Monte Carlo algorithm for calculating pre-neutron fragment mass and kinetic energy distributions from measurements using the 2E Technique for reaction 235U(nth,f)

Montoya M.; Roca M.; Alvarez M. · Revista Mexicana de Fisica (2025) · DOI: 10.31349/revmexfis.71.031203

Resumen

A nuclear fission event of an actinide results in the formation of two complementary primary fragments with masses (A;A′), which subsequently acquire kinetic energies (E;E′) due to Coulomb repulsion. Following this, they emit (n; n′) prompt neutrons, isotropically relative to their respective centers of mass, each with their respective kinetic energies (η1; η2; : : :; ηn; η1; η2; : : :; ηn′ ). Consequently, due to recoil effects, the fragments reach the detectors with altered kinetic energies (e; e′). This study simulates an experiment using the 2E technique, intending to measure the distribution of (e; e′) and (n; n′), from which it aims to infer the distribution of A;E and the average prompt neutron multiplicity as a function of pre-neutron fragment mass º(A). For this purpose, a distribution of primary or pre-neutron quantities is assumed as input to a Monte Carlo simulation algorithm of the experiment, whose output data should reproduce the values observed in that experiment. © (2025), (Sociedad Mexicana de Fisica). All rights reserved.

Instituciones: Universidad Nacional de Ingeniería