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Nonequilibrium information entropy approach to ternary fission of actinides
Physical Review C ( IF 3.1 ) Pub Date : 2021-06-02 , DOI: 10.1103/physrevc.103.l061601
G. Röpke , J. B. Natowitz , H. Pais

Ternary fission of actinides probes the state of the nucleus at scission. Light clusters are produced in space and time very close to the scission point. Within the nonequilibrium statistical operator method, a generalized Gibbs distribution is constructed from the information given by the observed yields of isotopes. Using this relevant statistical operator, yields are calculated taking excited states and continuum correlations into account, in accordance with the virial expansion of the equation of state. Clusters with mass number A10 are well described using the nonequilibrium generalizations of temperature and chemical potentials. Improving the virial expansion, in-medium effects may become of importance in determining the contribution of weakly bound states and continuum correlations to the intrinsic partition function. Yields of larger clusters, which fail to reach this quasiequilibrium form of the relevant distribution, are described by nucleation kinetics, and a saddle-to-scission relaxation time of about 7000 fm/c is inferred. Light-charged particle emission, described by reaction kinetics and virial expansions, may therefore be regarded as a very important tool to probe the nonequilibrium time evolution of actinide nuclei during fission.

中文翻译:

锕系三元裂变的非平衡信息熵方法

锕系元素的三元裂变探测核分裂时的状态。光团在非常接近分裂点的空间和时间中产生。在非平衡统计算子方法中,根据观测到的同位素产率给出的信息构建广义吉布斯分布。使用这个相关的统计算子,根据状态方程的维里展开式,在考虑激发态和连续相关性的情况下计算产率。具有质量数的簇一种10使用温度和化学势的非平衡概括很好地描述了。改善维里膨胀,介质内效应在确定弱束缚态和连续相关性对内在分配函数的贡献方面可能变得很重要。未能达到相关分布的这种准平衡形式的较大簇的产率由成核动力学描述,并推断出约 7000 fm/c 的鞍到断裂弛豫时间。因此,由反应动力学和维里膨胀描述的带光粒子发射可以被视为探测裂变过程中锕系元素核非平衡时间演化的非常重要的工具。
更新日期:2021-06-02
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