arXiv 0906.28382009-06-16nucl-ex

共振中子俘获初级γ跃迁强度分布参数及复合核$^{157,159}$ Gd的某些性质

Parameters of Distribution of the Primary Gamma-Transition Intensities Following Resonance Neutron Capture and Some Properties of Compound Nuclei $^{157,159}$Gd

A. M. Sukhovoj, V. A. Khitrov

备注：: 11 pages, 7 figures
发表信息：: Proceedings of the XVI International Seminar on Interaction of Neutrons with Nuclei, June 11-14 2008, Dubna, JINR E3-2009-33, pp. 192-202

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摘要：

对已发表的$^{156,158}$ Gd中不同中子共振群中子俘获后的初级γ跃迁强度的实验数据进行了重新分析。确定了E_1和M_1初级跃迁之和的最可几值，它们激发的宇称能级数，辐射强度函数比k（M_1）/k（E_1），强度随机值与平均值的偏差的分散度，以及J=5/2能级的初级跃迁的平均强度与J=1/2和3/2能级的类似数据的比值（捕获24 keV中子）。能级密度和辐射强度函数之和的所有数据证实了在低于3 MeV的能级密度中存在清楚表达的台阶状结构，以及强度函数随初级γ跃迁能量变化的一般趋势。在改变激发能时，分布色散的变化，特别是比值k（M1）/k（E1）（或$k(E1)/k(M1)$）的变化，表明这些核在1.0-1.5 MeV以上的结构发生了强烈的变化。

英文摘要：

The re-analysis of the published experimental data on the primary gamma-transition intensities following neutron capture in different groups of neutron resonances in $^{156,158}$Gd has been performed. There are determined the most probable values of sum of E1 and M1 primary transitions, numbers of excited by them levels of both parities, ratios of radiative strength functions k(M1)/k(E1), dispersions of deviations of random values of intensities from the average and ratios of mean intensities of primary transitions to levels J=5/2 with respect to analogous data for J=1/2 and 3/2 (capture of the 24 keV neutrons) in narrow excitation energy intervals. All the data on level density and sums of radiative strength functions confirm the presence of clearly expressed step-like structure in level density below 3 MeV and general trend in change in strength functions as changing primary gamma-transition energy. Variations of distribution dispersions and, especially, ratio k(M1)/k(E1) (or $k(E1)/k(M1)$) at changing excitation energy point to strong change in structure of these nuclei above 1.0-1.5 MeV.

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