Search

Your search keyword '"J J, Valiente-Dobón"' showing total 185 results
Start Over Author "J J, Valiente-Dobón" Search Limiters Full Text
185 results on '"J J, Valiente-Dobón"'

1. Nuclear structure advancements with multi-nucleon transfer reactions

Author

R. M. Pérez-Vidal, F. Galtarossa, T. Mijatović, S. Szilner, I. Zanon, D. Brugnara, J. Pellumaj, M. Ciemala, J. J. Valiente-Dobón, L. Corradi, E. Clément, S. Leoni, B. Fornal, M. Siciliano, A. Gadea, Grand Accélérateur National d'Ions Lourds (GANIL), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Physics, multinucleon transfer reactions, gamma array
Abstract

Multi-Nucleon Transfer (MNT) reactions have been used for decades as a reaction mechanism, in order to populate excited states in nuclei far from stability and to perform nuclear structure studies. Nevertheless, the development of set-ups involving high acceptance tracking magnetic spectrometers (mainly existing in Europe), coupled with the Advanced GAmma Tracking Array (AGATA) opens new possibilities, especially if they are used in conjunction with high-intensity stable beams or ISOL RIBs. In this article, we will discuss the capabilities of such set-ups aiming at different goals, including complete information in high-resolution spectroscopy as well as lifetime measurements.

Published
2023

2. Decay spectroscopy of Os171,172 and Ir171,172,174

Author

W. Zhang, B. Cederwall, M. Doncel, Ö. Aktas, A. Ertoprak, C. Qi, T. Grahn, B. S. Nara Singh, D. M. Cullen, D. Hodge, M. Giles, S. Stolze, K. Auranen, H. Badran, T. Braunroth, T. Calverley, D. M. Cox, Y. D. Fang, P. T. Greenlees, J. Hilton, E. Ideguchi, R. Julin, S. Juutinen, M. Kumar Raju, M. Leino, H. Li, H. Liu, S. Matta, P. Subramaniam, V. Modamio, J. Pakarinen, P. Papadakis, J. Partanen, C. M. Petrache, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, M. J. Taylor, J. Uusitalo, and J. J. Valiente-Dobón

Published
2023

3. Evidence of Partial Seniority Conservation in the πg9/2 Shell for the N=50 Isotones

Author

R. M. Pérez-Vidal, A. Gadea, C. Domingo-Pardo, A. Gargano, J. J. Valiente-Dobón, E. Clément, A. Lemasson, L. Coraggio, M. Siciliano, S. Szilner, M. Bast, T. Braunroth, J. Collado, A. Corina, A. Dewald, M. Doncel, J. Dudouet, G. de France, C. Fransen, V. González, T. Hüyük, B. Jacquot, P. R. John, A. Jungclaus, Y. H. Kim, A. Korichi, M. Labiche, S. Lenzi, H. Li, J. Ljungvall, A. López-Martens, D. Mengoni, C. Michelagnoli, C. Müller-Gatermann, D. R. Napoli, A. Navin, B. Quintana, D. Ramos, M. Rejmund, E. Sanchis, J. Simpson, O. Stezowski, D. Wilmsen, M. Zielińska, A. J. Boston, D. Barrientos, P. Bednarczyk, G. Benzoni, B. Birkenbach, H. C. Boston, A. Bracco, B. Cederwall, D. M. Cullen, F. Didierjean, J. Eberth, A. Gottardo, J. Goupil, L. J. Harkness-Brennan, H. Hess, D. S. Judson, A. Kaşkaş, W. Korten, S. Leoni, R. Menegazzo, B. Million, J. Nyberg, Zs. Podolyak, A. Pullia, D. Ralet, F. Recchia, P. Reiter, K. Rezynkina, M. D. Salsac, M. Şenyiğit, D. Sohler, Ch. Theisen, and D. Verney

Subjects
General Physics and Astronomy
Published
2022

4. Evidence for spherical-oblate shape coexistence in Tc-87

Author

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

Subjects
Subatomär fysik, Atom and Molecular Physics and Optics, Subatomic Physics, Atom- och molekylfysik och optik
Abstract

6 pags., 8 figs., 1 tab., Excited states in the neutron-deficient nucleus Tc87 have been studied via the fusion-evaporation reaction Fe54(Ar36,2n1p)Tc87 at 115 MeV beam energy. The AGATA γ-ray spectrometer coupled to the DIAMANT, NEDA, and Neutron Wall detector arrays for light-particle detection was used to measure the prompt coincidence of γ rays and light particles. Six transitions from the deexcitation of excited states belonging to a new band in Tc87 were identified by comparing γ-ray intensities in the spectra gated under different reaction channel selection conditions. The constructed level structure was compared with the shell model and total Routhian surface calculations. The results indicate that the new band structure in Tc87 is built on a spherical configuration, which is different from that assigned to the previously identified oblate yrast rotational band., This work was supported by the Swedish Research Council under Grants No. 621-2014-5558 and No. 2019-04880; the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 ENSAR; the UK STFC under Grants No. ST/L005727/1 and No. ST/P003885/1; the Polish National Science Centre, Grants No. 2016/22/M/ST2/00269 and No. 2017/25/B/ST2/01569; COPIN-INFN, COPIN-IN2P3, and COPIGAL projects; the National Research, Development and Innovation Fund of Hungary (Project No. K128947); the European Regional Development Fund (Contract No. GINOP-2.3.3-15-2016-00034); the Hungarian National Research, Development and Innovation Office, NKFIH, Contract No. PD124717; the Ministerio de Ciencia e Innovación and Generalitat Valenciana, Spain, under the Grants No. SEV-2014-0398 and No. FPA2017-84756-C4; PROMETEO/2019/005; and by the EU FEDER funds. X.L. gratefully acknowledges support from the China Scholarship Council, Grant No. 201700260183, for his stay in Sweden. We acknowledge the support from the AGATA Collaboration and thank the GANIL staff for excellent technical support and operation

Published
2022

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

Author

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

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

6. Lifetime measurements in the even-even Cd102–108 isotopes

Author

M. Siciliano, J. J. Valiente-Dobón, A. Goasduff, T. R. Rodríguez, D. Bazzacco, G. Benzoni, T. Braunroth, N. Cieplicka-Oryńczak, E. Clément, F. C. L. Crespi, G. de France, M. Doncel, S. Ertürk, C. Fransen, A. Gadea, G. Georgiev, A. Goldkuhle, U. Jakobsson, G. Jaworski, P. R. John, I. Kuti, A. Lemasson, H. Li, A. Lopez-Martens, T. Marchi, D. Mengoni, C. Michelagnoli, T. Mijatović, C. Müller-Gatermann, D. R. Napoli, J. Nyberg, M. Palacz, R. M. Pérez-Vidal, B. Sayği, D. Sohler, S. Szilner, and D. Testov

Subjects
Physics, Nuclear physics, Nuclear interaction, medicine.anatomical_structure, Isotope, 010308 nuclear & particles physics, Nuclear Theory, 0103 physical sciences, medicine, Nuclear Experiment, 010306 general physics, 01 natural sciences, Nucleus
Abstract

Background: The heaviest T-z = 0 doubly-magic nucleus, Sn-100, and the neighboring nuclei offer unique opportunities to investigate the properties of nuclear interaction. For instance, the structur ...

Published
2021

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

Author

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

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

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

Published
2021

8. A powerful combination measurement for exploring the fusion reaction mechanisms induced by weakly bound nuclei

Author

Y. J. Yao, A. Boso, S. M. Lenzi, D. Mengoni, E. T. Li, G. L. Zhang, F. Recchia, F. Galtarossa, D. R. Napoli, G. X. Zhang, D. Bazzacco, D. A. Testov, Shi-Peng Hu, P. R. John, J. J. Valiente-Dobón, Alain Goasduff, X. Hao, R. Menegazzo, M. Siciliano, H. B. Sun, Huan-Qiao Zhang, and D. De Angelis

Subjects
Physics, Nuclear and High Energy Physics, Reaction mechanism, Fusion, Coincidence measurement, Spectrometer, 010308 nuclear & particles physics, Projectile, Charged-particle detector, Breakup, 01 natural sciences, Molecular physics, Coincidence, Charged particle, γ-ray detector, Fusion mechanisms, Instrumentation, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics
Abstract

The GALILEO array is a high-efficiency γ -ray spectrometer, resident at the Legnaro National Laboratory (LNL)in Italy, and it is currently used in combination with the Si-ball EUCLIDES for the detection of charged-particles. The combined setup was used in the 6 Li+89Y experiment with incident energies of 22 MeV and 34 MeV to investigate the influence of breakup and transfer of weakly bound projectile on the fusion process. Using the coincidence by the charged particles and γ -rays, the different reaction channels can be clearly identified and the different reaction mechanisms can be clearly studied. It is shown that this facility can be used well to explore the fusion reaction mechanisms induced by weakly bound nuclei.

