought-after (42+),(62+), and (81+) seniority states is provided. As well, the existence of a low-spin β-decaying isomer in odd-odd neutron-rich Co isotopes is confirmed for mass A=72. The new experimental information is compared to simple shell-model calculations including only neutron excitations across the fpg shells. It is shown that, in general, the calculations reproduce well the observed states. ©2016 American Physical Society, The excellent work of the RIKEN accelerator staff for providing a stable and high-intensity 238U beam is acknowledged. Part of he WAS3ABi was supported by the Rare Isotope Science Project, which is funded by the Ministry of Science, ICT and Future Planning (MSIP) and National Research Foundation (NRF) of Korea. This work is cofinanced by the European Union and the European Social Fund. Support from italian Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale (PRIN) Grant No. 2001024324_01302, the NuPNET-ERANET within the NuPNET GANAS project under Grant Agreement No. 202914, and the European Union within the 7th Framework Program FP7/2007-2013 under Grant Agreement No. 262010 ENSAR-INDESYS is acknowledged. This work was also financed by the Spanish Ministerio de Ciencia e Innovación under ContractsNo. FPA2009-13377-C02 and No. FPA2011-29854-C04, the Hungarian Research Fund OTKA Contract No. K100835 and No. K106035, the European Commission through the Marie Curie Actions Contract No. PIEFGA-2001-30096, and by the Japanese JSPS KAKENHI Grants No. 24740188 and No. 25247045

Published
2016

44. Thermal and fast neutron detection with two CLYC scintillators

Author

Agnese Giaz, Antonino Pietropaolo, Giuseppe Gorini, Luna Pellegri, Benedicte Million, Marco Tardocchi, S. Ceruti, F. Camera, Stefano Riboldi, Carlo Cazzaniga, Massimo Nocente, Mario Pillon, S. Brambilla, Marica Rebai, N. Blasi, Pellegri, L, Giaz, A, Camera, F, Blasi, N, Brambilla, S, Ceruti, S, Million, B, Riboldi, S, Cazzaniga, C, Nocente, M, Gorini, G, Tardocchi, M, Rebai, M, Pietropaolo, A, Pillon, M, Pillon, M., and Pietropaolo, A.

Subjects
radiation detector, Nuclear and High Energy Physics, elpasolites, Radiology, Nuclear Medicine and Imaging, Cs2LiYCl6, gamma-ray detectors, neutron detectors, pulse shape discrimination, radiation detectors, scintillators, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Scintillator, elpasolite, Particle detector, gamma-ray detector, Nuclear physics, Neutron generator, Nuclear Medicine and Imaging, Neutron detection, Neutron, Gamma spectroscopy, Nuclear Experiment, Nuclear and High Energy Physic, Physics, Gamma ray, Neutron temperature, scintillator, neutron detector, Radiology
Abstract

The crystal Cs2LiYCl6:Ce (CLYC) is a very interesting scintillator material because of its excellent energy resolution and its capability to identify gamma rays and fast/thermal neutrons. In this work, the response to gamma, thermal and fast neutrons of two CLYC 1x1 crystals was measured: the first one, enriched with 6Li at 95% is ideal for thermal neutron measurements while the second one, enriched with 7Li at 99% is suitable for fast neutron measurements. The crystals were coupled to quartz window R6231-1000MOD HAMAMATSU PMTs. The thermal neutrons were measured in both detectors using an AmBe source in the gamma spectroscopy laboratory of the University of Milano, Italy. The measurements of fast neutrons were performed at Frascati (Italy) Neutron Generator facility providing neutrons of 14.1 MeV and 2.5 MeV. © 2014 IEEE.

Published
2016

45. Decay properties of 68,69,70Mn: Probing collectivity up to N=44 in Fe isotopic chain

Author

Satoru Momiyama, F. Browne, Toshiyuki Sumikama, G. Benzoni, Tadaaki Isobe, H. Baba, M.-C. Delattre, V. Modamio-Hoybjor, A. Bracco, Ryo Taniuchi, R. Daido, Jan Taprogge, D. Mengoni, Y. F. Fang, J. J. Valiente-Dobón, L. Sinclair, Tadashi Miyazaki, Shunji Nishimura, Jin Wu, Dóra Sohler, Megumi Niikura, S. Ceruti, Simon Rice, L. Coraggio, István Kuti, Zs. Vajta, Pieter Doornenbal, Giuseppe Lorusso, Hiroshi Watanabe, D. R. Napoli, Hiroyoshi Sakurai, Zhengyu Xu, R. Avigo, B. Melon, F. C. L. Crespi, A. Gargano, F. L. Bello Garrote, F. Camera, K. Matsui, N. Blasi, Rin Yokoyama, Oliver Wieland, G. de Angelis, Zena Patel, A. I. Morales, E. Sahin, Nunzio Itaco, P. A. Söderström, M. Yalcinkaya, R. Orlandi, A. Gottardo, Zsolt Dombrádi, 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), Hungarian Scientific Research Fund, Ministerio de Ciencia e Innovación (España), European Commission, and Japan Society for the Promotion of Science

