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首页> 外文期刊>Physical review, C >Statistical-model description of gamma decay from compound-nucleus resonances
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Statistical-model description of gamma decay from compound-nucleus resonances

机译：复合核谐振γ腐蚀的统计模型描述

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The statistical model of compound-nucleus reactions predicts that the fluctuations of the partial gamma-decay widths for a compound-nucleus resonance are governed by the Porter-Thomas distribution (PTD), and that consequently the distribution of total gamma-decay widths is very narrow. However, a recent experiment [Koehler, Larsen, Guttormsen, Siem, and Guber, Phys. Rev. C 88, 041305(R) (2013)] reported large fluctuations of the total gamma-decay widths in the Mo-95(n, gamma)Mo-96* reaction, contrary to this expectation. Furthermore, in recent theoretical works it was argued that sufficiently strong channel couplings can cause deviations of the partial width distributions from PTD. Here, we investigate whether the combined influence of a large number of nonequivalent gamma-decay channels, each of which couples weakly to the compound-nucleus resonances, can modify the statistics of the partial widths. We study this effect in neutron scattering off Mo-95 within a random-matrix model that includes coupling to the entrance neutron channel and to the large number of gamma channels. Using realistic coupling parameters obtained from empirical models for the level density and the gamma strength function, we find that the PTD describes well the distribution of partial widths for all decay channels, in agreement with the statistical-model expectation. Furthermore, we find that the width of the distribution of the total gamma-decay widths is insensitive to wide variations in the parameters of the gamma strength function, as well as to deviations of the partial-width distributions from the PTD. Our results rule out an explanation of the recent experimental data within a statistical-model description of the compound nucleus.
机译：复合核反应的统计模型预测，复合核谐振的部分伽马衰减宽度的波动由Porter-Thomas分布（PTD）管辖，因此因此，总伽马衰减宽度的分布非常狭窄的。然而，最近的实验[Koehler，Larsen，Guttormsen，Siem和Phy，Phy。 Rev. C 88,041305（R）（2013）]报道了MO-95（N，GAMMA）MO-96 *反应中的总γ衰减宽度的大波动，与此期望相反。此外，在最近的理论上，认为，有足够强的通道联轴器可以导致部分宽度分布从PTD导致偏差。在这里，我们研究了大量非等离伽马衰减通道的组合影响是否跨越复合核共振耦合，可以改变部分宽度的统计数据。我们在随机矩阵模型内研究中子散射OFF MO-95的这种效果，包括耦合到入口中子通道和大量伽马通道。使用从实际模型获得的实际耦合参数，用于电平密度和伽马强度功能，我们发现PTD符合所有衰减通道的部分宽度分布，同时与统计模型期望。此外，我们发现总伽马衰减宽度的分布的宽度对伽马强度功能参数的宽变化不敏感，以及从PTD的部分宽度分布的偏差。我们的结果排除了近期实验数据在复合核的统计模型描述中的解释。

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