Gamma-widths, lifetimes and fluctuations in the nuclear quasi-continuum

M. Guttormsen, A. Larsen, J. E. Midtbø, L. C. Campo, A. Görgen, V. W. Ingeberg, T. Renstrøm, S. Siem, G. Tveten, F. Zeiser, L. Kirsch
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Abstract

Statistical $\gamma$-decay from highly excited states is determined by the nuclear level density (NLD) and the $\gamma$-ray strength function ($\gamma$SF). These average quantities have been measured for several nuclei using the Oslo method. For the first time, we exploit the NLD and $\gamma$SF to evaluate the $\gamma$-width in the energy region below the neutron binding energy, often called the quasi-continuum region. The lifetimes of states in the quasi-continuum are important benchmarks for a theoretical description of nuclear structure and dynamics at high temperature. The lifetimes may also have impact on reaction rates for the rapid neutron-capture process, now demonstrated to take place in neutron star mergers.
核准连续体的伽马宽度,寿命和波动
高激发态的统计衰减由核能级密度(NLD)和射线强度函数($\gamma$SF)决定。这些平均量已经用奥斯陆方法测量了几个原子核。我们首次利用NLD和$\gamma$SF来计算中子结合能以下的能量区域(通常称为准连续区)的$\gamma$-宽度。准连续介质中状态的寿命是高温下核结构和动力学理论描述的重要基准。寿命也可能对快速中子捕获过程的反应速率产生影响,现在已经证明发生在中子星合并中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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