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Title: Neutron single-particle strengths at N=40, 42: Neutron knockout from Ni68,70 ground and isomeric states

The distribution of single-particle strength in 67,69Ni was characterized with one-neutron knockout reactions from intermediate-energy 68,70Ni 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, is used to identify and quantify neutron configurations in the wave functions. While 69Ni compares well to shell-model predictions, the results for 67Ni challenge the validity of current effective shell-model Hamiltonians by revealing discrepancies that cannot be explained so far. Furthermore, these results suggest that our understanding of the low-lying states in the neutron-rich, semi-magic Ni isotopes may be incomplete and requires further investigation on both the experimental and theoretical sides.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4] ;  [2] ;  [5] ;  [2] ;  [2] ;  [2] ;  [6] ;  [4] ;  [7] ;  [8] ;  [6] ;  [4] ;  [4] ;  [9] ;  [2] more »;  [4] ;  [2] ;  [2] ;  [2] ;  [2] ;  [10] ;  [11] ;  [12] ;  [4] « less
  1. Michigan State Univ., East Lansing, MI (United States); Univ. degli Studi di Padova and INFN Padova, Padova (Italy)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Univ. of Surrey, Surrey (United Kingdom)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Michigan State Univ., East Lansing, MI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Argonne National Lab. (ANL), Argonne, IL (United States); Michigan State Univ., East Lansing, MI (United States)
  8. Argonne National Lab. (ANL), Argonne, IL (United States); U.S. Army Research Lab., Adelphi, MD (United States)
  9. Argonne National Lab. (ANL), Argonne, IL (United States); CSNSM-IN2P3/CNRS, Orsay Campus (France)
  10. Michigan State Univ., East Lansing, MI (United States); TRIUMF, Vancouver, BC (Canada)
  11. Michigan State Univ., East Lansing, MI (United States); Univ. of California, Berkeley, CA (United States)
  12. Michigan State Univ., East Lansing, MI (United States); Central Michigan Univ., Mount Pleasant, MI (United States); The Univ. of Tokyo, Tokyo (Japan)
Publication Date:
OSTI Identifier:
1379593
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231; FG02-08ER41556; FG02-94-ER40834; NA0000979
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 5; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS