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New low-energy 0+ state and shape coexistence in Ni 70

  • Author(s): Prokop, CJ;
  • Crider, BP;
  • Liddick, SN;
  • Ayangeakaa, AD;
  • Carpenter, MP;
  • Carroll, JJ;
  • Chen, J;
  • Chiara, CJ;
  • David, HM;
  • Dombos, AC;
  • Go, S;
  • Harker, J;
  • Janssens, RVF;
  • Larson, N;
  • Lauritsen, T;
  • Lewis, R;
  • Quinn, SJ;
  • Recchia, F;
  • Seweryniak, D;
  • Spyrou, A;
  • Suchyta, S;
  • Walters, WB;
  • Zhu, S
  • et al.
Abstract

In recent models, the neutron-rich Ni isotopes around N=40 are predicted to exhibit multiple low-energy excited 0+ states attributed to neutron and proton excitations across both the N=40 and Z=28 shell gaps. In Ni68, the three observed 0+ states have been interpreted in terms of triple shape coexistence between spherical, oblate, and prolate deformed shapes. In the present work a new (02+) state at an energy of 1567 keV has been discovered in Ni70 by using β-delayed, γ-ray spectroscopy following the decay of Co70. The precipitous drop in the energy of the prolate-deformed 0+ level between Ni68 and Ni70 with the addition of two neutrons compares favorably with results of Monte Carlo shell-model calculations carried out in the large fpg9/2d5/2 model space, which predict a 02+ state at 1525 keV in Ni70. The result extends the shape-coexistence picture in the region to Ni70 and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei.

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