Hauser-Feshbach裂变碎片衰变模型在多机会裂变中的推广

A. Lovell, T. Kawano, Shin Okumura, I. Stetcu, M. Mumpower, P. Talou
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引用次数: 9

摘要

计算裂变碎片统计衰变的Hauser-Feshbach裂变碎片衰变模型,$\mathtt{HF^3D}$,已经扩展到包括多机会裂变,直到中子入射能量为20 MeV。决定论衰变以裂变前的量——裂变概率和导致裂变的平均能量——和裂变后的量——为输入,产生质量、电荷、总动能、自旋和宇称。从这些裂变碎片的初始条件出发,完整的衰变通过提示和延迟粒子发射进行,允许计算提示中子和$\gamma$性质,如多重性和能量分布,独立和累积裂变产率,以及延迟中子的可观测值。在这项工作中,我们将多机会裂变的实现描述为$\mathtt{HF^3D}$模型,并以$^{235}$U上的中子诱导裂变为例,展示了超过第一次机会裂变的提示量和延迟量的例子。这一扩展代表了在一致地模拟裂变系统中及时和延迟粒子的发射方面取得的重大进展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Extension of the Hauser-Feshbach fission fragment decay model to multichance fission
The Hauser-Feshbach fission fragment decay model, $\mathtt{HF^3D}$, which calculates the statistical decay of fission fragments, has been expanded to include multi-chance fission, up to neutron incident energies of 20 MeV. The deterministic decay takes as input pre-scission quantities - fission probabilities and the average energy causing fission - and post-scission quantities - yields in mass, charge, total kinetic energy, spin, and parity. From these fission fragment initial conditions, the full decay is followed through both prompt and delayed particle emissions, allowing for the calculation of prompt neutron and $\gamma$ properties, such as multiplicity and energy distributions, both independent and cumulative fission yields, and delayed neutron observables. In this work, we describe the implementation of multi-chance fission into the $\mathtt{HF^3D}$ model, and show an example of prompt and delayed quantities beyond first-chance fission, using the example of neutron-induced fission on $^{235}$U. This expansion represents significant progress in consistently modeling the emission of prompt and delayed particles from fissile systems.
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