减轻裂变化合物核衰变模拟中的不一致性
Alleviating the inconsistencies in modelling decay of fissile compound nuclei
摘要：
这项工作试图克服现有的不一致性，在模型中包括重要的物理效应，并通过系统的分析，在广泛的CN质量（ACN）的大量数据的裂变核衰变建模。该模型考虑了能级密度（LD）参量中的壳效应、裂变势垒中的壳修正、CN自旋取向自由度（Kor）的影响、能级密度集体增强（CELD）和裂变耗散。输入参数不被调整以再现来自特定反应的观测值，并且约化耗散系数被视为唯一的可调参数。计算的蒸发残渣（ER）截面，裂变截面和粒子，即中子，质子和α粒子，多重性进行了比较，覆盖ACN = 156-248的数据。该模型产生合理的适合ER和裂变激发函数的所有反应中考虑这项工作。超过ACN~200的计算低估了裂变前中子多重数。随着ACN的增加，需要越来越高的鞍前耗散强度值来再现数据。质子和α粒子的多重性，测量符合ER和裂变碎片，定性与模型预测。目前的工作在很大程度上缓解了现有的不一致的裂变氯化萘的统计衰变建模。
英文摘要：
This work attempts to overcome the existing inconsistencies in modelling decay of fissile nucleus by inclusion of important physical effects in the model and through a systematic analysis of a large set of data over a wide range of CN mass (ACN). The model includes shell effect in the level density (LD) parameter, shell correction in the fission barrier, effect of the orientation degree of freedom of the CN spin (Kor), collective enhancement of level density (CELD) and dissipation in fission. Input parameters are not tuned to reproduce observables from specific reaction(s) and the reduced dissipation coefficient is treated as the only adjustable parameter. Calculated evaporation residue (ER) cross sections, fission cross sections and particle, i.e. neutron, proton and alpha-particle, multiplicities are compared with data covering ACN = 156-248. The model produces reasonable fits to ER and fission excitation functions for all the reactions considered in this work. Pre-scission neutron multiplicities are underestimated by the calculation beyond ACN~200. An increasingly higher value of pre-saddle dissipation strength is required to reproduce the data with increasing ACN. Proton and alpha-particle multiplicities, measured in coincidence with both ERs and fission fragments, are in qualitative agreement with model predictions. The present work mitigates the existing inconsistencies in modelling statistical decay of the fissile CN to a large extent.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
