Three- and four-body study of light hypernuclei and YN interaction

轻超核和 YN 相互作用的三体和四体研究

• 批准号: 11640283
• 负责人: KAMIMURA Masayasu
• 金额: $ 1.66万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640283/
• 关键词: hypemuclei; hypenon; strangeness; 3-body problem; 4-body problem; Λ particle; ハイペロン-核子相互作用; スピン軌道力; ガンマー線分光; 3体・4体問題; ガウス型基底関数

[1] Theoretical prediction of B(E2) in hypemuclei.We calculated B(E2: 5/2^+_1 → 1/^+_1) in ^7_λLi and B(E2: 3^+_1→1^+_1) of the core nucleus ^6_λLi. From their comparison, we predicted that size of ^7_λLi is shrunk by 21% from the core nucleus. KEK-E419 experiment verified this prediction.[2] YN spin-orbit force and the level structure of ^9_λBe and ^13_λ3C.With the use of the two kinds of YN interactions we calculated energy splitting in the spin orbit doublet in ^9_λBe and ^13_λ3C. The quark-model-based interaction gave very small splitting, where as the meson-theory- based interaction gave substantially large splitting. Experiments at BNL reported a small splitting which agrees with the former case of our prediction.[3] Four-body study of ^4_λH and ^4_λHe.We performed, for the first time, four-body calculation of ^4_λH and ^4_λHe with the explicit use of the (3Ν+Λ) and (3Ν+Σ) channel. The ΛΝ-Σ coupling is treated accurately. We were able to explain the level structure of the hypemuclei and estimated the probability of the (3Ν+Σ) channel. It is 2% in the 0^+ state and 1% in the 1^+ state, but plays important role in making the states bound.[4] Spectroscopy of the double-Λ hypemuclei.We predicted the energy levels of the A=7-10 double-Λ hypemuclei with the use of the α+χ+Λ+Λ four-body model with χ= n,p,t,^3He,α. Our prediction for 2^+ state of ^<10>_<ΛΛ>Be was recently verified by the DEMACHI-YANAGI event in the KEK-E373 experiment.

[1] Hypemuclei中B（E2）的理论预测。我们计算了B（E2：5/2^+_ 1→1/^+_ 1）在^7_λli和b（e2：3^+_ 1→1）中核心 ^6_λli的比较，我们预测了 ^7_λli的大小从核心核中缩小了21％。在 ^9_λbe3c中的自旋轨道中，基于Quark模型的相互作用非常小，因为基于中间理论的相互作用在BNL上提供了实验。 ^4_λH和 ^4_λHE的四体研究，我们首次对（3ν+σ）通道进行了 ^4_λHE的四体计算Hypemuclei的结构和估计（3ν+σ）的概率在0^+状态下为2％，但在使状态结合的情况下起着重要作用。 a = 7-10 Hypemucle，使用= n，t，α，α，α的α+λ+λ模型的使用。在KEK-E373实验中，通过Demachi-Yanagi事件进行了验证。

项目成果

E.Hiyama: "Three-and Four-Body Structure of Light Hypernuclei"Nuclear Physics. A691. 107-107 (2001)

E.Hiyama：《轻超核的三体和四体结构》核物理。

E.Hiyama: "Three-and four-body structure of light hypernuclei"Nuclear Physics A. 684(1). 227c-232c (2001)

E.Hiyama：“轻超核的三体和四体结构”核物理A.684(1)。

E. Hiyama, M. Kamimura, T. Motoba, T. Yamada and Y. Yamamoto: "Three- and Four-Body Structure of Light Hypernuclei"Nuclear Physics. A691. 107c (2001)

E. Hiyama、M. Kamimura、T. Motoba、T. Yamada 和 Y. Yamamoto：“轻超核的三体和四体结构”核物理。

E.Hiyama: "Three-and four-body structure of light Λ hypernuclei"Nuclear Physics A. 691(1). 107c-110c (2001)

E. Hiyama：“光Λ超核的三体和四体结构”核物理A. 107c-110c (2001)。

E.Hiyama: "Λ-Σ conversion in ^4_ΛH and ^4_ΛHe based on four-body"Physical Review C. 64(1). 11301-1-11301-5 (2002)

E. Hiyama：“基于四体的 ^4_ΛH 和 ^4_ΛHe 中的 Λ-Σ 转换”《物理评论》C. 64(1) (2002)。