Published
2019

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. Onset of triaxial deformation in Zn66 and properties of its first excited 0+ state studied by means of Coulomb excitation

Author

M. Matejska-Minda, M. Siciliano, M. Zielińska, L. Ramina, D. A. Testov, P. Sona, D. T. Doherty, K. Hadyńska-Klȩk, F. Nowacki, A. Boso, F. Recchia, G. De Gregorio, F. Galtarossa, P. Cocconi, M. Rampazzo, P. R. John, J. J. Valiente-Dobón, M. Komorowska, P. J. Napiorkowski, M. Rocchini, D. Rosso, Massimo Chiari, Tomás R. Rodríguez, N. Marchini, R. Menegazzo, M. Ottanelli, A. Gargano, A. Goasduff, A. Nannini, D. R. Napoli, B. Melon, D. Bazzacco, A. Perego, D. Mengoni, S. Riccetto, G. Jaworski, G. Benzoni, and H. Naïdja

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Nuclear structure, Magnetic monopole, Coulomb excitation, 01 natural sciences, Matrix (mathematics), Excited state, 0103 physical sciences, Quadrupole, Atomic physics, 010306 general physics, Excitation
Abstract

The electromagnetic structure of Zn66 at low excitation energy was investigated via low-energy Coulomb excitation at INFN Legnaro National Laboratories, using the Gamma Array of Legnaro Infn Laboratories for nuclEar spectrOscopy (GALILEO) γ-ray spectrometer coupled to the SPIDER (Silicon PIe DEtectoR). A set of reduced E2, E3, and M1 matrix elements was extracted from the collected data using the gosia code, yielding 12 reduced transition probabilities between the low-spin states and the spectroscopic quadrupole moment of the 21+ state. The B(E2) values for transitions depopulating the 02+ state have been determined for the first time, allowing for the lifetime of this state to be deduced and, consequently, the ρ2(E0;02+→01+) monopole transition strength to be extracted. In addition, the B(E3;31−→01+) value has been determined for the first time in a Coulomb excitation experiment. The obtained results resolve the existing discrepancies between literature lifetimes and demonstrate that Zn66 cannot be described by using simple collective models. Therefore, new state-of-the-art beyond-mean-field and large-scale shell-model calculations were performed in order to interpret the structure of this nucleus. Both the experimental and theoretical results suggest that the triaxial degree of freedom has an important impact on electromagnetic properties of Zn66, while the unique features of the 02+ state indicate its distinct and rather isolated structure.

Published
2021

11. 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

12. Angular distribution of $\gamma $ rays emitted by oriented nuclei: the case of $^{92}$Mo formed in the reaction $^6$Li+$^{89}$Y

Author

G. L. Zhang, M. J. Ermamatov, D. Testov, Shi-Peng Hu, A. Goasduff, F. Galtarossa, D. Bazzacco, F. Recchia, J. L. Ferreira, P. R. John, Y. F. Lv, B. Paes, G. X. Zhang, Huan-Qiao Zhang, M. Siciliano, M. Mazzocco, X. B. Qin, Jingcai Lu, E. N. Cardozo, Z. Huang, H. B. Sun, D. Mengoni, J. J. Valiente-Dobón, J. Lubian, H. M. Zhao, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, SHELL model, Hadron, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Angular distribution, Excited state, 0103 physical sciences, Nuclear fusion, Atomic physics, 010306 general physics, Spin (physics), Hpge detector
Abstract

Gamma-ray angular distributions in oriented $$^{92}$$ Mo produced via the $$^{6}$$ Li+ $$^{89}$$ Y reaction were studied in this work. The characteristic $$\gamma $$ rays in $$^{92}$$ Mo were measured by means of the GALILEO array, which is composed of 25 Compton-suppressed HPGe detectors arranged in a nearly 2 $$\pi $$ geometry. A detailed analysis of the spin-alignment attenuation factors ( $$\alpha _2$$ ) for different excited states in $$^{92}$$ Mo was performed, by analyzing the measured angular distribution coefficients of several pure-E2 transitions. The relationship between $$\alpha _2$$ and the spin was established in $$^{92}$$ Mo and the 244-keV transition between the 5 $$^-_1$$ and 4 $$^+_1$$ states resulted to have a E1 + M2 character with a mixing ratio ( $$\delta $$ ) of $$-0.05^{+0.05}_{-0.06}$$ , consistent with shell model calculations.

Published
2021

13. Octupole correlations near Te 110

Author

Maria Doncel, D. Bazzacco, A. Goasduff, S. M. Lenzi, G. Jaworski, G. de Angelis, F. Didierjean, L. M. Robledo, Huan Liu, R. Menegazzo, M. Siciliano, F. Nowacki, D. Mengoni, D. A. Testov, S. Lunardi, Tomás R. Rodríguez, B. Saygi, Bo Cederwall, Yu. Sobolev, F. Recchia, S. Bakes, G. Colucci, M. Rocchini, P. Čolović, J. A. Dueñas, C. Boiano, G. Pasqualato, Suzana Szilner, A. Mentana, Magda Cicerchia, A. Gozzelino, K. Hadynska-Klek, A. Boso, F. Galtarossa, P. R. John, J. J. Valiente-Dobón, D. R. Napoli, S. Frauendorf, S. Riccetto, and UAM. Departamento de Física Teórica

Subjects
Physics, Engineering management, Spin, Work (electrical), 010308 nuclear & particles physics, Chiral, 0103 physical sciences, Física, 010306 general physics, 01 natural sciences, Shell Model, Nucleus, Band
Abstract

The lifetime of the 2(+) and 9(-), 11(-), 13(-), 15(-) states in the neutron-deficient Te-110 was measured for the first time using the recoil distance Doppler shift technique. The reported value of the reduced transition probability B(E2; 0(g.s)(+) -> 2(+)) = 4.3(8) x 10(3) e(2) f m(4) supports the systematic for even-mass Te isotopes and was interpreted g.s in the framework of the large-scale shell model and cranked shell model calculations. The measured reduced transition probabilities in the negative-parity yrast band revealed the upward trend towards the high spins. The enhanced collectivity is discussed in terms of the tilted axis cranking approach and the symmetry configuration mixing method with the Gogny D1S interaction., DoE [DE-FG02-95ER4093]; Spanish MICINN [PGC2018-094583-B-I00], The authors would like to thank the technical staff of the LNL Legnaro facility for their assistance in providing excellent operation of the XTU-tandem accelerator. The authors wish to acknowledge the support of local engineers P. Cocconi and R. Isocrate. The work was partially supported by the DoE Grant No. DE-FG02-95ER4093 and Spanish MICINN Grant No. PGC2018-094583-B-I00.

Published
2021

14. Manifestation of the Berry phase in the atomic nucleus 213Pb

Author

S. Klupp, A. Algora, Roberto Menegazzo, D. Mengoni, F. Naqvi, J. J. Valiente-Dobón, S. Pietri, T. Habermann, J. Benlliure, Branislav Sitar, Alison Bruce, A. Bracco, P. Van Isacker, N. Kurz, Andrea Corsi, E. Sahin, Dirk Rudolph, Imrich Szarka, Helmut Weick, Zs. Podolyák, J. Gerl, J. Grebosz, Davinder Siwal, S. K. Mandal, S. Leoni, T. Engert, D. Bazzacco, A. Prochazka, M. Górska, F. Recchia, S. Lunardi, D. R. Napoli, Hans Geissel, P. Boutachkov, A. Gottardo, F. Camera, Enrique Casarejos, I. Kojouharov, P. H. Regan, E. Gregor, Oliver Wieland, H. J. Wollersheim, A. Sharma, G. de Angelis, C. Nociforo, F. C. L. Crespi, A. Goasduff, C. Domingo-Pardo, A. I. Morales, M. Pfützner, B. Million, G. Benzoni, M. L. Cortés, Philip M Walker, C. A. Ur, Peter Strmen, H. Schaffner, A. Gadea, Maria Doncel, N. Goel, S. M. Lenzi, 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, Angular momentum, nucl-th, Nuclear Theory, isomeric decays, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Nuclear Theory (nucl-th), 0103 physical sciences, Subatomic Physics, Nuclear Physics - Experiment, ddc:530, 22 Física, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Physics, Isotope, 010308 nuclear & particles physics, 2207 Física Atómica y Nuclear, Quantum number, lcsh:QC1-999, relativistic projectile fragmentation, ddc, Geometric phase, gamma-ray spectroscopy, Nuclear Physics - Theory, Atomic nucleus, Atomic number, Atomic physics, Nucleon, lcsh:Physics
Abstract

