Impact of FIFRELIN input parameters on fission observables
Impact of FIFRELIN input parameters on fission observables
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FIFRELIN 输入参数对裂变可观测量的影响
DOI：
10.1051/epjconf/201819301003
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
O. Serot
中科院分区：
文献类型：
--
作者：
A. Chebboubi;O. Litaize;O. Serot
评估的核数据对核反应堆研究至关重要。为了显著提高核数据的精度，越来越多的基本裂变模型被用于评价过程。因此，裂变模型的测试成为一个中心问题。在这个框架中，FIFRELIN(裂变碎片蒸发导致核数据调查)是一个蒙特卡罗程序，开发的目的是模拟裂变碎片通过发射中子、γ和转换e-来去激发。FIFRELIN的计算依赖于几个模型，如伽马强度函数和核能级密度，以及更多的经验假设，如总激发能重新分配或由裂变反应给出的角动量。此外，预排放质量产额和单位质量的动能分布是进行模拟所必需的。选择一组五个自由参数来重现目标的可观测性。对于重碎片和轻碎片，这个可观测值通常对应于平均中子多重数。在这项工作中，研究了这组参数对不同输出观测值(中子发射几率、中子多重数作为裂变碎片质量的函数)的影响。
Evaluated nuclear data are essential for nuclear reactor studies. In order to significantly improve the precision of nuclear data, more and more fundamental fission models are used in the evaluation processing. Therefore, tests of fission models become a central issue. In this framework, FIFRELIN (FIssion Fragments Evaporation Leading to an Investigation of Nuclear data) is a Monte Carlo code developed in order to modelize fission fragments de-excitation through the emission of neutrons, γ and conversion e - . To be performed, a FIFRELIN calculation relies on several models such as gamma strength function and nuclear level density and of more empirical hypothesis such as total excitation energy repartition or angular momentum given by the fission reaction. Moreover, pre-emission mass yield and kinetic energy distribution per mass are necessary to process the simulation. A set of five free parameters are chosen to reproduce a target observable. Often this observable corresponds to the mean neutron multiplicity for heavy and light fragment. In this work, the impact of the set of parameters on different output observables (neutron emission probability, neutron multiplicity as function of the fission fragment mass) is investigated.