“…It was later applied to the statistical decay of light fragments of proton-induced spallation reactions [4][5][6] and is now included as the preferred option for the equilibrium statistical decay of light fragments in widely-used nuclear reaction/transport codes, such as FLUKA [7] and GEANT4 [8]. A variant called the phase space model, which partially takes incomplete equilibration into account, plays an important role in the analysis of experimental multi-particle fragmentation spectra in light-ion reactions [9][10][11][12][13]. In the context of nuclear reactions, the FBM usually assumes that fragments are emitted in their ground states or in (almost) particle-stable excited states and is formulated directly in terms of a phase-space integral limited only by the constraints of linear momentum and energy conservation.…”