학술논문
Shape Coexistence at Zero Spin in 64Ni Driven by the Monopole Tensor Interaction
Document Type
Working Paper
Author
Mărginean, N.; Little, D.; Tsunoda, Y.; Leoni, S.; Janssens, R. V. F.; Fornal, B.; Otsuka, T.; Michelagnoli, C.; Stan, L.; Crespi, F. C. L.; Costache, C.; Lica, R.; Sferrazza, M.; Turturica, A.; Ayangeakaa, A. D.; Auranen, K.; Barani, M.; Bender, P. C.; Bottoni, S.; Boromiza, M.; Bracco, A.; Călinescu, S.; Campbell, C. M.; Carpenter, M. P.; Chowdhury, P.; Ciemała, M.; Cieplicka-Orynczak, N.; Cline, D.; Clisu, C.; Crawford, H. L.; Dinescu, I. E.; Filipescu, D.; Florea, N.; Forney, A. M.; Fracassetti, S.; Gade, A.; Gheorghe, I.; Hayes, A. B.; Harca, I.; Henderson, J.; Ionescu, A.; Iskra, Ł. W.; Jentschel, M.; Kandzia, F.; Kim, Y. H.; Kondev, F. G.; Korschinek, G.; Köster, U.; Krishichayan; Krzysiek, M.; Lauritsen, T.; Li, J.; Mărginean, R.; Maugeri, E. A.; Mihai, C.; Mihai, R. E.; Mitu, A.; Mutti, P.; Negret, A.; Niţă, C. R.; Olăcel, A.; Oprea, A.; Pascu, S.; Petrone, C.; Porzio, C.; Rhodes, D.; Seweryniak, D.; Schumann, D.; Sotty, C.; Stolze, S. M.; Şuvăilă, R.; Toma, S.; Ujeniuc, S.; Walters, W. B.; Wu, C. Y.; Wu, J.; Zhu, S.; Ziliani, S.
Source
Physical Review Letters 125, 102502 (2020)
Subject
Language
Abstract
The low-spin structure of the semimagic 64Ni 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.