Physics letters / B 816, 136183 (2021). doi:10.1016/j.physletb.2021.136183, Published by North-Holland Publ., Amsterdam

Published
2021

15. Lifetimes of core-excited states in semi-magic $$^{95}\mathrm {Rh}$$

Author

G. de Angelis, Eric Clément, Bo Cederwall, H. Al Azri, Mikael Sandzelius, Ulrika Jakobsson, C. M. Petrache, Chong Qi, S. S. Ghugre, V. Modamio, Zhigang Xiao, F. Ghazi Moradi, S. Erturk, G. Jaworski, Baki Akkuş, A. Algora, A. Ertoprak, M. Palacz, M. Doncel, C. Michelagnoli, Torbjörn Bäck, Eiji Ideguchi, A. Boso, H. W. Li, J. J. Valiente-Dobón, M. Siciliano, Zs. Dombradi, A. Gadea, T. Hüyük, Johan Nyberg, F. Recchia, R. Wadsworth, B. M. Nyakó, P. J. Davies, István Kuti, D. M. Debenham, D. R. Napoli, D. Sohler, A. Gottardo, János Timár, R. Raut, A. Atac, Department of Physics [Stockholm], Royal Institute of Technology [Stockholm] (KTH ), 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Department of Physics, Royal Institute of Technology (KTH), 10691 Stockholm, Sweden

Subjects
[PHYS]Physics [physics], Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, 01 natural sciences, Core (optical fiber), symbols.namesake, Excited state, 0103 physical sciences, symbols, Nuclear fusion, Neutron, MAGIC (telescope), Atomic physics, 010306 general physics, Doppler effect, Line (formation)
Abstract

Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus $$^{95}\mathrm {Rh}$$ 95 Rh . The fusion-evaporation reaction $$^{58}Ni(^{40}Ca, 3p)$$ 58 N i ( 40 C a , 3 p ) was used to populate high-spin states in $$^{95}\mathrm {Rh}$$ 95 Rh at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick $$6\;\mathrm {mg/cm}^2$$ 6 mg / cm 2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations.

Published
2020

16. Isomeric and β -decay spectroscopy of Ho173,174

Author

P. Lee, Zs. Dombrádi, I. Nishizuka, P. M. Walker, C. M. Shand, Naohito Inabe, F. G. Kondev, Jinguang Wu, Zs. Vajta, Eiji Ideguchi, Jenny Lee, Shigeru Kubono, C. S. Lee, S. Kanaya, N. Kurz, Oliver J. Roberts, Ayumi Yagi, C. R. Nita, Atsuko Odahara, Zhengyu Xu, C. J. Griffin, Y. Shimizu, Z. Patel, G. X. Zhang, D. S. Ahn, H. Baba, V. H. Phong, Naoki Fukuda, Raymond J. Carroll, Hiroyoshi Sakurai, Gavin Lotay, S. Lalkovski, Zs. Podolyák, Toshiyuki Kubo, Shunji Nishimura, F. Browne, Eunji Lee, T. Isobe, A. Estrade, István Kuti, Satoru Terashima, G. J. Lane, Giuseppe Lorusso, Z. Korkulu, A. C. Dai, P. Doornenbal, P. H. Regan, Hiroshi Watanabe, H. Kanaoka, Furong Xu, Thamer Alharbi, H. Schaffner, K. Y. Chae, P. A. Söderström, Toshiyuki Sumikama, Hiroyuki Takeda, Alison Bruce, J. J. Valiente-Dobón, J. Liu, Chang-Bum Moon, Hiroshi Suzuki, and I. Kojouharov

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Physical chemistry, 010306 general physics, Spectroscopy, 01 natural sciences, Beta decay
Published
2020

17. Evidence for pseudospin-chiral quartet bands in the presence of octupole correlations

Author

A. Ataç-Nyberg, M. Siciliano, K. Ortner, Bo Cederwall, E. A. Lawrie, Corina Andreoiu, Torbjörn Bäck, A. Goasduff, Miao Liu, E. Dupont, Y. H. Zhang, A. Tucholski, C. M. Petrache, Shishu Zhang, J. J. Valiente-Dobón, Y.Y. Wang, István Kuti, F. Recchia, Jie Meng, Y.P. Wang, Y. H. Qiang, D. Bazzacco, D. Mengoni, Song Guo, D. R. Napoli, Dóra Sohler, A. Astier, H.L. Fan, Jie Wang, T. Marchlewski, Xiaojuan Zhou, Pengwei Zhao, A. Boso, Guangsheng Li, F. H. Garcia, S. Riccetto, Y.K. Wang, B. F. Lv, F. Galtarossa, J. Srebrny, D. Testov, G. Jaworski, K. Whitmore, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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
Physics, Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Degenerate energy levels, High Energy Physics::Phenomenology, Nuclear structure, Parity (physics), Tilted axis cranking covariant density functional theory, 01 natural sciences, Molecular physics, lcsh:QC1-999, 0103 physical sciences, Octupole correlation, Pseudospin, Chirality, 010306 general physics, Chirality (chemistry), Reflection-asymmetric particle rotor model, lcsh:Physics
Abstract

Three nearly degenerate pairs of doublet bands are identified in $^{131}$Ba. Two of them, with positive-parity, are interpreted as pseudospin-chiral quartet bands. This is the first time that a complete set of chiral doublet bands built on the pseudospin partners π(d5/2,g7/2) is observed. The chiral bands with opposite parity built on 3-quasiparticle configurations are directly connected by many E1 transitions, without involving an intermediary non-chiral configuration. The observed band structures in $^{131}$Ba have been investigated by using the reflection-asymmetric particle rotor model. The energies and the electromagnetic transition ratios of the three pairs of doublet bands observed in $^{131}$Ba are reproduced and they are interpreted as chiral doublet bands with three-quasiparticle configurations. It is the first time that multiple chiral bands are observed in the presence of enhanced octupole correlations and pseudospin symmetry.

Published
2020

18. 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

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

Author

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

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

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

Published
2020

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

Author

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

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

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

Published
2020

21. Shape coexistence in neutron-deficient Hg188 investigated via lifetime measurements

Author

P. R. John, J. J. Valiente-Dobón, M. Zielińska, J. Pakarinen, I. Deloncle, A. Boso, B. Melon, D. Mengoni, D. A. Testov, B. de Canditiis, R. Menegazzo, Thomas Braunroth, A. Goasduff, S. M. Lenzi, Sophie Péru, A. Nannini, I. Zanon, G. Jaworski, G. de Angelis, A. Gadea, D. R. Napoli, F. Galtarossa, N. Cieplicka-Oryńczak, A. Vogt, B. Birkenbach, D. Ashad, F. Recchia, Liam Gaffney, G. Benzoni, W. Witt, D. Quero, D. Bazzacco, A. Gozzelino, P. Koseoglou, K. Hadyńska-Klȩk, F. Davide, M. Siciliano, P. K. Rath, J. Wiederhold, J. Libert, Magda Cicerchia, G. Colucci, Tomás R. Rodríguez, and M. Rocchini

Subjects
Physics, Spectrometer, Isotope, 010308 nuclear & particles physics, Nuclear structure, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Molecular physics, symbols.namesake, medicine.anatomical_structure, chemistry, Excited state, 0103 physical sciences, medicine, symbols, Neutron, 010306 general physics, Hamiltonian (quantum mechanics), Nucleus, Polonium
Abstract

Background: Shape coexistence in the Z≈82 region has been established in mercury, lead, and polonium isotopes. For even-even mercury isotopes with 100≤N≤106 multiple fingerprints of this phenomenon are observed, which seems to be no longer present for N≥110. According to a number of theoretical calculations, shape coexistence is predicted in the Hg188 isotope. Purpose: The aim of this work was to measure lifetimes of excited states in Hg188 to infer their collective properties, such as the deformation. Extending the investigation to higher-spin states, which are expected to be less affected by band-mixing effects, can provide additional information on the coexisting structures. Methods: The Hg188 nucleus was populated using two different fusion-evaporation reactions with two targets, Gd158 and Gd160, and a beam of S34 provided by the Tandem-ALPI accelerator complex at the Laboratori Nazionali di Legnaro. The channels of interest were selected using the information from the Neutron Wall array, while the γ rays were detected using the GALILEO γ-ray spectrometer. Lifetimes of excited states were determined using the recoil-distance Doppler-shift method, employing the dedicated GALILEO plunger device. Results: Lifetimes of the states up to spin 16ℏ were measured and the corresponding reduced transition probabilities were calculated. Assuming two-band mixing and adopting, as done commonly, the rotational model, the mixing strengths and the deformation parameters of the unperturbed structures were obtained from the experimental results. In order to shed light on the nature of the observed configurations in the Hg188 nucleus, the extracted transition strengths were compared with those resulting from state-of-the-art beyond-mean-field calculations using the symmetry-conserving configuration-mixing approach, limited to axial shapes, and the five-dimensional collective Hamiltonian, including the triaxial degree of freedom. Conclusions: The first lifetime measurement for states with spin ≥6 suggested the presence of an almost spherical structure above the 121+ isomer and allowed elucidating the structure of the intruder band. The comparison of the extracted B(E2) strengths with the two-band mixing model allowed the determination of the ground-state band deformation. Both beyond-mean-field calculations predict coexistence of a weakly deformed band with a strongly prolate-deformed one, characterized by elongation parameters similar to those obtained experimentally, but the calculated relative position of the bands and their mixing strongly differ.

