Unified description of the fission probability for highly excited nuclei

Unified description of the fission probability for highly excited nuclei
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高激发核裂变概率的统一描述

DOI:
10.1080/00223131.2018.1539351
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发表时间:
2018
影响因子:
1.2
通讯作者:
Meigo Shin-ichiro
Meigo Shin-ichiro
中科院分区:
工程技术4区
文献类型:
--
作者:
Iwamoto Hiroki;Meigo Shin-ichiro

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根据Liége核内级联模型(INCL)4.6版的核内级联计算和Prokofiev的质子感生裂变截面唯象系统学,提出了一个描述高能裂变模型裂变几率的新模型.该模型在广义蒸发模型(GEM)的去激发模型中得到实现,并应用于粒子和重离子输运程序系统(PHITS)的蒙特卡罗空间反应模拟。与次锕系核的实验数据比较表明,该模型能提供质子、中子和氘感生裂变截面的统一预测,并具有明显提高的精度。计算出的裂变碎片倾向于向更高的质量数移动。为了解释耦合INCL/GEM框架内裂变碎片的同位素分布,需要对INCL进行修改,特别是用于描述剩余核的高激发态。
We present a new model to describe the fission probability of the high-energy fission model, as deduced from the intra-nuclear cascade calculation with the Intra-Nuclear Cascade model of Liége (INCL) version 4.6 and Prokofiev’s phenomenological systematics of the proton-induced fission cross-sections. This model is implemented in the de-excitation model of the generalized evaporation model (GEM), and applied to Monte Carlo spallation reaction simulation using the Particle and Heavy Ion Transport code System (PHITS). Comparing with experimental data for subactinide nuclei shows that this model can provide a unified prediction of the proton-, neutron-, and deuteron-induced fission cross-sections with markedly improved accuracy. The calculated fission fragments tend to shift to higher mass numbers. To account for the isotopic distributions of fission fragments within the framework of a coupled INCL/GEM, modification of INCL would be required, especially for description of the highly excited states of residual nuclei.
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