Fission-fragment KE appearing under 'missing' rather than 'nuclear recoils and heavy fragments'

Scoring
1

Versions

Please provide the used software versions.

FLUKA: 4-5/2
Flair:

Description

FLUKA 4-5.2, PRECISIO + EVAPORAT + IONTRANS -2, fission-fragment KE appearing under ‘missing’ rather than ‘nuclear recoils and heavy fragments’ — is this deposited-but-mis-booked or genuinely not deposited? Have tried beams of 1 MeV antiprotons, 100+ MeV protons, and 2 MeV neutrons as the driving source and see the same deficit.

Input files

Please upload all relevant files. (FLUKA input file, Flair project file, user routines, and data files)

u_fisstest_small.inp (1.3 KB)

u_fisstest_big.inp (1.3 KB)

4

There is no wrong booking nor deficit of energy deposition. What appears as missing energy just reflects the opposite of the Q-value of the nuclear reactions transforming kinetic energy into mass (negative Q value, positive missing energy) or viceversa, like in a low-energy fission event (positive Q value, negative missing energy). It accounts for the unbalance between the initial kinetic energy and the final kinetic energy.
The kinetic energy of fission fragments, made available by means of a negative missing energy, is deposited as dE/dx.