Published
2020

22. Physics opportunities with the Advanced Gamma Tracking Array: AGATA

Author

W. Korten, A. Bracco, A. Atac, G. Benzoni, S. Leoni, P. Reiter, A. Goasduff, Eric Clément, K. A. Gladnishki, F. Recchia, A. Jungclaus, Bo Cederwall, G. Duchêne, D. G. Jenkins, A. Nannini, P. Bednarczyk, M. Zielińska, Dirk Rudolph, Riccardo Raabe, B. Million, A. Tumino, P. J. Nolan, D. R. Napoli, B. Fernández-Domínguez, F. Didierjean, Johan Nyberg, Herbert Hess, A. Gadea, D. Tonev, M. Ciemala, G. Rainovski, D. T. Doherty, Joakim Cederkäll, A. Obertelli, J. Gerl, J. J. Valiente-Dobón, B. Fornal, Begoña Quintana, J. Ljungvall, Ch. Theisen, Janne Pakarinen, G. de Angelis, P. R. John, M. Kmiecik, O. Wieland, Zs. Dombrádi, J. Simpson, A. J. Boston, M. Górska, Zs. Podolyák, D. Curien, J. Dudek, Norbert Pietralla, F. C. L. Crespi, A. Maj, K. Wimmer, Paul Greenlees, D. Beaumel, M. Labiche, A. Lopez-Martens, A. Korichi, M. A. Bentley, D. Mengoni, Liam Gaffney, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire 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 Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), AGATA, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ministerio de Ciencia, Innovación y Universidades (España), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Radioactive ion beams, Nuclear and High Energy Physics, NEUTRON-RICH, Position resolution, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Accelerator Physics and Instrumentation, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Physics, Particles & Fields, Subatomär fysik, Optics, Subatomic Physics, 0103 physical sciences, Gamma spectroscopy, SPECTROMETER, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], SUPERHEAVY ELEMENTS, 010306 general physics, ROTATIONAL BAND, DETECTOR, Physics, Science & Technology, Spectrometer, 010308 nuclear & particles physics, business.industry, European research, Detector, Acceleratorfysik och instrumentering, FISSION-BARRIERS, PERFORMANCE, Physics, Nuclear, SPIN, Physical Sciences, SHELL-MODEL, AGATA, business, DECAY
Abstract

AGATA Collaboration, New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4π instrument. AGATA is a high-resolution γ-ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring γ rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual γ-ray interactions, and very high count-rate capability. As a travelling detector AGATA will be employed at all major current and near-future European research facilities delivering stable and radioactive ion beams., The AGATA project has been supported by the European Structural Funds FSE FEDER, the Academy of Finland FIRI program, Finland, the Direction de Recherches Fondamentales of CEA, France, the Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) of CNRS, France, the Bundesministerium für Bildung und Forschung (BMBF), Germany, the Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Hungary, the IstitutoNazionale di Fisica Nucleare (INFN), Italy, theNational Science Center (NCN), Poland, the Knut and AliceWallenberg foundation (Sweden), the Swedish Research Council, the Conselleria d’Educació, Investigació, Cultura i Esport, Generalitat Valenciana and Ministerio de Ciencia, Innovación y Universidades, Spain, the Türkiye Bilimsel ve Teknolojik Ara¸stirma Kurumu (TÜBITAK), Turkey, and the United Kingdom Research and Innovation – Science and Technology Facilities Council (UKRI-STFC).

Published
2020

23. 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

24. 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

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

Author

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

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

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

Published
2020

26. Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the $\pi (p_{3/2})\rightarrow \pi (p_{1/2})$ spin-flip transition in $^{85}$Br

Author

Diego Barrientos, M. Labiche, L. Grassi, J. Eberth, Claes Fahlander, V. Modamio, I. Kojouharov, B. Birkenbach, O. Möller, H. Egger, F. C. L. Crespi, P. Désesquelles, C. Domingo-Pardo, S. Afara, W. Korten, A. Bracco, B. S. Nara Singh, D. M. Cullen, Enrique Sanchis, M. Lettmann, Pavel Golubev, Oliver Wieland, J. Gerl, B. Bruyneel, G. Rainovski, Dirk Rudolph, A. Maj, Norbert Pietralla, A. Blazhev, P. R. John, A. Gottardo, D. Curien, P. Bednarczyk, B. Million, Luis Sarmiento, T. Arici, Pushpendra Singh, S. Aydin, E. Merchan, P. Reiter, F. Ameil, S. Pietri, J. Simpson, Eric Clément, J. Jolie, C. Stahl, K. A. Gladnishki, K. Moschner, Herbert Hess, A. J. Boston, D. Ralet, M. L. Cortés, N. Lalović, C. Louchart-Henning, M. A. Bentley, D. S. Judson, H. Schaffner, J. J. Valiente-Dobón, P. Boutachkov, Roberto Menegazzo, D. Mengoni, M. Reese, V. Werner, G. Duchêne, L. J. Harkness-Brennan, G. Benzoni, D. R. Napoli, Vicente González, F. Didierjean, Zs. Podolyák, T. Möller, C. Lizarazo, P. Napiralla, M. Górska, T. Habermann, D. G. Jenkins, 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), 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), 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
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Transition strength, 0103 physical sciences, Nuclear fusion, AGATA, Spin-flip, 010306 general physics, Beam (structure)
Abstract

International audience; A first performance test of the Coulomb excitation multipolarimetry (Coulex-multipolarimetry) method is presented. It is based on a $^{85}\hbox {Br}\,\pi p_{3/2}\rightarrow \pi p_{1/2}$ spin-flip experiment performed as part of the PreSPEC-AGATA campaign at the GSI Helmholtzzentrum für Schwerionenforschung (GSI). Via determination of background levels around the expected $^{85}\hbox {Br}$ excitations as well as measured $^{197}\hbox {Au}$ excitations, an upper limit for the M1 transition strength of the $1/2_1^-\rightarrow 3/2_\text {g.s.}^-$ transition in $^{85}\hbox {Br}$ and a lower beam time limit for upcoming experimental campaigns utilizing Coulex-multipolarimetry have been inferred. The impact of the use of AGATA in its anticipated $1\pi $ configuration on these estimates is deduced via Geant4 simulations.

Published
2020

27. Pseudospin partner bands in Ba 130

Author

C. M. Petrache, D. Mengoni, Song Guo, Q. B. Chen, István Kuti, Corina Andreoiu, B. Ding, S. Riccetto, Jianlu Wang, D. Bazzacco, F. H. Garcia, Y. X. Liu, E. A. Lawrie, A. Tucholski, A. Goasduff, D. R. Napoli, T. Marchlewski, E. Dupont, K. K. Zheng, G. Jaworski, M. L. Liu, D. Sohler, J. J. Valiente-Dobón, Y. H. Qiang, K. Whitmore, F. Galtarossa, Bo Cederwall, X. H. Zhou, B. F. Lv, M. Siciliano, J. Srebrny, A. Astier, K. Ortner, A. Boso, Y. D. Fang, D. A. Testov, and F. Recchia

Subjects
Physics, Condensed matter physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2020

28. Lifetime measurements using a plunger device and the EUCLIDES Si array at the GALILEO $\gamma$-ray spectrometer

Author

S. Bakes, S. M. Lenzi, P. R. John, Yu. G. Sobolev, Suzana Szilner, G. Pasqualato, J. J. Valiente-Dobón, A. Gozzelino, F. Galtarossa, H. Liu, D. Testov, C. Müller-Gatermann, M. Rocchini, J. Bradbury, F. Recchia, G. Jaworski, K. Hadyńska-Klȩk, D. R. Napoli, M. Doncel, S. Riccetto, B. Saygi, A. Mentana, J. A. Dueñas, A. Goasduff, G. de Angelis, D. Bazzacco, A. Boso, F. Didierjean, P. Čolović, Bo Cederwall, R. Menegazzo, S. Lunardi, M. Siciliano, C. Boiano, Magda Cicerchia, D. Mengoni, G. Colucci, 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), and Ege Üniversitesi

