论文标题
采用$^{242} $ pu的三元裂变作为非常中子富的探针
Employing ternary fission of $^{242}$Pu as a probe of very neutron rich matter
论文作者
论文摘要
详细评估了对三元裂变现有实验数据建模的最新理论方法的能力，证实了前面的迹象，表明三元裂变中簇形成的主要模式是簇状的，非常中子富含，非常低的密度，实质上是化学平衡的，核次物质。在热中子诱导的反应$^{241} $ pu（$ n _ {\ rm th} $，f）中，对这些方法应用于三元裂变产率的扩展研究和比较已进行完善源物质的表征。谐振气体近似已改善对结合能的中等影响。温度为1.29 meV，密度为$ 6.7 \ times 10^{ - 5} $ nucleons/fm $^3 $，质子分数$ y_p $ = 0.035，可以很好地表示三元发射光颗粒和簇的收益率。特别是，$ z = 1 $的结果和2个同位素。讨论了具有较大$ z $的同位素，即使在非常低的密度下，培养基和连续效应的作用也是如此。
Detailed assessments of the ability of recent theoretical approaches to modeling existing experimental data for ternary fission confirm earlier indications that the dominant mode of cluster formation in ternary fission is clusterization in very neutron rich, very low density, essentially chemically equilibrated, nucleonic matter. An extended study and comparison of these approaches applied to ternary fission yields in the thermal neutron induced reaction $^{241}$Pu($n_{\rm th}$,f) has been undertaken to refine the characterization of the source matter. The resonance gas approximation has been improved taking in-medium effects on the binding energies into account. A temperature of 1.29 MeV, density of $6.7 \times 10^{-5}$ nucleons/fm$^3$ and proton fraction $Y_p$ = 0.035 are found to provide a good representation of yields of the ternary emitted light particles and clusters. In particular, results for $Z= 1$ and 2 isotopes are presented. Isotopes with larger $Z$ are discussed, and the roles of medium and continuum effects, even at very low density are illustrated.
