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Shape coexistence at zero spin in64Ni driven by the monopole tensor interaction
Physical Review Letters ( IF 8.385 ) Pub Date : 
N. Mărginean et al.

The low-spin structure of the semi-magic 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 sub-shell gap highlights the impact of the monopole interaction and its variation in strength with N.
更新日期:2020-08-01

 

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