G-Matrix Approach to Hyperon-Nucleus Systems(Chapter I.,Hypernuclei and Baryon-Baryon Interaction)

概要

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The properties of the new YN・YY interaction model ESC08 are studied on the basis of the G-matrix theory. G-matrix calculations in nuclear matter are performed in the cases of AN-, ΣN-, ΞN- and ΛΛ-starting channels. In the ΛN case, the spin-spin and spin-orbit terms are shown to be of reasonable strengths. The folding-model analyses are done extensively for observed spectra of Λ hypernuclei. The experimental energy spectra are nicely reproduced. The shell-model analyses for typical Λ hypernuclei are performed with the G-matrix interactions. In the ΣN case, the repulsive values of U_Σ are obtained owing to the effect of the quark Pauli-forbidden states which are taken into account phenomenologically in ESC08. In the ΞN case, the moderately attractive values of U_Ξ are obtained mainly due to the strongly attractive contributions in ^3S_1T=1 ΞΣ-ΛΣ-ΣΣ coupled states, which leads to extensive existence of Ξ hypernuclei. In the ΛΛ case, the B_<ΛΛ> values derived from ESC08 are found to be consistent with the experimental values.
2010-11-30