The structure of hypernuclei and hyperon mixing in neutron-star matter

• Published in: Physica scripta Vol. 91; no. 9; pp. 93001 - 93033
• Main Authors: Hiyama, E, Yamamoto, Y, Sagawa, H
• Format: Journal Article
• Language: English
• Published: IOP Publishing 27-07-2016
• Subjects: hypernuclear physics; interaction; neutron star
• ISSN: 0031-8949; 1402-4896
• DOI: 10.1088/0031-8949/91/9/093001

We review our recent studies of the structure of Λ hypernuclei within the framework of the Gaussian expansion method for s- and p-shell hypernuclei and the mean-field approach for sd-shell hypernuclei. Specifically, we focus on the structures of (i) the energy splittings of the 3 / 2 + - 5 / 2 + and 3 / 2 − - 1 / 2 − levels in Λ 9 Be and Λ 13 C within the framework of 2 + Λ and 3 + Λ , three- and four-body cluster models for the hyperon-nucleon (Y-N) spin-orbit force; (ii) the Λ 3 n system for Λ N − N coupling; (iii) the weakly bound states or resonant states of neutron-rich Λ hypernuclei such as Λ 6 H and Λ 7 He within the framework of t + Λ + n + n and + Λ + n + n four-body models; and (iv) the tensor correlation effect and super-deformation structure of Λ hypernuclei based on sd-shell nuclei with mass 20 ≤ A ≤ 40 using the deformed Skyrme-Hartree-Fock model and the antisymmetrized molecular dynamics model. As an extreme limit of nuclei including multiple hyperons, we review hyperon effects in neutron-star matter in the high-density region using recent Y-N interactions.