| Co-Investigator(Kenkyū-buntansha) |
KATO Kiyoshi Hokkaido University, Graduate School of Science, Assisted Professor, 大学院・理学研究科, 助教授 (20109416)
OHNISHI Akira Hokkaido University, Graduate School of Science, Lecturer, 大学院・理学研究科, 講師 (70250412)
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| Research Abstract |
1 (1) Formation probabilities of ^4_<BDA>H from K^- absorption at rest on light nuclear targets ^<16>O,^<12>C to ^9Be, were investigated employing antisymmetrized nuclear dynamics combined with multi-step binary statistical decay.
(2) Formation mechanisms of single, twin and double hypernuclei from XI^- absorption at rest on ^<12>C were investigated with a refined microscopic transport model, that incorporates the recently developed Quantal Langein treatment into Antisymmetrized Molecular Dynamics (AMD-QL).
2 (1) Momentum spectrum in the (K^-, K^+) reactions at pk=1.65 GeV/c was investigated in an intranuclear cascade model with the important two-step processes, which can reproduce the experimental data on various targets.
(2) In-medium corrections to the branching ratio in K<@D1-@>D1 absorption at rest, suggested that the LAMBDA (1405) is a bound state of KN,and showed a better description of pi<@D1(]SY.+-。[)@>D1 spectrum.
3 (1) Microscopic SIGMANN calculations with central two-body SIGMA
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N interaction suggested that there exist unstable bound states of S=1/2, T=1 due to the channel coupling through the SIGMAN potential. The state can induce a SIGMAN*LAMBDAN conversion decay in the ^4He (stopped K^-, pi^+) reaction.
(2) A nucleus-SIGMA potential was presented to explain the both SIGMA^- atomic X-ray and SIGMA-hypernuclear production measurements. Calculations in the ^9Be (in-flight K^-, pi^-) reaction suggested that a spectral shape comes from cluster behavior of alpha+^4_MAHe (^4_MAH) +n (p) in ^9_MABe.
4 (1) X-ray yields of K^--p and K^--d atoms were calculated as a function of the target density in order to find an optimum condition for experiments.
(2) SIGMA-hypernuclear productions by in-flight (K^-, pi) reactions on the ^4He target were investigated theoretically in the DWIA framework. The results showed that the in-flight reaction provides definitive information on the width and the structure of ^4_MAHe unstable bound state.
It was shown that the strength function can be expressed in a sum of the contributions form bound, resonance and continuum terms and the role of each term can be investigated complementarily by using the complex scaling method. Less
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