The structure of Zn-71 was investigated by one-neutron transfer and heavy-ion induced complex (deep-inelastic) reactions using the GRETINA-CHICO2 and the Gammasphere setups, respectively. The observed inversion between the 9/2(+) and 1/2(-) states is explained in terms of the role of neutron pairing correlations. Non-collective sequences of levels were delineated above the 9/2+ isomeric state. These are interpreted as being associated with a modest oblate deformation in the framework of Monte-Carlo shell-model calculations carried out with the A3DA-m Hamiltonian in the pfg(9/2)d(5/2) valence space. Similarities with the structure of Ni-68(28)40 were observed and the shape-coexistence mechanism in the N = 40 region of neutron-rich nuclei is discussed in terms of the so-called Type-IIshell evolution, with an emphasis on proton-neutron correlations between valence nucleons, especially those involving the shape-driving g(9/2) neutron orbital.
Nucleon correlations and the structure of Zn413071 / S. Bottoni, S. Zhu, R.V.F. Janssens, M.P. Carpenter, Y. Tsunoda, T. Otsuka, A.O. Macchiavelli, D. Cline, C.Y. Wu, A.D. Ayangeakaa, B. Bucher, M.Q. Buckner, C.M. Campbell, C.J. Chiara, H.L. Crawford, M. Cromaz, H.M. David, P. Fallon, A. Gade, J.P. Greene, J. Harker, A.B. Hayes, C.R. Hoffman, B.P. Kay, A. Korichi, T. Lauritsen, J. Sethi, D. Seweryniak, W.B. Walters, D. Weisshaar, A. Wiens. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 775:(2017 Dec 10), pp. 271-276. [10.1016/j.physletb.2017.11.003]
Nucleon correlations and the structure of Zn413071
S. Bottoni
Primo
;
2017
Abstract
The structure of Zn-71 was investigated by one-neutron transfer and heavy-ion induced complex (deep-inelastic) reactions using the GRETINA-CHICO2 and the Gammasphere setups, respectively. The observed inversion between the 9/2(+) and 1/2(-) states is explained in terms of the role of neutron pairing correlations. Non-collective sequences of levels were delineated above the 9/2+ isomeric state. These are interpreted as being associated with a modest oblate deformation in the framework of Monte-Carlo shell-model calculations carried out with the A3DA-m Hamiltonian in the pfg(9/2)d(5/2) valence space. Similarities with the structure of Ni-68(28)40 were observed and the shape-coexistence mechanism in the N = 40 region of neutron-rich nuclei is discussed in terms of the so-called Type-IIshell evolution, with an emphasis on proton-neutron correlations between valence nucleons, especially those involving the shape-driving g(9/2) neutron orbital.
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