arXiv 0908.41432009-08-28nucl-th

（$K^-$，$π^+$）反应中库仑辅助的$\bmΣ^-$ -核结合态

Coulomb-assisted $\bmΣ^-$-nucleus bound states in the ($K^-$, $π^+$) reaction

Toru Harada, Yoshiharu Hirabayashi

发表信息：: Nucl.Phys.A829:100-125,2009
DOI：: 10.1016/j.nuclphysa.2009.08.005

摘要：

我们研究了在扭曲波脉冲近似下库仑辅助的$Σ^-$ -核束缚态的核反应（$K^-$，$π^+$）的产生，从而考察了几种与现有的$Σ^-$原子X射线数据和核反应（$π^-$，$K^+$）数据相一致的$Σ$ -核势.我们从理论上证明了在入射$K^-$实验室动量$p_{K}= 400\text{--}800$ MeV/c下，$Σ^-$不稳定束缚态在$^{28}$ Si、$^{58}$ Ni和$^{208}$ Pb靶上的包容性（$K^-$，$π^+$）谱。结果表明，在$^{58}$ Ni靶上的近无反冲（$K^-$，$π^+$）反应提供了一个明确的候选者来确认$Σ$ -核势的性质，该核势具有核表面内的排斥和核外的吸引以及相当大的吸收，而核中心处的势的排斥的细节不能由包含谱确定.这是一个很有前途的尝试，以提取性能的$Σ$ -在即将到来的J-PARC实验中的核电位，作为一个完整的补充，分析的$Σ^-$原子和（$π^-$，$K^+$）的数据。

英文摘要：

We study a production of Coulomb-assisted $Σ^-$-nucleus bound states by nuclear ($K^-$, $π^+$) reactions within a distorted-wave impulse approximation, so as to examine several types of the $Σ$-nucleus potentials that are consistent with the available $Σ^-$ atomic X-ray data and nuclear ($π^-$, $K^+$) data. We theoretically demonstrate the inclusive ($K^-$, $π^+$) spectra of the $Σ^-$ unstable bound states on $^{28}$Si, $^{58}$Ni, and $^{208}$Pb targets at incident $K^-$ lab momenta $p_{K}= 400\text{--}800$ MeV/c. The results show that the near-recoilless ($K^-$, $π^+$) reaction on the $^{58}$Ni target gives a clear candidate to confirm properties of the $Σ$-nucleus potentials having a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption, whereas details of the repulsion of the potential at the nuclear center cannot be determined by the inclusive spectra. This is a promising attempt to extract properties of the $Σ$-nucleus potential in the nucleus at forthcoming J-PARC experiments, as a full complement to the analyses of the $Σ^-$ atomic and ($π^-$, $K^+$) data.

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