Coherent lambda-sigma coupling in s-shell hypernuclei
Coherent lambda-sigma coupling in s-shell hypernuclei
复制标题
s 壳超核中的相干 lambda-sigma 耦合
DOI：
10.1103/physrevlett.84.3539
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发表时间：
2000
影响因子：
8.6
通讯作者：
K. Myint
中科院分区：
文献类型：
--
作者：
Y. Akaishi;T. Harada;S. Shinmura;K. Myint
结果发现，二体LambdaN-Sigman耦合的抑制解决了(5)(Lambda)He的过结合问题，但它反过来又导致了四体系统的严重欠结合。通过显式引入Lambda-Sigma耦合，克服了这种束缚的不足，该耦合等价于LambdaNN三体力。根据相干增加的增强，在(4)(Lambda)H和(4)(Lambda)He的0(+)态下，这种三体力变得很强。在(4)(Lambda)H和(4)(Lambda)He中的0(+)-1(+)分裂部分是由于LambdaN自旋-自旋相互作用，部分是由于最近的Nijmegen软核势中的Lambda-Sigma耦合。
It is found that the suppression due to two-body LambdaN-SigmaN coupling solves the overbinding problem in (5)(Lambda)He but it, in turn, causes a severe underbinding in the four-body systems. The shortage of this binding is overcome by introducing explicitly the Lambda-Sigma coupling which is equivalent to the LambdaNN three-body force. This three-body force becomes strong in the 0(+) states of (4)(Lambda)H and (4)(Lambda)He according to the coherently added enhancement. The 0(+)-1(+) splitting in (4)(Lambda)H and (4)(Lambda)He is found partly due to the LambdaN spin-spin interaction and partly due to the Lambda-Sigma coupling in the recent Nijmegen soft-core potential.