Grant-in-Aid for Scientific Research (C)
|Allocation Type||Single-year Grants|
|Research Institution||Sapporo Gakuin University(1996-1997)|
HARADA Toru(1996-1997) Sapporo Gakuin University, Department of Social information, Assisted Professor, 社会情報学部, 助教授 (70238187)
大西 明(1995) 北海道大学, 大学院・理学研究科, 講師 (70250412)
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)
原田 融 札幌学院大学, 社会情報学部, 助教授 (70238187)
|Project Period (FY)
1995 – 1997
Completed(Fiscal Year 1997)
|Budget Amount *help
¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1997 : ¥300,000 (Direct Cost : ¥300,000)
Fiscal Year 1996 : ¥400,000 (Direct Cost : ¥400,000)
Fiscal Year 1995 : ¥1,300,000 (Direct Cost : ¥1,300,000)
|Keywords||Nuclear Physics / Strangeness / Computer Simulation / Hypernuclei / Few-body System / Microscopic Transport Theory / Nuclear Fragmentation / Response Function / 多重ストレンジネス / 核破片 / シミュレーション / 束縛状態 / 相対論的平均場 / 核物質 / 破砕核 / 共鳴バリオン / 破砕反応 / 多段階過程 / ダブル・ハイパー核 / クラスター相関 / チヤンネル結合|
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
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