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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >THE GAMOW-TELLER DECAY OF SN-105 TO THREE-PARTICLE STATES IN IN-105
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THE GAMOW-TELLER DECAY OF SN-105 TO THREE-PARTICLE STATES IN IN-105

机译：SN-105的GAMOW-TELLER衰减至IN-105中的三粒子状态

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The EC/beta(+) decay of Sn-105 was reinvestigated by using Ni-58(5 MeV/u) +Cr-50 reactions, chemically selective on-line mass separation and gamma-ray spectroscopy. The half-life of Sn-105 has been determined as 34 +/- 1 s. Out of 104 gamma transitions ascribed to the Sn-105 decay, 89 have been placed in the decay scheme including 52 excited states of In-105. From the EC/beta(+) feeding of individual states, the distribution of the Gamow-Teller (GT) strength has been derived. It is shown that the main part of the GT strength is associated with the feeding of In-105 levels having excitation energies above 3 MeV. This observation can be interpreted as a sign of dominant feeding of three-quasiparticle states in In-105, which correspond to the pi(g(9/2))(-1)nu g(7/2)nu d(5/2) shell-model configuration spread over many levels. The sum of the GT strength deduced from the present gamma-ray data of B-Sigma(GT) = 1.46 provides a lower limit to the total GT strength. Many weak transitions, mainly from high-energy levels, may not have been detected in this study and therefore part of the strength may be missed. An indirect support for this conclusion has been obtained from the analysis of the indium KX-rays intensity. This analysis indicates about 50% contribution of the electron-capture to the beta decay of Sn-105, which is interpreted as a sign of a predominant feeding of the high-energy In-105 states with B-Sigma(GT) greater than or equal to 3. The observed GT distribution and strength will be compared to results obtained from a finite-Fermi-system theory and a large-basis shell-model calculation. The core-polarization and higher-order hindrance factors will be discussed. [References: 29]
机译：通过使用Ni-58（5 MeV / u）+ Cr-50反应，化学选择性在线质量分离和伽马射线光谱对Sn-105的EC /β（+）衰减进行了重新研究。 Sn-105的半衰期已确定为34 +/- 1 s。在归因于Sn-105衰变的104个伽玛跃迁中，有89个处于包括52个In-105激发态的衰变方案中。从单个状态的EC / beta（+）馈入，得出了Gamow-Teller（GT）强度的分布。结果表明，GT强度的主要部分与激发能量高于3 MeV的In-105能级的供给有关。该观察结果可以解释为In-105中三个准粒子状态占主导地位的迹象，这对应于pi（g（9/2））（-1）nu g（7/2）nu d（5 / 2）壳模型配置分布在多个级别。从当前的B-Sigma（GT）的伽马射线数据得出的GT强度总和= 1.46，为总GT强度提供了一个下限。在此研究中可能未检测到许多主要来自高能水平的弱过渡，因此可能会忽略部分强度。通过对铟KX射线强度的分析获得了对该结论的间接支持。该分析表明，电子捕获对Sn-105的β衰变的贡献约为50％，这被解释为B-Sigma（GT）大于或等于B的高能In-105态占主导地位的迹象。等于3。将观察到的GT分布和强度与从有限费米系统理论和大型基础壳模型计算获得的结果进行比较。将讨论核心极化和高阶阻碍因素。 [参考：29]

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