In-medium nuclear interactions of low-energy hadrons

We present sets of equation of state (EOS) of nuclear matter including hyperons using an SUf(3) extended relativistic mean field (RMF) model with a wide coverage of density, temperature and charge fraction for numerical simulations of core-collapse supernovae. Coupling constants of ? and ? hyperons with the ? meson are determined to fit the hyperon potential depths in nuclear matter, U?(?0) +30 MeV and U?(?0) ?15 MeV, which are suggested from recent analyses of hyperon production reactions. At low densities, the EOS of uniform matter is connected with the EOS by Shen et al, in which the formation of finite nuclei is included in the Thomas?Fermi approximation. In the present EOS, the maximum mass of neutron stars decreases from 2.17 M? (Ne?) to 1.63 M? (NYe?) when hyperons are included. In a spherical, adiabatic collapse of a 15 M? star by the hydrodynamics without neutrino transfer, hyperon effects are found to be small, since the temperature and density do not reach the region of hyperon mixture, where the hyperon fraction is above 1 % (T > 40 MeV or ?B > 0.4 fm?3).

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Tables of Hyperonic Matter Equation of State for Core-Collapse Supernovae

The first evidence of a deeply bound state of Xi−–14N system K. Nakazawa1,∗, Y. Endo1, S. Fukunaga2, K. Hoshino1, S. H. Hwang3, K. Imai3, H. Ito1, K. Itonaga1, T. Kanda1, M. Kawasaki1, J. H. Kim4, S. Kinbara1, H. Kobayashi1, A. Mishina1, S. Ogawa2, H. Shibuya2, T. Sugimura1, M. K. Soe1, H. Takahashi5, T. Takahashi5, K. T. Tint1, K. Umehara1, C. S. Yoon4, and J. Yoshida1 1Physics Department, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan 2Department of Physics, Toho University, Funabashi 274-8510, Japan 3Advanced Science Research Center, JAEA, Tokai 319-1195, Japan 4Department of Physics, Gyeongsang National University, Jinju 660-701, Korea 5Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801, Japan ∗E-mail: nakazawa@gifu-u.ac.jp

Y.B. Sim

Papers

Production of a twin single hypernuclei and the Ξ - -nuclear interaction

Quasifree p(K−, K+)Ξ− reaction in nuclear emulsion