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arxiv: 2008.04857 · v1 · pith:DGJ4BVRAnew · submitted 2020-08-11 · ⚛️ nucl-ex · nucl-th

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

N. M\u{a}rginean , D. Little , Y. Tsunoda , S. Leoni , R. V. F. Janssens , B. Fornal , T. Otsuka , C. Michelagnoli
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L. Stan F. C. L. Crespi C. Costache R. Lica M. Sferrazza A. Turturica A. D. Ayangeakaa K. Auranen M. Barani P. C. Bender S. Bottoni M. Boromiza A. Bracco S. C\u{a}linescu C. M. Campbell M. P. Carpenter P. Chowdhury M. Ciema{\l}a N. Cieplicka-Orynczak D. Cline C. Clisu H. L. Crawford I. E. Dinescu D. Filipescu N. Florea A. M. Forney S. Fracassetti A. Gade I. Gheorghe A. B. Hayes I. Harca J. Henderson A. Ionescu {\L}.W. Iskra M. Jentschel F. Kandzia Y. H. Kim F. G. Kondev G. Korschinek U. K\"oster Krishichayan M. Krzysiek T. Lauritsen J. Li R. M\u{a}rginean E. A. Maugeri C. Mihai R. E. Mihai A. Mitu P. Mutti A. Negret C. R. Ni\c{t}\u{a} A. Ol\u{a}cel A. Oprea S. Pascu C. Petrone C. Porzio D. Rhodes D. Seweryniak D. Schumann C. Sotty S. M. Stolze R. \c{S}uv\u{a}il\u{a} S. Toma S. Ujeniuc W. B. Walters C. Y. Wu J. Wu S. Zhu S. Ziliani
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classification ⚛️ nucl-ex nucl-th
keywords energyexcitationinteractionmonopoleprolateaboveaccountsacross
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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.

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