  A Monte Carlo simulation algorithm to investigate the measurement of the
average prompt neutron multiplicity as a function of pre-neutron mass, for
fragments from the spontaneous fission of 252Cf is presented. The input data
consist of experimental measurements of the kinetic energy and mass
distributions obtained by Gook et al. and the values calculated using the
FIFRELIN model by Piau et al. We analyze the output curve obtained by
simulation of the 2E technique, which should ideally match the theoretical
curve. However, we find that the simulated as experiential curve exhibits a
maximum value at A=122, close to mass symmetry, while the pre-neutron curve has
a maximum at A=118. Additionally, we observe that que the simulated as pre
neutron values are higher than the theoretical values for A<90 and A>162,
respectively. We attribute this discrepancy to inaccuracies in the relationship
between provisional mass and the pre-neutron mass used in the 2E technique for
data processing in each fission event.
