Quadrupole collectivity beyond N=50 in neutron-rich Se and Kr isotopes
| Autor: | E. Lunderberg, W. B. Walters, Kathrin Wimmer, N. Terpstra, K. W. Kemper, Brandon Elman, P. C. Bender, D. Weisshaar, N. Sachmpazidi, Daniel Bazin, Alexandra Gade, S. Lipschutz, M. Bowry, A. Westerberg, S. J. Williams, D. Barofsky, M. Hjorth-Jensen |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Physical Review C. 96 |
| ISSN: | 2469-9993 2469-9985 |
| DOI: | 10.1103/physrevc.96.044332 |
| Popis: | We report $B(E2;{0}_{1}^{+}\ensuremath{\rightarrow}{2}_{n}^{+})$ strengths for the neutron-rich $^{88,90}\mathrm{Kr}$ and $^{86}\mathrm{Se}$ isotopes from intermediate-energy Coulomb excitation. The electric quadrupole transition strengths to the first ${2}^{+}$ states complete, with considerably improved uncertainties, the evolution of quadrupole collectivity in the Kr and Se isotopes approaching $N=60$, for which $^{90}\mathrm{Kr}$ and $^{86}\mathrm{Se}$ had previously been the most uncertain. We also report significant excitation strength to several higher-lying ${2}^{+}$ states in the krypton isotopes. This fragmentation of $B(E2)$ strength in $^{88,90}\mathrm{Kr}$ confirms shell-model calculations in the $\ensuremath{\pi}(fpg)\text{\ensuremath{-}}\ensuremath{\nu}(sdgh)$ shell with an only minimally tuned shell-model setup that is based on a nucleon-nucleon interaction derived from effective field theory and effective charges adjusted to $^{86}\mathrm{Kr}$. |
| Databáze: | OpenAIRE |
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