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

Mărginean, N.; Little, D.; Tsunoda, Y.; Leoni, S.; Janssens, R. . .; Fornal, B.; Otsuka, T.; Michelagnoli, C.; Stan, L.; Crespi, F. . .; Costache, C.; Lica, R.; Sferrazza, M.; Turturica, A.; Ayangeakaa, A. .; Auranen, K.; Barani, M.; Bender, P. .; Bottoni, S.; Boromiza, M.; Bracco, A.; Călinescu, S.; Campbell, C. .; Carpenter, M. .; Chowdhury, P.; Ciemała, M.; Cieplicka-Oryǹczak, N.; Cline, D.; Clisu, C.; Crawford, H. .; Dinescu, I. .; Dudouet, J.; Filipescu, D.; Florea, N.; Forney, A. .; Fracassetti, S.; Gade, A.; Gheorghe, I.; Hayes, A. .; Harca, I.; Henderson, J.; Ionescu, A.; Iskra, Ł. .; Jentschel, M.; Kandzia, F.; Kim, Y. .; Kondev, F. .; Korschinek, G.; Köster, U.; Krishichayan, N.; Krzysiek, M.; Lauritsen, T.; Li, J.; Mărginean, R.; Maugeri, E. .; Mihai, C.; Mihai, R. .; Mitu, A.; Mutti, P.; Negret, A.; Niţă, C. .; Olăcel, A.; Oprea, A.; Pascu, S.; Petrone, C.; Porzio, C.; Rhodes, D.; Seweryniak, D.; Schumann, D.; Sotty, C.; Stolze, S. .; Şuvăilă, R.; Toma, S.; Ujeniuc, S.; Walters, W. .; C.  Y., W.; Wu, J.; Zhu, S.; Ziliani, S.

doi:10.1103/PhysRevLett.125.102502

The low-spin structure of the semimagic Ni64 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.

Shape Coexistence at Zero Spin in Ni 64 Driven by the Monopole Tensor Interaction / N. Mărginean, D. Little, Y. Tsunoda, S. Leoni, R. . . Janssens, B. Fornal, T. Otsuka, C. Michelagnoli, L. Stan, F. . . Crespi, C. Costache, R. Lica, M. Sferrazza, A. Turturica, A. . Ayangeakaa, K. Auranen, M. Barani, P. . Bender, S. Bottoni, M. Boromiza, A. Bracco, S. Călinescu, C. . Campbell, M. . Carpenter, P. Chowdhury, M. Ciemała, N. Cieplicka-Oryǹczak, D. Cline, C. Clisu, H. . Crawford, I. . Dinescu, J. Dudouet, D. Filipescu, N. Florea, A. . Forney, S. Fracassetti, A. Gade, I. Gheorghe, A. . Hayes, I. Harca, J. Henderson, A. Ionescu, Ł. . Iskra, M. Jentschel, F. Kandzia, Y. . Kim, F. . Kondev, G. Korschinek, U. Köster, N. Krishichayan, M. Krzysiek, T. Lauritsen, J. Li, R. Mărginean, E. . Maugeri, C. Mihai, R. . Mihai, A. Mitu, P. Mutti, A. Negret, C. . Niţă, A. Olăcel, A. Oprea, S. Pascu, C. Petrone, C. Porzio, D. Rhodes, D. Seweryniak, D. Schumann, C. Sotty, S. . Stolze, R. Şuvăilă, S. Toma, S. Ujeniuc, W. . Walters, C. . Wu, J. Wu, S. Zhu, S. Ziliani. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 125:10(2020), pp. 102502.1-102502.7. [10.1103/PhysRevLett.125.102502]

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

Mărginean, N.;Little, D.;Tsunoda, Y.;S. Leoni;Janssens, R. V. F.;Fornal, B.;Otsuka, T.;Michelagnoli, C.;Stan, L.;F. . . Crespi;Costache, C.;Lica, R.;Sferrazza, M.;Turturica, A.;Ayangeakaa, A. D.;Auranen, K.;Barani, M.;Bender, P. C.;S. Bottoni;Boromiza, M.;A. Bracco;Călinescu, S.;Campbell, C. M.;Carpenter, M. P.;Chowdhury, P.;Ciemała, M.;Cieplicka-Oryǹczak, N.;Cline, D.;Clisu, C.;Crawford, H. L.;Dinescu, I. E.;Dudouet, J.;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, null;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.;C. Porzio;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.;S. Ziliani

2020

Abstract

The low-spin structure of the semimagic Ni64 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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				Settore FIS/04 - Fisica Nucleare e Subnucleare
			
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				2020
			
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				PHYSICAL REVIEW LETTERS
			
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				https://dx.doi.org/10.1103/PhysRevLett.125.102502
			
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