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

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）<BDA><16><12>利用反对称核动力学结合多步二进制统计衰变研究了轻核靶^ O、^ C到^9 Be的静态K^-吸收生成^4_ H的几率。(2)利用精细的微观输运模型研究了XI^-在^ C上静止吸收形成单、双和双超核的机制<12>，该模型将最近发展的量子Langein处理结合到反对称化分子动力学（AMD-QL）中。2（1）在具有重要两步过程的核内级联模型中研究了pk=1.65 GeV/c的（K^-，K^+）反应的动量谱，该模型可以再现各种靶的实验数据。(2)对K&lt;@D1-@&gt;D1静态吸收分支比的介质内修正表明，LAMBDA（1405）是KN的束缚态，并对pi&lt;@D1（]SY. ±-. [）@&gt;D1光谱。3（1）使用中心两体SIGMA的微观SIGMANN计算 ...更多信息 N相互作用表明存在S=1/2，T=1的不稳定束缚态，这是由于SIGMAN势的通道耦合。该状态可以在^4 He（停止的K^-，pi^+）反应中诱导SIGMAN*LAMBDAN转换衰变。(2)提出了一个核-SIGMA势来解释SIGMA^-原子X射线和SIGMA-超核产生测量。对^9Be（飞行中的K^-，pi^-）反应的计算表明，光谱形状来自^9_MABe中α +^4_MAHe（^4_MAH）+n（p）的团簇行为。4（1）为了找到实验的最佳条件，计算了K^--p和K^--d原子的X射线产额与靶密度的函数关系。(2)在DWIA框架下，我们对^4He靶上的飞行中（K^-，pi）反应产生SIGMA超核进行了理论研究。结果表明，飞行反应提供了^4_MAHe不稳定束缚态的宽度和结构的确定信息，强度函数可以表示为束缚项、共振项和连续项的贡献之和，并且可以用复标度法互补地研究每一项的作用.少

项目成果

Y.Nara: "Target mass dependence of ^4_ΛH formaition mechanism from K^- absorption at rest" Physics Letters B. 346. 217-222 (1995)

Y.Nara：“来自 K^- 静止吸收的 ^4_ΛH 形成机制的目标质量依赖性”《物理快报》B. 346. 217-222 (1995)

T.Harada: "Strangeness exchange reactions on a helium target" Nuclear Physics A. (印刷中). (1998)

T.Harada：“氦靶上的奇异性交换反应”核物理 A.（出版中）（1998 年）。

Y.H.Koike: "SIGMA-continuum spectrum in the ^4He (stopped K^-, pi^+) reaction. Contribution of the SIGMAN*LAMBDAN conversion decay" Physics Letters. B342. 19-24 (1995)

Y.H.Koike：“^4He（停止 K^-，pi^）反应中的 SIGMA 连续谱。SIGMAN*LAMBDAN 转换衰变的贡献”《物理快报》。

T.Harada: "Light SIGMA-Hypernuclei by in-flight K^- beam" Proc. of the 23rd INS International Symposium on Nuclear and Particle Physics with Meson Beams in the 1 GeV/c Region, Tokyo, Japan, 15-18 March, 1995, (Universal Academy press, Inc., Tokyo, Japan,

T.Harada：“通过飞行中 K^- 光束照射 SIGMA-Hypernuclei”Proc。

T.Koike: "Cascade Calculation of K^--p and K^--d Atoms" Proc.of the 23rd INS International Symposium on Nuclear and Particle Physics with Meson Beams in the 1 GeV/c Region, Tokyo, Japan, Mar. 15-18, 1995, (Universal Academy press, Inc., Tokyo, Japan, 1995

T.Koike：“Cascade Calculation of K^--p and K^--d Atoms”Proc.of the 23rd INS International Symposium with Meson Beams in the 1 GeV/c Region，日本东京，3 月