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Isotope, 010308 nuclear & particles physics, Fission, Neutron emission, Nuclear Theory, Fizikai tudományok, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, lcsh:QC1-999, 3. Good health, Atomic orbital, Természettudományok, Excited state, 0103 physical sciences, Quadrupole, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment, lcsh:Physics
Abstract

6 pags.; 4 figs.; This is an open access article under the CC BY license. Funded by SCOAP, © 2015 The Authors. The β decays Mn68→Fe68, Mn69→Fe69 and Mn70→Fe70 have been measured at the RIBF facility at RIKEN using the EURICA γ spectrometer combined with an active stopper consisting of a stack of Si detectors. The nuclei were produced as fission fragments from a beam of 238U at a bombarding energy of 345 MeV/nucleon impinging on a Be target and selected using the BigRIPS separator. Half-lives and β-delayed neutron emission probabilities have been extracted for these decays, together with first experimental information on excited states populated in 69,70Fe. The data indicate a continuously increasing deformation for Fe isotopes up to A=70. This is interpreted, as for Cr isotopes, in terms of the interplay between the quadrupole correlations of the ν1d5/2 and ν0g9/2 orbitals and the monopole component of the π0f7/2-ν0f5/2 interaction., The project is co-financed by the European Union and the European Social Fund. This work was supported by NuPNET-ERANET within the NuPNET GANAS project, under grant agreement No. 202914 and from the European Union, within the 7th Framework Program FP7/2007-2013, under grant agreement No. 262010 ENSAR-INDESYS. This work was also supported by Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale (PRIN) number 2001024324_01302. We here acknowledge support from the Spanish Ministerio de Ciencia e Innovación under Contracts No. FPA2009-13377-C02 and No. FPA2011-29854-C04, the Hungarian Research Fund OTKA contract numbers K100835 and NN104543, the European Commission through the Marie Curie Actions Contract No. PIEFGA-2001-30096 and by Japanese JSPS KAKENHI Grants No. 24740188 and No. 25247045.

Published
2015

46. Isospin Mixing inZr80: From Finite to Zero Temperature

Author

S. Brambilla, S. Leoni, D. Bazzacco, P. Désesquelles, Stefano Riboldi, D. S. Judson, P. Reiter, O. Stezowski, G. Benzoni, Herbert Hess, R. Menegazzo, R. Avigo, F. C. L. Crespi, M. Ciemala, F. Camera, E. Farnea, M. Kmiecik, Andreas Görgen, G. Bocchi, J. J. Valiente-Dobón, F. Recchia, R. Nicolini, D. Montanari, P. A. Söderström, B. Birkenbach, J. Eberth, M. Zieblinski, V. Modamio, S. Myalski, Luna Pellegri, B. Million, A. Mentana, A. Jungclaus, S. Bottoni, C. A. Ur, W. Korten, D. R. Napoli, Ch. Theisen, N. Blasi, S. Ceruti, A. Bracco, A. Pullia, A. Giaz, A. Maj, A. Gottardo, O. Wieland, D. Mengoni, E. Sahin, M.D. Salsac, Begoña Quintana, D. Rosso, A. I. Morales, and C. Michelagnoli

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, Gamma ray, General Physics and Astronomy, Resonance, 7. Clean energy, 01 natural sciences, Nuclear physics, Dipole, Isospin, 0103 physical sciences, AGATA, Atomic physics, Nuclear Experiment, 010306 general physics, Mixing (physics), Excitation, Fermi Gamma-ray Space Telescope
Abstract

The isospin mixing was deduced in the compound nucleus Zr-80 at an excitation energy of E* = 54 MeV from the gamma decay of the giant dipole resonance. The reaction Ca-40 + Ca-40 at E-beam = 136 MeV was used to form the compound nucleus in the isospin I = 0 channel, while the reaction Cl-37 + Ca-44 at E-beam = 95 MeV was used as the reference reaction. The. rays were detected with the AGATA demonstrator array coupled with LaBr3:Ce detectors. The temperature dependence of the isospin mixing was obtained and the zero-temperature value deduced. The isospin-symmetry-breaking correction delta(C) used for the Fermi superallowed transitions was extracted and found to be consistent with beta-decay data.

