发表机构
University of Tennessee, Knoxville; Los Alamos National Laboratory（田纳西大学诺克斯维尔分校; 洛斯阿拉莫斯国家实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出一个双组分激子模型，在复合核平衡前允许中子发射，补充Hauser-Feshbach模型，并在BeoH代码中实现，发现预平衡发射使N=126区P_{xn}值改变达5-10%。
AI 中文摘要
本文提出了一种用于β延迟中子发射的模型，在该模型中，允许在β⁻衰变所布居的态在所谓的“复合核”图像中达到平衡之前发生中子发射。预平衡中子谱采用双组分激子模型计算，其中中子与质子、粒子与空穴的自由度被独立处理。该模型已在BeoH代码中实现，以补充现有的用于复合核态统计衰变的Hauser-Feshbach模型。针对β衰变前体核，在区域47≤Z≤49, 83≤N≤86和54≤Z≤58, N=125,126中，研究了总中子谱中预平衡成分对单中子及多中子发射概率P_{xn}的影响。与仅由Hauser-Feshbach模型预测的值相比，在N=126区域，当包含预平衡发射时，P_{xn}值的绝对变化高达5-10%。
英文摘要
A model for $β$-delayed neutron emission is presented in which the emission of neutrons is allowed to occur before states populated in $β^-$ decay have reached equilibrium in the so-called "compound nucleus" picture. The pre-equilibrium neutron spectra are computed using a two-component exciton model, where neutron and proton, particle and hole degrees of freedom are treated independently. This model is implemented in the code BeoH to supplement the existing Hauser-Feshbach model for statistical decay of compound-nucleus states. The effect of a pre-equilibrium component in the total neutron spectrum on the single- and multi-neutron emission probabilities $P_{xn}$ is investigated for $β$-decay precursor nuclei in the regions $47\leq Z\leq 49,~83\leq N\leq 86$ and $54\leq Z\leq 58,~N=125,126$. An absolute change in the $P_{xn}$ values of up to 5-10% is observed in the $N=126$ region when including pre-equilibrium emission compared to the values predicted by the Hauser-Feshbach model alone.
