Microscopic simulation for strangeness nuclear physics

Recent theoretical progress in the study of the strangeness nuclear reactions by applying microscopic transport models are presented. Microscopic transport models used in this work incorporate phase space dynamics, stochastic two-body collisions, particle productions and their decays with Pauli-blocking, therefore we can expect wide applicability from low- to high energy reactions. First, formation probabilities of Λ4H from K-absorption at rest on light nuclear targets are investigated employing antisymmetrized molecular dynamics(AMD) combined with multi-step binary statistical decay. Calculated results show that as the target mass number decreases from 16O, 12C to 9Be, the main formation mechanism varies from statistical decay, followed by dynamical fragmentation, to direct formation in nuclear environment. Negative pion spectrum is also calculated within the quantum molecular dynamics model(QMD) including the delta degrees of freedom. Next, We study momentum spectrum in the reaction of (K-,K+) at a beam momentum of 1.65 GeV/c. In the framework of intra nuclear cascade (INC) type calculation, we found that, in the low-momentum region of K+ particle, the forward-angle cross sections of (K-,K+) reaction on various targets are consistently explained by taking into account both of two-step processes and φ,a0 and f0 productions and their decay into K+K-. (author)