p壳Λ超核谱学研究进展

Progress in Spectroscopy Study of p-Shell Λ Hypernuclei

Λ超核谱学是研究Λ-N相互作用、探索原子核内部结构和了解Λ粒子的性质在核介质中可能发生的变化的重要工具。利用电磁谱仪和γ谱仪对Λ超核的研究取得了重要成果,揭示出超核能级的一些特征,如:核心激发、Λ粒子在p壳的激发、只在超核中发现的"真正态"等;从实验上确定了壳模型自旋相关的Λ-N相互作用参数;在7ΛLi超核中发现了由于处在0s态的Λ粒子的胶样相互作用引起的超核的收缩现象。然而,实验结果与理论计算之间还存在着某些分歧,需要进一步研究。

Λ hypernuclear spectroscopy is a major tool for investigating the Λ-N interaction, exploring the inner structure of nuclei and finding the possible changes in the property of the Λ particle embedded in nuclear media. Important results have been achieved by means of the electro-magnetic spectrometer and γ-ray spectrometer. Some features of the energy levels of hypernuclei such as the core excitation, the excitation of the Λ particle in a p-shell, the genuine state which can only be found in hypernuclei, etc. have been revealed; the spin dependent shell model parameters of p-shell hypernuclei have been determined experimentally; the shrinkage of ^7 Λ Li caused by the glue-like effect for a Λ sitting in the 0s orbit has been discovered. However some discrepancies between experimental results and theoretical calculations need to be further investigated.