Intermediate-energy Coulomb excitation of 58 ,60 ,62Cr: The onset of collectivity toward N=40

T. Baugher, A. Gade, R. V F Janssens, S. M. Lenzi, D. Bazin, B. A. Brown, M. P. Carpenter, A. N. Deacon, S. J. Freeman, T. Glasmacher, G. F. Grinyer, F. G. Kondev, S. McDaniel, A. Poves, A. Ratkiewicz, E. A. McCutchan, D. K. Sharp, I. Stefanescu, K. A. Walsh, D. WeisshaarS. Zhu

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    Intermediate-energy Coulomb excitation measurements were performed on the neutron-rich isotopes 58 ,60 ,62Cr. The electric quadrupole excitation strengths, B(E2; 01+→21+), of 60 ,62Cr are determined for the first time. The results quantify the trend of increasing quadrupole collectivity in the Cr isotopes approaching neutron number N=40. The results are confronted with large-scale shell-model calculations in the fpgd 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 B(E2) 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, |M n/M p|, is proposed as an effective tool to discriminate between the various choices of effective charges. © 2012 American Physical Society.
    Original languageEnglish
    Article number011305
    JournalPhysical Review C - Nuclear Physics
    Issue number1
    Publication statusPublished - 26 Jul 2012


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