The low-spin structure of the semimagic Ni64 nucleus has been considerably expanded: combining four experiments, several 0+ and 2+ excited states were identified below 4.5 MeV, and their properties established. The Monte Carlo shell model accounts for the results and unveils an unexpectedly complex landscape of coexisting shapes: a prolate 0+ excitation is located at a surprisingly high energy (3463 keV), with a collective 2+ state 286 keV above it, the first such observation in Ni isotopes. The evolution in excitation energy of the prolate minimum across the neutron N=40 subshell gap highlights the impact of the monopole interaction and its variation in strength with N.

Shape Coexistence at Zero Spin in Ni 64 Driven by the Monopole Tensor Interaction / N. Mărginean, D. Little, Y. Tsunoda, S. Leoni, R. . . Janssens, B. Fornal, T. Otsuka, C. Michelagnoli, L. Stan, F. . . Crespi, C. Costache, R. Lica, M. Sferrazza, A. Turturica, A. . Ayangeakaa, K. Auranen, M. Barani, P. . Bender, S. Bottoni, M. Boromiza, A. Bracco, S. Călinescu, C. . Campbell, M. . Carpenter, P. Chowdhury, M. Ciemała, N. Cieplicka-Oryǹczak, D. Cline, C. Clisu, H. . Crawford, I. . Dinescu, J. Dudouet, D. Filipescu, N. Florea, A. . Forney, S. Fracassetti, A. Gade, I. Gheorghe, A. . Hayes, I. Harca, J. Henderson, A. Ionescu, Ł. . Iskra, M. Jentschel, F. Kandzia, Y. . Kim, F. . Kondev, G. Korschinek, U. Köster, N. Krishichayan, M. Krzysiek, T. Lauritsen, J. Li, R. Mărginean, E. . Maugeri, C. Mihai, R. . Mihai, A. Mitu, P. Mutti, A. Negret, C. . Niţă, A. Olăcel, A. Oprea, S. Pascu, C. Petrone, C. Porzio, D. Rhodes, D. Seweryniak, D. Schumann, C. Sotty, S. . Stolze, R. Şuvăilă, S. Toma, S. Ujeniuc, W. . Walters, C. . Wu, J. Wu, S. Zhu, S. Ziliani. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 125:10(2020), pp. 102502.1-102502.7. [10.1103/PhysRevLett.125.102502]

Shape Coexistence at Zero Spin in Ni 64 Driven by the Monopole Tensor Interaction

S. Leoni;F. . . Crespi;S. Bottoni;A. Bracco;C. Porzio;S. Ziliani
2020

Abstract

The low-spin structure of the semimagic Ni64 nucleus has been considerably expanded: combining four experiments, several 0+ and 2+ excited states were identified below 4.5 MeV, and their properties established. The Monte Carlo shell model accounts for the results and unveils an unexpectedly complex landscape of coexisting shapes: a prolate 0+ excitation is located at a surprisingly high energy (3463 keV), with a collective 2+ state 286 keV above it, the first such observation in Ni isotopes. The evolution in excitation energy of the prolate minimum across the neutron N=40 subshell gap highlights the impact of the monopole interaction and its variation in strength with N.
Settore FIS/04 - Fisica Nucleare e Subnucleare
2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/771374
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