Σ-admixture in neutron-rich Li Λ hypernuclei in a microscopic shell-model calculation
Nishina Center for Accelerator-Based Science,
2 Research Center for Physics and Mathematics, Osaka Electro-Communication University, Neyagawa, Osaka, 572-8530, Japan
a e-mail: email@example.com
We systematically investigate the structures of the Λ hypernuclei ΛLi with the mass number A = 7–10 in shell-model calculations considering the ΛN -ΣN coupling in the ﬁrst-order perturbation method. We ﬁnd that the calculated Σ-mixing probabilities and energy shifts due to the ΛN -ΣN coupling increase with the neutron number. The Fermi-type and Gamow-Teller-type couplings, which are related to the β-transition properties of the nuclear core state, coherently contribute to the energy shift in neutron-rich hypernuclei.
© Owned by the authors, published by EDP Sciences, 2010