Subjects
Nuclear and High Energy Physics, Lifetime measurements, 01 natural sciences, 7. Clean energy, Nuclear physics, symbols.namesake, Recoil, 0103 physical sciences, 010306 general physics, Instrumentation, Physics, [PHYS]Physics [physics], gamma-ray spectroscopy gamma-ray spectrometer, Range (particle radiation), Plunger, Spectrometer, 010308 nuclear & particles physics, γ-ray spectroscopy γ-ray spectrometer, Detector, Si-array, ?-ray spectroscopy ?-ray spectrometer, Picosecond, Excited state, symbols, Galileo (vibration training), Doppler effect
Abstract

The GALILEO ?-ray spectrometer, installed at the Laboratori Nazionali di Legnaro (LNL), benefits from intense stable beams provided by the Tandem-ALPI-PIAVE accelerator complex and from radioactive beams to be delivered in the near future by the SPES facility. The spectrometer is complemented with a variety of ancillary devices to allow for nuclear structure and reaction studies. The 4? Si-ball array EUCLIDES coupled to the GALILEO ?-ray spectrometer represents one of the commonly used setup for experiments aiming at spectroscopic studies. High-efficiency detection of light-charged particles in a fusion–evaporation reaction guarantees good discrimination of different reaction channels and provides essential information for the kinematic reconstruction. In this paper we discuss a configuration of the EUCLIDES array developed for the lifetime measurements of nuclear excited states populated in a fusion–evaporation reaction. In such a configuration a part of the EUCLIDES detectors is disassembled allowing for the installation of a plunger device in the reaction chamber. The reduced configuration of EUCLIDES provides high detection efficiency necessary for reliable light charged-particle discrimination. We report on the commissioning experiment focused on the 58Ni(58Ni,3p)113I reaction. The lifetimes of 11/2? and 15/2? states were measured by applying the Recoil Distance Doppler Shift method to be equal to 206(20) ps and 7.9(12) ps correspondingly and were in good agreement with the values cited in the literature. Thus, the combination of the GALILEO and EUCLIDES arrays, and the plunger device has resulted in a powerful experimental setup to determine lifetimes of excited states in neutron-deficient nuclei in the picosecond range. © 2020 Elsevier B.V., Fondazione Cassa di Risparmio di Padova e Rovigo Narodowe Centrum Nauki, NCN: 2017/25/B/ST2/01569 Narodowym Centrum Nauki, NCN, The authors would like to thank the technical staff of the LNL-INFN facility for their assistance in providing excellent operation of the XTU-Tandem accelerator. The authors wish to acknowledge the support of local engineers P. Cocconi and R. Isocrate. The work of G. Jaworski was supported by the National Science Centre, Poland (NCN) (grant no. 2017/25/B/ST2/01569 ). A. Goasduff acknowledges the support of the CARIPARO foundation under the Starting Grant 2017 .

Published
2020

29. Evidence for octupole collectivity in $^{172}{\mathrm {Pt}}$

Author

E. Ganioglu, Rauno Julin, I. Özgür, R. D. Page, Eiji Ideguchi, O. Aktas, Sanna Stolze, E. S. Paul, J. Hilton, Torbjörn Bäck, H. W. Li, J. J. Valiente-Dobón, S. Matta, Mikael Sandzelius, Steffen Ketelhut, B. S. Nara Singh, Panu Rahkila, Tuomas Grahn, U. Jakobsson, Panu Ruotsalainen, C. M. Petrache, Megumi Niikura, D. M. Cullen, Jari Partanen, K. Andgren, Janne Pakarinen, Bo Cederwall, A. Ertoprak, B. Hadinia, D. Hodge, M. Kumar Raju, T. Calverley, Juha Sorri, Juha Uusitalo, V. Modamio, H. Badran, Paul Greenlees, Chong Qi, M. Nyman, Pauli Peura, Daniel Cox, A. Johnson, Jan Sarén, Y. D. Fang, Peter M. Jones, Michael Taylor, Matti Leino, Ramon Wyss, Thomas Braunroth, Catherine Scholey, H. Liu, Sakari Juutinen, Roberto Liotta, M. B. Gomez Hornillos, M. Doncel, M. M. Giles, P. Subramaniam, Philippos Papadakis, Anton Khaplanov, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Nuclear fusion, 010306 general physics, Nucleus, Excitation
Abstract

Excited states in the extremely neutron-deficient nucleus $$^{172}{\mathrm {Pt}}$$172Pt were populated via $$^{96}\mathrm {Ru}(^{78}\mathrm {Kr},2p)$$96Ru(78Kr,2p) and $$^{92}\mathrm {Mo}(^{83}\mathrm {Kr},3n)$$92Mo(83Kr,3n) reactions. The level scheme has been extended up to an excitation energy of $$\approx 5~\hbox {MeV}$$≈5MeV and tentative spin-parity assignments up to $$I^\pi = 18^+$$Iπ=18+. Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negative-parity band. The lowest member of this negative-parity structure was firmly assigned spin-parity $$3^-$$3-. In addition, we observed an E3 transition from this $$3^-$$3- state to the ground state, providing direct evidence for octupole collectivity in $$^{172}{\mathrm {Pt}}$$172Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the $$3^-$$3- state as a collective octupole-vibrational state.

Published
2020

30. Population of lead isotopes in binary reactions using a Rb 94 radioactive beam

Author

Janne Pakarinen, G. de Angelis, P. Reiter, H. De Witte, Roberto Menegazzo, D. Mengoni, T. Marchi, P. Spagnoletti, P. Čolović, Zs. Podolyák, Liam Gaffney, J. G. Cubiss, A. Goasduff, E. Giannopoulos, M.L. Jurado-Gómez, A. Illana, Th. Kröll, Herbert Hess, G. Pollarolo, D. Testov, Suzana Szilner, F. Galtarossa, María José García Borge, J. J. Valiente-Dobón, Ch. Fransen, A. Boukhari, J. Snall, F. Recchia, T. Mijatović, L. Corradi, D. R. Napoli, N. Warr, G. Benzoni, D. Rosiak, R. Zidarova, S. Thiel, A. Boso, S. Ceruti, L. Kaya, E. Fioretto, G. G. O'Neill, European Commission, Science and Technology Facilities Council (UK), Croatian Science Foundation, Federal Ministry of Education and Research (Germany), Laboratoire de l'Accélérateur Linéaire (LAL), 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
Population, Nuclear Theory, Binary number, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Particle detector, Nuclear physics, nuclear reaction, transfer reaction, radioactive beam, 0103 physical sciences, Nuclear Reactions, Neutron, Nuclear Physics - Experiment, 010306 general physics, education, Nuclear Experiment, nuclear reactions, Physics, education.field_of_study, isotoopit, Science & Technology, Isotope, 010308 nuclear & particles physics, Physics, Nuclear, Physical Sciences, transfer reactions, Physics::Accelerator Physics, low and intermediate energy heavy-ion reactions, lyijy, models nad methods for nuclear reactions, Nucleon, ydinfysiikka, Beam (structure), Radioactive beam
Abstract

8 pags., 9 figs., We measured absolute cross sections for neutron transfer channels populated in the Rb-94 + Pb-208 binary reaction. Cross sections have been extracted identifying directly the lead isotopes with the high efficiency MINIBALL gamma-ray array coupled to a particle detector combined with a radioactive Rb-94 beam delivered at E-lab = 6.2 MeV/nucleon by the HIE-ISOLDE facility. We observed sizable cross sections in the neutron-rich mass region, where the heavy partner acquires neutrons. A fair agreement between the measured cross sections with those from GRAZING calculations gives confidence in the cross-section predictions of more neutron-rich nuclei produced via a larger number of transferred nucleons., This work was partly supported by the HORIZON 2020 ENSAR2 Grant Agreement no. 654002, and Marie Skłodowska-Curie COFUND (EU-CERN) grant agreement no. 665779, and by STFC (U.K.). This work has been supported in part by the Croatian Science Foundation under Project no. 7194 and in part under Project no. IP-2018-01- 1257, and the German BMBF under contract 05P18PKCIA + Verbundprojekt 05P2018

