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） ^4_ <bda> h的形成概率来自k ^ - 在光核目标上的静止吸收 ^<16> o， ^12> ying反对对称性核动力学与多步二进制统计衰减相结合。（2）形成使用精制的显微镜转运模型研究了在 ^<12> C上静止时从XI ^吸收中的单，双和双肺化的机制，该模型融合了最近开发的量化兰格蛋白处理到反对称分子动力学（AMD-QL）中。2（AMD-QL）。 1）在室内级联模型中研究了PK = 1.65 GEV/C的反应。 @> d1在休息时吸收，sueved lambd a（1405）是kN的界面，并且显示了PI <@d1（]sy。+ - 。[）D1 Spectrum.3（1）显微镜Sigmann calcentrals的更好描述两体sigma t的不稳定状态s = 1/2，由于渠道耦合Sigman电位，状态可以诱导Sigman*Lambdan转换衰变（停止K^+）。提出了一个核 - 智能，以解释Sigma^ - 原子X射线和Sigma-Hypernucle的生产测量。 .4（1）K ^-D原子的X射线屈服是目标密度的函数，以进行实验（2）Sigma-Hypernucle Productions（K ^ - ，PI）反应。在DWIA框架中，在理论上进行了污染。通过使用复杂的缩放方法

项目成果

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.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: "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。

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》。

Y.Nara: "Target mass dependence of ^4_∧H formation mechanism from K^- absorption at rest" Physics Letters 誌. B346. 217-222 (1995)

Y.Nara：“静止时 K^- 吸收的 ^4_∧H 形成机制的目标质量依赖性”《物理快报》217-222 (1995)。