Fission mechanism inferred from nuclear shape fluctuation by the Langevin equation

Fission mechanism inferred from nuclear shape fluctuation by the Langevin equation
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通过朗之万方程从核形状波动推断裂变机制

DOI:
10.1103/physrevc.105.034604
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发表时间:
2022
期刊:
影响因子:
3.1
通讯作者:
Ohta M.
Ohta M.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Aritomo Y.;Iwamoto A.;Nishio K.;Ohta M.

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核形变空间中朗之万轨道的分析是理解裂变过程的动力学研究之一。分析的主要目的是阐明Langevin方程中由随机力引起的特征核形振荡及其对裂变过程的影响。特征随机振荡起源于过阻尼条件的要求。方程中摩擦张量的性质揭示了定向核形状涨落起源于核形变子空间。我们的计算表现出很好的协议与裂变数据的费米同位素,裂变碎片的质量分布的变化显着的不对称形状的尖锐的对称形状的裂变Fm同位素的质量增加。
One of the dynamical investigations foran understanding of the fission process is the analysis through Langevin trajectories in the nuclear deformation space. The main motivation of this analysis is to elucidate the characteristic nuclear-shape oscillation induced by a random force in the Langevin equation and its impact on the fission process. The characteristic random oscillation originates from the requirement of an overdamped condition. The properties of the friction tensor in the equation reveal that the directional nuclear shape fluctuations originate in the subspace of nuclear deformation. Our calculations exhibit a good agreement with the fission data for fermium isotopes, where the fission-fragment mass distribution changes dramatically from the asymmetric shape to the sharp symmetric shape as the masses of the fissioning Fm isotopes increase.
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