Intermediate-energy Coulomb excitation of58,60,62Cr: The onset of collectivity towardN=40
| Autor: | S. Zhu, D. K. Sharp, M. P. Carpenter, Alfredo Poves, D. Weisshaar, I. Stefanescu, A. N. Deacon, S. J. Freeman, K. A. Walsh, F. G. Kondev, E. A. McCutchan, G. F. Grinyer, S. McDaniel, T. Glasmacher, Alexandra Gade, R. V. F. Janssens, D. Bazin, S. M. Lenzi, T.R. Baugher, A. Ratkiewicz, B. A. Brown |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physical Review C. 86 |
| ISSN: | 1089-490X 0556-2813 |
| Popis: | Intermediate-energy Coulomb excitation measurements were performed on the neutron-rich isotopes ${}^{58,60,62}$Cr. The electric quadrupole excitation strengths, $B$($E$2; 0${}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+}$), of ${}^{60,62}$Cr 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. |
| Databáze: | OpenAIRE |
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