Published
2020
Full Text
View/download PDF

31. 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

32. Nucleon-nucleon correlation studies in heavy-ion transfer reactions

Author

G. Colucci, L. Corradi, F. Scarlassara, G. Montagnoli, Jelavić D. Malenica, P. Čolović, Alain Goasduff, T. Mijatović, Neven Soić, D. Montanari, F. Galtarossa, E. Fioretto, T. Marchi, J. J. Valiente-Dobón, A. M. Stefanini, S. Szilner, and G. Pollarolo

Subjects
Physics, History, Series (mathematics), Proton, Spectrometer, 010308 nuclear & particles physics, Nuclear Theory, Solid angle, Coulomb barrier, 01 natural sciences, Computer Science Applications, Education, Nuclear physics, 0103 physical sciences, Heavy ion, 010306 general physics, Nucleon, Nuclear Experiment, Open shell, transfer reactions, magnetic spectrometers, nucleon-nucleon correlations
Abstract

We present some of the recent experimental results in heavy-ion transfer reactions obtained with the large solid angle magnetic spectrometer PRISMA at energies close to the Coulomb barrier. We focus on a series of experiments that have been carried out to study the nucleon-nucleon correlations for closed shell and superfluid systems. They are discussed together with the newest results concerning the proton transfer channels above and below the Coulomb barrier. The second set of the experiments was performed to study the production mechanism of heavy neutron-rich nuclei and the related effects of secondary processes.

Published
2020

33. Lifetime measurements of N≃20 phosphorus isotopes using the AGATA γ -ray tracking spectrometer

Author

L. Capponi, A. Gottardo, S. Courtin, E. Fioretto, K. Mulholland, D. Bazzacco, Alain Goasduff, D. Montanari, B. Melon, X. Derkx, F. Haas, A. Pipidis, Tea Mijatović, Thomas Braunroth, A. M. Stefanini, L. Grocutt, Suzana Szilner, C. Michelagnoli, G. Montagnoli, E. Sahin, L. Corradi, V. Liberati, J. J. Valiente-Dobón, D. R. Napoli, P. Désesquelles, C. M. Petrache, Maria Doncel, F. Recchia, M. Bouhelal, D. Mengoni, Robert Chapman, Pushpendra Singh, V. Modamio, and J. F. Smith

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Nuclear structure, Isotopes of phosphorus, Phosphorus Isotopes, 01 natural sciences, Ion, Excited state, 0103 physical sciences, AGATA, Atomic physics, 010306 general physics, Ground state
Abstract

Lifetimes of excited states of the phosphorus isotopes 1533,34,35,36P have been measured by using the differential recoil-distance method. The isotopes of phosphorus were populated in binary grazing reactions initiated by a beam of S36 ions of energy 225 MeV incident on a thin Pb208 target mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were made within the range from about 1 to 100 ps. The number of states for which lifetime measurements were possible was limited by statistics. For P33, lifetime limits were determined for the first 3/2+ and 5/2+ states at 1431 and 1848 keV, respectively; the results are compared with previous published lifetime values. The lifetime of the first 2+ state of P34 at 429 keV was determined and compared with earlier measurements. For P35, the states for which lifetimes, or lifetime limits, were determined were those at 2386, 3860, 4101, and 4493 keV, with Jπ values of 3/2+, 5/2+, 7/21−, and 7/22−, respectively. There have been no previous published lifetimes for states in this nucleus. A lifetime was measured for the stretched π(1f7/2)⊗ν(1f7/2)Jπ=(7+) state of P36 at 5212 keV and a lifetime limit was established for the stretched π(1d3/2)⊗ν(1f7/2)Jπ=(5−) state at 2030 keV. There are no previously published lifetimes for states of P36. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF effective interaction. In addition, measured branching ratios, published mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. In general, there is good agreement between experiment and the shell model; however there is evidence that the shell-model values of the M1 transition rates for the 3/21+→1/2+ (ground state) and 5/21+→3/21+ transitions in P33 underestimate the experimental values by a factor between 5 and 10. In P35 there are some disagreements between experimental and shell-model values of branching ratios for the first and second excited 7/2− states. In particular, there is a serious disagreement for the decay characteristics of the second 7/2− state at 4493 keV, for which the shell-model counterpart lies at 4754 keV. In this case, the shell-model competing electromagnetic decay branches are dominated by E1 and M1 transitions.

Published
2019

34. Isomer spectroscopy of neutron-rich 168Tb103

Author

J. J. Valiente-Dobón, Hiroyoshi Sakurai, P. H. Regan, K. Y. Chae, H. L. Liu, P. Lee, A Yag, V. H. Phong, Zhengyu Xu, H. Baba, Shigeru Kubono, Gavin Lotay, Eunji Lee, Shunji Nishimura, I. Nishizuka, Furong Xu, H. Kanaoka, Eiji Ideguchi, N. Kurz, C-B Moon, Zs. Vajta, C. S. Lee, Philip M Walker, W. N. Catford, C. J. Griffin, F. G. Kondev, Naoki Fukuda, Raymond J. Carroll, T. Isobe, L. A. Gurgi, Alison Bruce, Atsuko Odahara, J. J. Liu, Toshiyuki Kubo, S. Yoshida, Jin Wu, Thamer Alharbi, P-A Soderstrom, István Kuti, Satoru Terashima, C. R. Nita, C. M. Shand, Oliver J. Roberts, Gregory Lane, Giuseppe Lorusso, Zs. Dombrádi, Zena Patel, Zsolt Podolyak, S. Lalkovski, P. Doornenbal, H. Schaffner, Toshiyuki Sumikama, T. Berry, F. Browne, Hiroshi Suzuki, I. Kojouharov, Hiroyuki Takeda, A. Estrade, Naohito Inabe, Hirofumi Watanabe, Z. Korkulu, and G. X. Zhang

Subjects
Radiation, Spectrometer, 010308 nuclear & particles physics, Chemistry, Fission, Nuclear Theory, chemistry.chemical_element, Germanium, 01 natural sciences, Semiconductor detector, Nuclear physics, Excited state, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy
Abstract

In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus 170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified eventby- event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3)

Published
2017

35. 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

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

Author

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

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

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

Published
2019

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

Author

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

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

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

Published
2019

38. New spectroscopic information on Tl211,213 : A changing structure beyond the N=126 shell closure

Author

S. Leoni, Hans Geissel, A. Sharma, Robert Hoischen, A. M. Denis Bacelar, A. Bracco, Enrique Casarejos, N. Goel, Matthew Reed, A. Prochazka, D. Bazzacco, S. M. Lenzi, T.P.D. Swan, Imrich Szarka, N. Al-Dahan, Philip M Walker, T. Habermann, A. Gottardo, J. Benlliure, Andrea Corsi, A. Gadea, S. Klupp, E. Gregor, C. Nociforo, Zs. Dombrádi, Alison Bruce, D. Mengoni, Oliver Wieland, Roberto Vicençotto Ribas, A. I. Morales, M. Bunce, Helmut Weick, A. Y. Deo, F. Nowacki, K. Eppinger, C. Domingo-Pardo, A. Algora, M. L. Cortés, E. Sahin, S. Pietri, M. Bowry, J. Alcántara Núñez, H. Schaffner, F. Naqvi, T. Engert, K. Steiger, R. Janik, F. C. L. Crespi, M. Pfützner, J. Gerl, N. Alkhomashi, Maria Doncel, H. J. Wollersheim, W. Prokopowicz, F. Farinon, B. Million, C. A. Ur, Peter Strmen, Y. Ayyad, Davinder Siwal, S. K. Mandal, Roberto Menegazzo, F. Camera, Enrico Maglione, J. J. Valiente-Dobón, P. Boutachkov, Dirk Rudolph, J. Grebosz, P. R. P. Allegro, S. Lunardi, P. H. Regan, G. de Angelis, G. Benzoni, F. Recchia, D. R. Napoli, G. F. Farrelly, Zs. Podolyák, M. Górska, Branislav Sitar, N. Kurz, and I. Kojouharov

Subjects
Physics, Nuclear physics, Fragmentation (mass spectrometry), chemistry, Isotope, 010308 nuclear & particles physics, 0103 physical sciences, Nuclear structure, chemistry.chemical_element, Gamma spectroscopy, Uranium, 010306 general physics, 01 natural sciences
Abstract

The neutron-rich isotopes 211;213Tl, beyond the N = 126 shell-closure, have been studied for the first time in isomer γ-ray decay, exploiting the fragmentation of a primary uranium beam at the FRS-RISING (FRagment Separator-Rare ISotopes INvestigation at GSI) setup at GSI. The observed isomeric states in 211;213Tl show a deviation from the seniority-like scheme of 209Tl. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.

