Theoretical Analyses of Production and Weak Decay of Hypernuclei with Strangeness=-2

奇异值=-2的超核产生和弱衰变的理论分析

• 批准号: 07640424
• 负责人: MOTOBA Toshio
• 金额: $ 1.47万
• 依托单位: OSAKA ELECTRO-COMMUNICATION UNIVERSITY
• 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-07640424/
• 关键词: Hypernucleus; Hyperon-nucleon interaction; Pionic weak decay; Nonmesonic weak decay; strangeness halo; Hypernuclear lifetime; ダブルハイパー核; ストレンジネス・ハロ-; ハイペロン核子相互作用; ストレンジネス; 核力; 弱相互作用; 弱崩壊

Starting with the (K^-, K^+) reaction on nuclear targets of mass number 9-12, the probabilities of producing double-LAMBDA and single-LAMBDA hyperfragments at the reaction points have been evaluated on the basis of the statistical model. First, the XI particle produced abundantly in the quasi-free region is shown to be well absorbed into the nucleus through the XI slowdown by knocking out a nucleon. Then the formation of a double-lambda compaound nuclear system is assumed together with its subsequent breaking-up into various hyperfragments. Theoretical pion spectra are presented for the weak decays of the double-lambda and single-LAMBDA hypernuclei produced efficiently in this scinario, which can be utilized for the identification of their hyperfragments production. it is proposed that the observation of <LAMBDALAMBDA>^^^ He with the ^9Be target is most feasible and promising. Mesonic decay spectra for the other p-shell double-LAMBDA hypernuclei have been systematically calculated.

从质量数为9-12的核靶上的（K^-，K^+）反应出发，根据统计模型计算了在反应点产生双LAMBDA超碎片和单LAMBDA超碎片的概率。首先，在准自由区大量产生的XI粒子被证明是很好地吸收到核中通过XI减速敲出一个核子。然后，一个双λ化合物核系统的形成被假定连同其随后的分裂成各种超碎片。给出了在该实验室中有效产生的双λ超核和单λ超核的弱衰变的理论π介子能谱，可用于鉴别它们的超碎片产生。提出<LAMBDALAMBDA>用^9Be靶观测^^^ He是最可行和最有希望的。系统地计算了其它p壳层双LAMBDA超核的介子衰变谱。

项目成果

T.Motoba: "Mesonic Weak decays of Strange Nuclear Systems" Weak and Electromagnetic Interactions in Nuclei (World Sci). 504-513 (1995)

T.Motoba：“奇异核系统的介音弱衰变”原子核中的弱相互作用和电磁相互作用（世界科学）。

T.Motoba: "Pionic Weak Decays of Double-∧ Hypernuclei Produced at (K^-,K^+) Reaction Points" Advances in Nuclear Physics and Related Areas. in press (1997)

T.Motoba：“在（K^-，K^+）反应点产生的双∧超核的π弱衰变”核物理及相关领域的进展已出版（1997）。

T.Motoba: "Mesonic weak decays of Strange Nuclear Systems" Weak and Electromagnetic Interactions in Nuclei (World Sci). 506-513 (1995)

T.Motoba：“奇怪核系统的介音弱衰变”原子核中的弱相互作用和电磁相互作用（世界科学）。

K.Itonaga et al: "Pionic decay of a possible d'dibaryon" Nuclear Physics. A609. 422-436 (1996)

K.Itonaga 等人：“可能的 ddibaryon 的π介子衰变”核物理。

E.Hiyama et al.: "Three- and Four-body Models of A=6-7 Hypernuclei : Halo and skin structures" Physical Review. C 53. 2075-2085 (1996)

E.Hiyama 等人：“A=6-7 超核的三体和四体模型：光环和皮肤结构”物理评论。