Three- and four-body study of light hypernuclei and YN interaction
| Project/Area Number |
11640283
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
素粒子・核・宇宙線
|
|---|
| Research Institution | KYUSHU UNIVERSITY |
|---|
Principal Investigator |
KAMIMURA Masayasu Kyushu University, Department of Physics, Professor, 理学研究院, 教授 (10037210)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
HIYAMA Emiko High Energy Accelerator Research Organization, Institute of Particle and nuclear Study, Research Assistant, 高エネルギー加速器研究機構・素粒子原子核研究所, 助手 (10311359)
|
|---|
| Project Period (FY) |
1999 – 2001
|
| Project Status |
Completed (Fiscal Year 2001)
|
| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
|
|---|
| Keywords | 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 |
|---|
| Research Abstract |
[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.
|
Report
(4 results)
Research Products
(16 results)
