Nuclear (K)over-bar bound states in light nuclei -: art. no. 044005
Nuclear (K)over-bar bound states in light nuclei -: art. no. 044005
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DOI：
10.1103/physrevc.65.044005
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发表时间：
2002-04-01
影响因子：
3.1
通讯作者：
Yamazaki, T
中科院分区：
文献类型：
--
作者：
Akaishi, Y;Yamazaki, T
从理论上研究了少体系统中深束缚核（K）态的存在性。在He-3，He-4和Be-8中的K-的核基态被预测为离散态，结合能分别为108，86和113 MeV，宽度分别为20，34和38 MeV。宽度的小源于它们的能级位置低于Sigmapi发射阈值。结果表明，由于I=0（K）对barN的强吸引，导致周围核的大幅度收缩，从而形成异常致密的核介质。提出了He-4（停止K-，n）反应中T=0 K（-）x（3）He+（K）在bar（0）x（3）H态上的形成，计算的分支比约为2%.
The possible existence of deeply bound nuclear (K) over bar states is investigated theoretically for few-body systems. The nuclear ground states of a K- in He-3, He-4, and Be-8 are predicted to be discrete states with binding energies of 108, 86, and 113 MeV and widths of 20, 34, and 38 MeV, respectively. The smallness of the widths arises from their energy-level locations below the Sigmapi emission threshold. It is found that a substantial contraction of the surrounding nucleus is induced due to the strong attraction of the I=0 (K) over barN pair, thus forming an unusually dense nuclear medium. Formation of the T=0 K(-)x(3)He+(K) over bar (0)x(3)H state in the He-4 (stopped K-, n) reaction is proposed, with a calculated branching ratio of about 2%.