The fission yield calculations with Langevin model, Hauser-Feshbach statistical decay, and beta decay

¹ NAPC-Nuclear Data Section, International Atomic Energy Agency
² Los Alamos National Laboratory
³ Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology

^* e-mail: s.okumura@iaea.org
^** e-mail: kawano@lanl.gov
^*** e-mail: chiba.satoshi@nr.titech.ac.jp

Published online: 30 September 2020

Abstract

We performed the calculations of de-excitation of the primary fission fragments by the Hauser-Feshbach statistical decay followed by the β decay of de-excited fission products. We used the primary fission fragment mass distributions Y_P(A), total kinetic energy TKE(A), and its width σ_TKE(A) as input, which were calculated with the Langevin model using macroscopic-microscopic models of the potential energy surface. The prompt neutron multiplicity v̅ and the independent fission product yield (FPY) Y_I(Z, A, M) and cumulative FPY Y_C(Z, A, M) are calculated by the Hauser-Feshbach statistical decay and β decay calculations, respectively. The calculated v̅ was overestimated approximately 17% compared to the evaluated data. The decay heats from β and γ were in accordance with the experimental results. The β delayed neutrons yieild was also overestimated.