Published
2019

39. Identification of different reaction channels in $^6$Li + $^{89}$Y experiment by the particles-$\gamma$ coincidence measurement

Author

Shi-Peng Hu, D. Bazzacco, F. Galtarossa, P. R. John, A. Goasduff, J. J. Valiente-Dobón, W. W. Qu, D. Mengoni, M. Siciliano, H. B. Sun, G. L. Zhang, J. B. Xiang, Y. J. Yao, H. Q. Zhang, G. X. Zhang, R. Francesco, M. L. Wang, D. A. Testov, Z. Huang, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, 010308 nuclear & particles physics, QC1-999, Short paper, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Coincidence, Nuclear physics, 0103 physical sciences, Particle, 010306 general physics, Hpge detector
Abstract

This short paper presents the investigation of reaction mechanism induced by 6Li through a particle­γ coincidence measurement. The data have been taken from a 6Li+89Y experimentwhich is performed inINFN-LNL, Italy. In this experiment, the light charged particles are detected by a Si­ball, named EUCLIDES, and the γ rays are collected by a HPGe detector array, called GALILEO. In this contribution, scientific motivations, experimental details and some results, such as α­γ analysis, are presented.

Published
2019

40. Nuclear structure in the neutron-deficient Sn nuclei: TKEL effects on lifetime measurements

Author

J. J. Valiente-Dobón, M. Siciliano, A. Goasduff, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, Spectrometer, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, QC1-999, Nuclear structure, Gating, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 01 natural sciences, Excited state, 0103 physical sciences, AGATA, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

The presence of seniority-like isomers along the Z = 50 isotopic chain have been an experimental limitation to the investigation of the electromagnetic properties of the low-lying states in the light Sn nuclei. Combining a multi-nucleon transfer reaction with the Recoil-Distance Doppler-Shift technique, the lifetimes of the 21+ and 41+ excited states have been directly measured in the neutron-deficient 106, 108Sn isotopes for the very first time. The emitted γ rays were detected by the AGATA array, while the reactionproducts were uniquely identified by the VAMOS++ magnetic spectrometer. The control of the direct feeding of the statesby gating on the Total Kinetic Energy Loss, together with the unique capabilities of the two spectrometers, was crucial for the measurementin 108Sn.

Published
2019

41. Identification of high- K rotation in Ba130 : Testing the consistency of electromagnetic observables

Author

Philip M Walker, D. Mengoni, Song Guo, Jianlu Wang, G. Jaworski, Q. B. Chen, D. Bazzacco, István Kuti, Corina Andreoiu, M. Siciliano, D. R. Napoli, A. C. Dai, Furong Xu, T. Marchlewski, A. Astier, X. H. Zhou, C. M. Petrache, K. Whitmore, A. Tucholski, Bo Cederwall, J. J. Valiente-Dobón, K. Ortner, E. Dupont, A. Boso, F. Galtarossa, J. Srebrny, D. Sohler, B. F. Lv, Y. H. Qiang, A. Goasduff, M. L. Liu, E. A. Lawrie, D. A. Testov, F. Recchia, F. H. Garcia, and S. Riccetto

Subjects
Nuclear physics, Physics, Dipole, 010308 nuclear & particles physics, Consistency (statistics), 0103 physical sciences, Neutron, Observable, 010306 general physics, Rotation, 01 natural sciences, Mixing (physics), High-κ dielectric
Abstract

The band built on the Kπ = 8−, T1/2 = 9.4 ms isomer of 130Ba has been identified, filling the gap in the systematics of the dipole bands built on the 8− isomers in the N = 74 isotones from 128Xe to 138Gd. The use of the GALILEO array in conjunction with its ancillaries EUCLIDES and Neutron Wall, helped to firmly place the newly identified transitions on top of the long-lived isomer. The extracted gK and gR gyromagnetic factors are in agreement with the 7/2+[404] ⊗ 9/2−[514] two-neutron Nilsson configuration. Particle-rotor model calculations give an understanding of the limited degree of K mixing. The experimental information on the Kπ = 8− isomer of 130Ba is now the most complete among the K isomers of the N = 74 isotones.

Published
2019

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

Author

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

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

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

Published
2019

43. Study of the neutron-rich region in the vicinity of 208Pb via multinucleon transfer reactions

Author

Francesco Recchia, E. Fioretto, F. Galtarossa, T. Kröll, Dmitry Testov, Liam Gaffney, Alberto Boso, D. R. Napoli, Maria de La Luz Jurado-Gomez, J. J. Valiente-Dobón, G. Pollarolo, P. Čolović, Daniele Mengoni, L. Corradi, R. Menegazzo, T. Marchi, S. Ceruti, Suzana Szilner, J. G. Cubiss, A. Illana, Tea Mijatović, Zsolt Podolyak, Giacomo de Angelis, G. Benzoni, María José García Borge, European Commission, Istituto Nazionale di Fisica Nucleare, Croatian Science Foundation, de Angelis, G., and Corradi, L.

Subjects
Physics, Nuclear physics, multinucleon transfer reactions, unstable beam, gamma-spectroscpy, 010308 nuclear & particles physics, QC1-999, 0103 physical sciences, Nuclear structure, Neutron, Nuclear Physics - Experiment, 010306 general physics, Nuclear Experiment, 01 natural sciences
Abstract

4 pags-. 4 figs. -- IV International Conference on Nuclear Structure and Dynamics (NSD2019), The multinucleon transfer reaction mechanism was employed to populate isotopes around the doubly-magic 208 Pb nucleus. We used an unstable 94 Rb beam on 208 Pb targets of different thickness. Transfer channels were studied via the fragment-γ and γ-γ coincidences, by using MINIBALL γ spectrometer coupled to a particle detector. Gamma transitions associated to the different Pb isotopes, populated by the neutron transfers, are discussed in terms of excitation energy and spin. Fragment angular distributions were extracted, andcompared with the reaction models.

Published
2019

44. Study of the Neutron-Rich Region in Vicinity of $$^{208}$$ 208 Pb via Multinucleon Transfer Reactions

Author

P. Čolović, J. J. Valiente-Dobón, A. Illana, S. Szilner, and Prisma Galileo Miniball Collaborations

Subjects
Physics, Isotope, Spectrometer, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Flux, Order (ring theory), Nuclear physics, medicine.anatomical_structure, medicine, Physics::Accelerator Physics, Production (computer science), Neutron, Nuclear Experiment, Nucleus, Beam (structure)
Abstract

We exploited a multinucleon transfer reactions with the neutron-rich radioactive beams in order to populate the region around the heaviest doubly-magic nucleus (\(^{208}\)Pb), the region of the nuclear landscape which is rather difficult to reach experimentally. We, thus, recently performed an experiment at HIE-ISOLDE, CERN by using the \(^{94}\)Rb beam onto a thick \(^{208}\)Pb target, and by detecting the reaction products in the high-resolution MINIBALL spectrometer coupled to position sensitive CD detector. With the used method we were able to successfully select the transfer channels of interest and their associated \(\gamma \)-rays. Preliminary analysis shows prevalence of the transfer flux in the direction of the neutron rich Pb isotopes, revealing the mechanism of transfer reactions as a competitive tool for the production of heavy neutron-rich nuclei.

Published
2019

45. Study of medium-spin states of neutron-rich 87, 89, 91Rb isotopes

Author

S. M. Lenzi, A. M. Stefanini, S. J. Freeman, E. Sahin, Baharak Hadinia, P. T. Wady, David O'Donnell, J. F. Smith, C. A. Ur, G. de Angelis, G. Montagnoli, R. Orlandi, Suzana Szilner, M. Labiche, G. S. Simpson, A. Hodsdon, J. Ollier, T. Martinez, Z. M. Wang, A. G. Smith, E. Fioretto, Fernando Scarlassara, D. R. Napoli, V. Kumar, S. Lunardi, G. A. Jones, S. Beghini, M. Axiotis, F. Haas, J. J. Valiente-Dobón, N. Marginean, D. Bazzacco, G. Pollarolo, D. A. Torres, L. Corradi, X. Liang, N. J. Thompson, B. G. Carlsson, Morten Hjorth-Jensen, A. Gadea, D. Mengoni, T. Faul, K. M. Spohr, Th. Kröll, E. Farnea, F. Recchia, R. Mărginean, R. Chapman, F. D. Vedova, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
Physics, Nuclear and High Energy Physics, Spin states, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Yrast, Nuclear Theory, Context (language use), 01 natural sciences, Isotopes of rubidium, Nuclear physics, Excited state, 0103 physical sciences, nuclear structure, Rb isotopes, Physics::Accelerator Physics, Nuclear fusion, Neutron, Nuclear Experiment, 010306 general physics, ydinfysiikka
Abstract

International audience; Excited states of the rubidium isotopes$_{37}^{87, 89, 91}$Rb have been studied at the INFN Legnaro National Laboratory. Measurements of the $\gamma$ -ray decay of fragments produced in binary grazing reactions resulting from the interaction of a beam of 530 MeV$^{96}$Zr ions with a$^{124}$Sn target have been complemented by studies of the $\gamma$ -ray decay of fission fragments produced in the interaction of a beam of 230 MeV$^{36}$S ions with a thick$^{176}$Yb target. The structure of the yrast states of$_{37}^{87, 89, 91}$Rb has been discussed within the context of spherical shell-model and cranked Nilsson-Strutinsky calculations.

