Abstract
Intermediate-energy Coulomb excitation measurements were performed on the neutron-rich isotopes Cr. The electric quadrupole excitation strengths, (2; 0), of Cr are determined for the first time. The results quantify the trend of increasing quadrupole collectivity in the Cr isotopes approaching neutron number . The results are confronted with large-scale shell-model calculations in the shell using the state-of-the-art LNPS effective interaction. Different sets of effective charges are discussed that provide an improved and robust description of the values of the neutron-rich Fe and Cr isotopes in this region of rapid shell evolution. The ratio of the neutron and proton transition matrix elements, , is proposed as an effective tool to discriminate between the various choices of effective charges.
- Received 16 May 2012
DOI:https://doi.org/10.1103/PhysRevC.86.011305
©2012 American Physical Society