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.

Transition strengths in the neutron-rich Ni-73,Ni-74,Ni-75 isotopes / A. Gottardo, G. De Angelis, P. Doornenbal, L. Coraggio, A. Gargano, N. Itaco, K. Kaneko, P. Van Isacker, T. Furumoto, G. Benzoni, J. Lee, H. Liu, M. Matsushita, D. Mengoni, V. Modamio-Hoybjor, S. Momiyama, T. Motobayashi, D.R. Napoli, M. Niikura, E. Sahin, Y. Shiga, H. Sakurai, R. Taniuchi, S. Takeuchi, H. Wang, J.J. Valiente-Dobon, R. Avigo, H. Baba, N. Blasi, F.L. Bello Garrote, F. Browne, F.C.L. Crespi, S. Ceruti, R. Daido, M.-. Delattre, D. Fang, Z. Dombradi, T. Isobe, I. Kuti, G. Lorusso, K. Matsui, B. Melon, T. Miyazaki, S. Nishimura, R. Orlandi, Z. Patel, S. Rice, L. Sinclair, P.A. Soderstrom, D. Sohler, T. Sumikama, J. Taprogge, Z. Vajta, H. Watanabe, O. Wieland, J. Wu, Z.Y. Xu, M. Yalcinkaya, R. Yokoyama. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 102:1(2020 Jul 28), pp. 014323.014323-1-014323.014323-8. [10.1103/PhysRevC.102.014323]

Transition strengths in the neutron-rich Ni-73,Ni-74,Ni-75 isotopes

F.C.L. Crespi;
2020

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.
Settore FIS/04 - Fisica Nucleare e Subnucleare
Settore FIS/01 - Fisica Sperimentale
28-lug-2020
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/792223
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