Skip to main content
eScholarship
Open Access Publications from the University of California

Neutron single-particle strengths at N=40, 42: Neutron knockout from Ni 68,70 ground and isomeric states

  • Author(s): Recchia, F;
  • Weisshaar, D;
  • Gade, A;
  • Tostevin, JA;
  • Janssens, RVF;
  • Albers, M;
  • Bader, VM;
  • Baugher, T;
  • Bazin, D;
  • Berryman, JS;
  • Brown, BA;
  • Campbell, CM;
  • Carpenter, MP;
  • Chen, J;
  • Chiara, CJ;
  • Crawford, HL;
  • Hoffman, CR;
  • Kondev, FG;
  • Korichi, A;
  • Langer, C;
  • Lauritsen, T;
  • Liddick, SN;
  • Lunderberg, E;
  • Noji, S;
  • Prokop, C;
  • Stroberg, SR;
  • Suchyta, S;
  • Wimmer, K;
  • Zhu, S
  • et al.
Abstract

The distribution of single-particle strength in Ni67,69 was characterized with one-neutron knockout reactions from intermediate-energy Ni68,70 secondary beams, selectively populating neutron-hole configurations at N=39 and 41, respectively. The spectroscopic strengths deduced from the measured partial cross sections to the individual final states, as tagged by their γ-ray decays, are used to identify and quantify neutron configurations in the wave functions. While Ni69 compares well with shell-model predictions, the results for Ni67 challenge the validity of current effective shell-model Hamiltonians by revealing discrepancies that cannot be explained so far. These results suggest that our understanding of the low-lying states in the neutron-rich, semimagic Ni isotopes may be incomplete and requires further investigation on both the experimental and theoretical sides.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View