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

F. Recchia et al.
Phys. Rev. C 94, 054324 – Published 28 November 2016
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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.

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  • Received 7 September 2016

DOI:https://doi.org/10.1103/PhysRevC.94.054324

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 94, Iss. 5 — November 2016

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