Shape Coexistence at Zero Spin in 64Ni Driven by the Monopole Tensor Interaction
Nuclear Experiment
2020-09-04 v1 Nuclear Theory
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.
Cite
@article{arxiv.2008.04857,
title = {Shape Coexistence at Zero Spin in 64Ni Driven by the Monopole Tensor Interaction},
author = {N. Mărginean and D. Little and Y. Tsunoda and S. Leoni and R. V. F. Janssens and B. Fornal and T. Otsuka and C. Michelagnoli and L. Stan and F. C. L. Crespi and C. Costache and R. Lica and M. Sferrazza and A. Turturica and A. D. Ayangeakaa and K. Auranen and M. Barani and P. C. Bender and S. Bottoni and M. Boromiza and A. Bracco and S. Călinescu and C. M. Campbell and M. P. Carpenter and P. Chowdhury and M. Ciemała and N. Cieplicka-Orynczak and D. Cline and C. Clisu and H. L. Crawford and I. E. Dinescu and D. Filipescu and N. Florea and A. M. Forney and S. Fracassetti and A. Gade and I. Gheorghe and A. B. Hayes and I. Harca and J. Henderson and A. Ionescu and Ł. W. Iskra and M. Jentschel and F. Kandzia and Y. H. Kim and F. G. Kondev and G. Korschinek and U. Köster and Krishichayan and M. Krzysiek and T. Lauritsen and J. Li and R. Mărginean and E. A. Maugeri and C. Mihai and R. E. Mihai and A. Mitu and P. Mutti and A. Negret and C. R. Niţă and A. Olăcel and A. Oprea and S. Pascu and C. Petrone and C. Porzio and D. Rhodes and D. Seweryniak and D. Schumann and C. Sotty and S. M. Stolze and R. Şuvăilă and S. Toma and S. Ujeniuc and W. B. Walters and C. Y. Wu and J. Wu and S. Zhu and S. Ziliani},
journal= {arXiv preprint arXiv:2008.04857},
year = {2020}
}