Published
2019

46. Diversity of shapes and rotations in the $\gamma$-soft $^{130}$Ba nucleus: First observation of a $t$-band in the $A=130$ mass region

Author

Song Guo, Miao Liu, B. F. Lv, A. Boso, D. Mengoni, Q. B. Chen, István Kuti, E. A. Lawrie, D. R. Napoli, Corina Andreoiu, K. K. Zheng, Torbjörn Bäck, J. J. Valiente-Dobón, M. Siciliano, K. Ortner, Y. H. Qiang, F. Galtarossa, G. Jaworski, J. Srebrny, S. Frauendorf, S. Riccetto, K. Whitmore, Xiaojuan Zhou, Jie Wang, E. Dupont, D. Bazzacco, T. Marchlewski, F. H. Garcia, D. Testov, Dóra Sohler, A. Astier, Y. X. Liu, János Timár, F. Recchia, A. Tucholski, Philip M Walker, Ramon Wyss, A. Goasduff, Bo Cederwall, C. M. Petrache, R. Li, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, Projected shell model, Proton, Nuclear Theory, FOS: Physical sciences, Collective rotations, Nuclear structure, Particle rotor model, Shape coexistence, Tiltid axis cranking, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Rotation, 01 natural sciences, Molecular physics, Nuclear Theory (nucl-th), 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Spin-½, Physics, Spins, 010308 nuclear & particles physics, lcsh:QC1-999, Dipole, Quasiparticle, lcsh:Physics
Abstract

Several new bands have been identified in 130Ba, among which there is one with band-head spin 8+. Its properties are in agreement with the Fermi-aligned \nu h11/2^2 , 7/2+[523] \otimes 9/2-[514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A=130 mass region. The t-band is fed by a dipole band involving two additional h11/2 protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, 130Ba presents one of the best and most complete sets of collective excitations that a gamma-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A = 130 mass region., Comment: 8 pages, 7 figures

Published
2019

47. A new dedicated plunger device for the GALILEO γ-ray detector array

Author

J. Litzinger, A. Goasduff, J. J. Valiente-Dobón, J. Jolie, A. Goldkuhle, F. von Spee, D. Mengoni, G. de Angelis, P. Cocconi, M. Beckers, G. Jawroski, Alfred Dewald, S. Thiel, K. Hadynska-Klek, A. Boso, F. Recchia, A. Gottardo, D. R. Napoli, K. O. Zell, P. R. John, Thomas Braunroth, C. Müller-Gatermann, D. Bazzacco, S. M. Lenzi, C. Fransen, M. Siciliano, R. Menegazzo, D. Testov, and A. Gozzelino

Subjects
Physics, Plunger, Range (particle radiation), Nuclear and High Energy Physics, 010308 nuclear & particles physics, business.industry, Detector, Measure (physics), Lifetimes, 01 natural sciences, Recoil, Optics, Excited state, 0103 physical sciences, 180Pt, Recoil distance Doppler-shift method, Instrumentation, Galileo (vibration training), 010306 general physics, business, Beam (structure)
Abstract

A new device, the GALILEO plunger, has been developed for lifetime measurement studies using the GALILEO γ -ray detector array at the Laboratori Nazionali di Legnaro (LNL) in Legnaro, Italy. This plunger device holds two stretched metal foils in the beam path for the use of the recoil distance Doppler-shift technique in order to measure lifetimes of nuclear excited states in the range of 1 ps to 1 ns. The compact design allows one to combine different auxiliary detectors with the plunger device inside the target chamber and takes care of high γ -ray transparency. The design and control of the device are presented in this paper, together with lifetimes of excited states in 180Pt measured within the first in-beam commissioning run.

Published
2019

48. High-Statistics Sub-Barrier Coulomb Excitation of $^{106,108,110}$Sn

Author

L. Werner, Andrei Andreyev, C. Henrich, Joonas Konki, C. Stahl, C. Berner, B. S. Nara Singh, T. Kröll, E. Rickert, J. Iwanicki, Andreas Görgen, Joakim Cederkäll, Claes Fahlander, A. Welker, S. Viñals, M. Schilling, D. Rosiak, T. Habermann, M. Saxena, C. Berger, Olof Tengblad, Amar Boukhari, C. Raison, J. Park, Gry Merete Tveten, G. de Angelis, J. Snäll, J. J. Valiente-Dobón, P. Reiter, D. M. Cullen, J. G. Cubiss, J. Díaz Ovejas, K. Arnswald, A. Knyazev, Roman Gernhäuser, Liam Gaffney, Daniel Cox, S. Saha, A. Illana, P. Van Duppen, M. Seidlitz, L. Barber, A. Gawlik, P. Golubev, María José García Borge, G. Rainovski, M. Stryjczyk, H. De Witte, T. W. Johansen, T. Berry, Radostina Zidarova, N. Warr, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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
Physics, 010308 nuclear & particles physics, Coulomb excitation, 0103 physical sciences, shell model, Nuclear Physics - Experiment, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, nuclear collectivity
Abstract

International audience; A Coulomb excitation campaign on $^{106,108,110}$Sn at 4.4–4.5 MeV/u was launched at the HIE-ISOLDE facility at CERN. Larger excitation cross sections and γ-ray statistics were achieved compared to previous experiments at ∼2.8 MeV/u. More precise $(B(E2;0_{1}^{ + } \to 2_{1}^{ + }))$ values, lifetimes of states via the Doppler shift attenuation method, and new $(B(E2;0_{1}^{ + } \to 2_{x}^{ + })), (B(E2;2_{1}^{ + } \to 4_{1}^{ + }))$ and $(Q(2_{1}^{ + }))$ values from the new Miniball data will be obtained and applied to test modern nuclear structure theories.

Published
2018

49. K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

Author

P. A. Söderström, C. J. Griffin, Philip M Walker, Shunji Nishimura, Ayumi Yagi, István Kuti, Zhengyu Xu, A. Estrade, Gavin Lotay, N. Kurz, P. Lee, S. Lalkovski, S. Terashima, V. H. Phong, P. Doornenbal, F. Browne, Naoki Fukuda, Raymond J. Carroll, Thamer Alharbi, H. L. Liu, Zs. Vajta, Oliver J. Roberts, Zs. Podolyák, C. S. Lee, C. M. Shand, Hidetada Baba, D.S. Ahn, Zs. Dombrádi, Alison Bruce, Shigeru Kubono, K. Y. Chae, S. Kanaya, Furong Xu, J. J. Liu, H. Kanaoka, Zena Patel, C. R. Niţă, I. Nishizuka, Atsuko Odahara, Toshiyuki Sumikama, Hiroyuki Takeda, G. J. Lane, Toshiyuki Kubo, Hiroyoshi Sakurai, E. J. Lee, P. H. Regan, G. X. Zhang, H. Schaffner, Eiji Ideguchi, Naohito Inabe, Hirofumi Watanabe, Tadaaki Isobe, Chang-Bum Moon, Z. Korkulu, Hiroshi Suzuki, I. Kojouharov, J. J. Valiente-Dobón, Jin Wu, G. Lorusso, and F. G. Kondev

Subjects
Mid-shell, Nuclear and High Energy Physics, Shell (structure), chemistry.chemical_element, 01 natural sciences, K isomer, 0103 physical sciences, medicine, Physics::Atomic and Molecular Clusters, Dysprosium, Gamma spectroscopy, ddc:530, Nuclide, 010306 general physics, γ-Ray spectroscopy, Physics, 010308 nuclear & particles physics, Yrast, lcsh:QC1-999, medicine.anatomical_structure, chemistry, Atomic physics, Nucleus, Order of magnitude, Excitation, lcsh:Physics
Abstract

Physics letters / B 762, 404 - 408 (2016). doi:10.1016/j.physletb.2016.09.058, Published by North-Holland Publ., Amsterdam

Published
2016
Full Text
View/download PDF

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

Author

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

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

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

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results