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. Alpha–gamma discrimination by pulse shape in LaBr3:Ce and LaCl3:Ce

Author

Stefano Riboldi, Luna Pellegri, S. Brambilla, M. Sassi, F. C. L. Crespi, A. Bracco, O. Wieland, Francesco Quarati, F. Camera, B. Million, N. Blasi, R. Nicolini, and Alan Owens

Subjects
Physics, Nuclear and High Energy Physics, Pulse (signal processing), Detector, Analytical chemistry, chemistry.chemical_element, Radiation, Coincidence, Semiconductor detector, Crystal, chemistry, Lanthanum, Gamma spectroscopy, Instrumentation
Abstract

The line-shape of the signals from LaBr3:Ce and LaCl3:Ce detectors coupled to PM tubes were studied. The possibility of discriminating the type of interacting radiation was investigated making use of Pulse Shape Analysis (PSA) techniques. The study was performed measuring the self-activity present in lanthanum halide crystals in coincidence with γ-rays in a HPGe crystal. A small but significant difference between α- and γ-induced signals was directly observed for both the crystals. Using a simple PSA algorithm, it was possible to emphasize the differences in the pulse shape of γ-rays and α-particles. This resulted in a rather clear identification of these two types of radiations.

Published
2009

49. Investigation of the properties of a 1″×1″ LaBr3:Ce scintillator

Author

S. Brambilla, N. Blasi, S. Leoni, G. Benzoni, Oliver Wieland, A. Bracco, R. Bassini, C. Boiano, R. Nicolini, D. Montanari, A. Zalite, F. C. L. Crespi, F. Camera, and B. Million

Subjects
Physics, Nuclear and High Energy Physics, Detector, Resolution (electron density), Analytical chemistry, chemistry.chemical_element, Scintillator, Coincidence, Semiconductor detector, Crystal, Nuclear physics, chemistry, Lanthanum, Gamma spectroscopy, Nuclear Experiment, Instrumentation
Abstract

The properties of a cylindrical 1 00 � 1 00 LaBr3:Ce scintillator (Brillance 380) were investigated. The energy resolution at g-ray energy of 662 keV was measured to be smaller than 3% and the intrinsic time resolution was found to be E230 ps. Two different aspects were investigated. The first is the detailed study of the crystal self-activity, emitting a and b particles and g-rays, by measuring coincidences with g-rays in HPGe, BGO and BaF2 detectors. In particular, the coincidence with an HPGe detector allowed to isolate clearly the different contributions from 227 Ac (chemical homologue of lanthanum) and its daughter nuclei down to the stable 207 Pb. The second aspect is the determination of the efficiency for g-ray detection, measured at 1 MeV and simulated using GEANT4 up to 15 MeV as a function of the detector size.

Published
2007

50. Multitude of2+discrete states inSn124observed via the(O17,O′17γ)reaction: Evidence for pygmy quadrupole states

Author

N. Tsoneva, D. Mengoni, S. Ceruti, R. Avigo, J. Grebosz, D. Bazzacco, B. Birkenbach, A. Giaz, M. Kmiecik, A. Gottardo, O. Wieland, S. Bottoni, K. Mazurek, B. Siebeck, Horst Lenske, Roberto Isocrate, Luna Pellegri, N. Blasi, D. R. Napoli, A. Bracco, A. Maj, C. A. Ur, G. Benzoni, P. Bednarczyk, S. Leoni, J. J. Valiente-Dobón, Sunniva Siem, R. Nicolini, F. C. L. Crespi, A. Gadea, F. Camera, Andreas Görgen, E. Farnea, B. Million, S. Lunardi, F. Recchia, A. I. Morales, G. de Angelis, M. Krzysiek, M. Ciemala, and C. Michelagnoli

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Quadrupole, Degrees of freedom (physics and chemistry), Density functional theory, Born approximation, Atomic physics, Nuclear Experiment, Resonance (particle physics), Intensity (heat transfer), Excitation, Energy (signal processing)
Abstract

A multitude of discrete ${2}^{+}$ states in $^{124}\text{Sn}$ with energy up to 5 MeV were populated and identified with the $(^{17}\text{O}$, $^{17}\mathrm{O}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction at 340 MeV. Cross sections were compared with distorted wave Born approximation predictions and in general a good agreement was found. The measured energy and intensity distributions of the ${2}^{+}$ states are very similar to the predictions based on self-consistent density functional theory and extended QRPA approach accounting for multiphonon degrees of freedom. This provides evidence of the excitation of the pygmy quadrupole resonance in skin nuclei.

Published
2015

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