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Relativistic Coulomb excitation of neutron-rich54,56,58Cr: On the pathway of magicity from [formula omitted]to [formula omitted]

Authors
Journal
Physics Letters B
0370-2693
Publisher
Elsevier
Publication Date
Volume
622
Identifiers
DOI: 10.1016/j.physletb.2005.07.004
Keywords
  • Experiments

Abstract

Abstract The first excited 2 + states in 54,56,58Cr were populated by Coulomb excitation at relativistic energies and γ rays were measured using the RISING setup at GSI. For 56Cr and 58Cr the B ( E2 , 2 1 + → 0 + ) values relative to the previously known B ( E 2 ) value for 54Cr are determined as 8.7(3.0) and 14.8(4.2) W.u., respectively. The results are consistent with a subshell closure at neutron number N = 32 which was already indicated by the higher energy of the 2 1 + state in 56Cr. Recent large-scale shell model calculations using effective interactions reproduce the trend in the excitation energies, but fail to account for the minimum in the B ( E 2 ) values at N = 32 .

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