Disappearance of nuclear deformation in hypernuclei: a perspective from a beyond-mean-field study
| Autor: | H. Mei, T. Motoba, Kouichi Hagino, Jiangming Yao |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear Theory 010308 nuclear & particles physics FOS: Physical sciences Impurity effect Deformation (meteorology) Lambda 01 natural sciences Nuclear Theory (nucl-th) Mean field theory 0103 physical sciences Oblate spheroid Density functional theory Covariant transformation Nuclear Experiment (nucl-ex) 010306 general physics Nuclear Experiment Mathematical physics |
| DOI: | 10.48550/arxiv.1804.06558 |
| Popis: | The previous mean-field calculation [Myaing Thi Win and K. Hagino, Phys. Rev. C{\bf 78}, 054311 (2008)] has shown that the oblate deformation in $^{28,30,32}$Si disappears when a $\Lambda$ particle is added to these nuclei. We here investigate this phenomenon by taking into account the effects beyond the mean-field approximation. To this end, we employ the microscopic particle-rotor model based on the covariant density functional theory. We show that the deformation of $^{30}$Si does not completely disappear, even though it is somewhat reduced, after a $\Lambda$ particle is added if the beyond-mean-field effect is taken into account. We also discuss the impurity effect of $\Lambda$ particle on the electric quadrupole transition, and show that an addition of a $\Lambda$ particle leads to a reduction in the $B(E2)$ value, as a consequence of the reduction in the deformation parameter. Comment: 6 pages, 5 figures. The version to appear in Phys. Rev. C |
| Databáze: | OpenAIRE |
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