Regular Article - Theoretical Physics
Effects of many-body interactions in hypernuclei with Korea-IBS-Daegu-SKKU functionals
Center for Exotic Nuclear Studies, Institute for Basic Science (IBS), 34126, Daejeon, South Korea
2 Department of Physics, Tohoku University, 980-8578, Sendai, Japan
3 Department of Physics Education, Daegu University, 38453, Gyeongsan, South Korea
4 Department of Physics and OMEG Institute, Soongsil University, 06978, Seoul, South Korea
Accepted: 16 August 2022
Published online: 31 August 2022
We investigate the properties of hyperon in -hypernuclei using an effective nuclear density functional theory which is based on the low-energy effective field theory. It expands the energy density in the power of Fermi momentum, and consequently has multiple density dependence for the effective many-body interactions. Starting from the effective density functional for nucleons, we determine the parameters for the two- and many-body -N interactions added to the nucleon energy density functional by fitting to -hypernuclear data. The experimental data consist of the energy levels of a hyperon in the p-, and d-states as well as s-state of -hypernuclei in the mass range from to . The results turn out to properly explain the data relevant to hypernuclei owing to the effective many-body interaction apart from a few data in light hypernuclei. This hyperon functional is applied to study the hyperon binding energy of the neutron-rich isotopes which are under consideration for the measurement at J-PARC. Our results are shown to be insensitive to the density dependence of symmetry energy. We also examine the nuclear matter including hyperon. We note that the hyperon threshold density depends on the nuclear matter properties.
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