Speaker
Description
The evaluation of $^{239}$Pu neutron resonance parameters coupled to neutron multiplicities $\bar{\nu}_{p}$ is of particular importance to investigate the $(n,\gamma f)$ reaction in which a $\gamma$-ray emission occurs before the scission of the compound nuclear. This reaction has offered one explanation for the fluctuations in the measured values of $\bar{\nu}_{p}$. In this regard, the competition between $(n,\gamma f)$ reaction and the direct fission process can be also included in the $R$-matrix analysis of fission and capture measured data.
The goal of this work is the coupled evaluation of the $n$+$^{239}$Pu resonance parameters and related neutron multiplicities by ensuring the adoption of thermal neutron constants recently evaluated at the International Atomic Nuclear Energy as well as the recommended (thermal-neutron) induced prompt neutron fission spectrum. Moreover, this new set of physical evaluated quantities should also guarantee the agreement for high-leakage solution benchmarks while keeping the good performance of large thermal solution assemblies.