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Nucleon correlations and the structure of Zn413071

  • Author(s): 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
  • et al.
Abstract

© 2017 The Author(s) 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.

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