Study of Matter Properties and Fragmentation Behavior from Highly Excited States in Multi-strange Nuclear Systems.

多奇异核系统中高激发态的物质性质和破碎行为研究。

• 批准号: 07640365
• 负责人: HARADA Toru
• 金额: $ 1.28万
• 依托单位: Sapporo Gakuin University (1996-1997)Hokkaido University (1995)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640365/
• 关键词: 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; ; 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

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 … More 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

1（1）研究了 ^4_ <bda> h的形成可能性的可能性，在光核目标上静止 ^<16> o， ^<12> c至 ^9be，采用了反对称动力学，结合了多步骤二进制统计衰减。 microscopic transport model, that incorporates the recently developed Quantal Langein treatment into Antisymmetric Molecular Dynamics (AMD-QL).2 (1) Momentum spectrum in the (K^-, K^+) reactions at pk=1.65 GeV/c was investigated in an intransclear cascade model with the important two-step processes, which can reproduce the experimental data on various targets.(2) In-medium corrections to the k <@d1-@> d1的分支比率在休息处受苦，建议lambda（1405）是kN的界面状态，并且显示了PI <@d1（] sy。+ - 。[）@。频道通过Sigman潜力耦合。该状态可以在^4He（停止K^ - ，pi^+）反应中诱导Sigman*lambdan转换衰减。（2）提出了核 - sigma电位，以解释Sigma^ - 原子X射线和Sigma-Hyypernclear生产测量。 ^9BE中的计算（在飞行中k^ - ，pi^ - ）反应表明，光谱形状来自alpha +^4_mahe（^4_mah） +n（^4_mah） +n（p）^9_mabe.4（1）X射线的X射线单值的群集行为。在DWIA框架中研究了 ^4HE目标对 ^4HE靶标的飞行内（K ^ - ，PI）反应的Sigma-Hyperncolear生产。结果表明，飞行中的反应提供了有关 ^4_mahe不稳定结合状态的宽度和结构的明确信息。这表明强度函数可以用构成形式的构成，共振和连续项的总和表示，并且可以通过使用复杂的尺度方法来完成每个项的作用。较少的