Shape Coexistence at Zero Spin in < /SUP>64< //SUP>Ni Driven by the Monopole Tensor Interaction

Marginean, N; Little, D; Tsunoda, Y; Leoni, S; Janssens, RVF; Fornal, B; Otsuka, T; Michelagnoli, C; Stan, L; Crespi, FCL; Costache, C; Lica, R; Sferrazza, M; Turturica, A; Ayangeakaa, AD; Auranen, K; Barani, M; Bender, PC; Bottoni, S; Boromiza, M; Bracco, A; Calinescu, S; Campbell, CM; Carpenter, MP; Chowdhury, P; Ciemala, M; Cieplicka-Orynczak, N; Cline, D; Clisu, C; Crawford, HL; Dinescu, IE; Dudouet, J; Filipescu, D; Florea, N; Forney, AM; Fracassetti, S; Gade, A; Gheorghe, I; Hayes, AB; Harca, I; Henderson, J; Ionescu, A; Iskra, LW; Jentschel, M; Kandzia, F; Kim, YH; Kondev, FG; Korschinek, G; Koster, U; Krishichayan,; Krzysiek, M; Lauritsen, T; Li, J; Marginean, R; Maugeri, EA; Mihai, C; Mihai, RE; Mitu, A; Mutti, P; Negret, A; Nita, CR; Olacel, A; Oprea, A; Pascu, S; Petrone, C; Porzio, C; Rhodes, D; Seweryniak, D; Schumann, D; Sotty, C; Stolze, SM; Suvaila, R; Toma, S; Ujeniuc, S; Walters, WB; Wu, CY; Wu, J; Zhu, S; Ziliani, S

doi:10.1103/PhysRevLett.125.102502

Shape Coexistence at Zero Spin in < /SUP>64< //SUP>Ni Driven by the Monopole Tensor Interaction

Author:

Marginean, N

Little, D ; Tsunoda, Y ; Leoni, S ; Janssens, RVF ; Fornal, B ; Otsuka, T ; Michelagnoli, C ; Stan, L ; Crespi, FCL ; Costache, C ; Lica, R ; Sferrazza, M ; Turturica, A ; Ayangeakaa, AD ; Auranen, K ; Barani, M ; Bender, PC ; Bottoni, S ; Boromiza, M ; Bracco, A ; Calinescu, S ; Campbell, CM ; Carpenter, MP ; Chowdhury, P ; Ciemala, M ; Cieplicka-Orynczak, N ; Cline, D ; Clisu, C ; Crawford, HL ; Dinescu, IE ; Dudouet, J ; Filipescu, D ; Florea, N ; Forney, AM ; Fracassetti, S ; Gade, A ; Gheorghe, I ; Hayes, AB ; Harca, I ; Henderson, J ; Ionescu, A ; Iskra, LW ; Jentschel, M ; Kandzia, F ; Kim, YH ; Kondev, FG ; Korschinek, G ; Koster, U ; Krishichayan, ; Krzysiek, M ; Lauritsen, T ; Li, J ; Marginean, R ; Maugeri, EA ; Mihai, C ; Mihai, RE ; Mitu, A ; Mutti, P ; Negret, A ; Nita, CR ; Olacel, A ; Oprea, A ; Pascu, S ; Petrone, C ; Porzio, C ; Rhodes, D ; Seweryniak, D ; Schumann, D ; Sotty, C ; Stolze, SM ; Suvaila, R ; Toma, S ; Ujeniuc, S ; Walters, WB ; Wu, CY ; Wu, J ; Zhu, S ; Ziliani, S

Keywords:

Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, TRANSITION, STATES, 01 Mathematical Sciences, 02 Physical Sciences, 09 Engineering, General Physics, 40 Engineering, 49 Mathematical sciences, 51 Physical sciences

Abstract:

The low-spin structure of the semimagic ^{64}Ni 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.