학술논문
Nucleon correlations and the structure of Zn 41 30 71
Document Type
article
Author
Bottoni, S; Zhu, S; Janssens, RVF; Carpenter, MP; Tsunoda, Y; Otsuka, T; Macchiavelli, AO; Cline, D; Wu, CY; Ayangeakaa, AD; Bucher, B; Buckner, MQ; Campbell, CM; Chiara, CJ; Crawford, HL; Cromaz, M; David, HM; Fallon, P; Gade, A; Greene, JP; Harker, J; Hayes, AB; Hoffman, CR; Kay, BP; Korichi, A; Lauritsen, T; Sethi, J; Seweryniak, D; Walters, WB; Weisshaar, D; Wiens, A
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Subject
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Abstract
The structure of 71Zn 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 pfg9/2d5/2 valence space. Similarities with the structure of Ni402868 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-II shell evolution, with an emphasis on proton–neutron correlations between valence nucleons, especially those involving the shape-driving g9/2 neutron orbital.