43// Continuous processes acting on adjoint particles to correct continuously their weight during the adjoint reverse tracking.
44// Thi process is needed whene the adjoint cross section are not scaled such that the total adjoint cross section match the total forward cross section.
45// By default the mode where the total adjoint cross section is equal to the total forward cross section is used an therefore this along step weight
46// correction factor is 1.
47// However in some cases (some energy ranges) the total forward cross section or the total adjoint cross section can be null, in this case the along step
48// weight correction is neede and is given by exp(-(Sigma_tot_adj-Sigma_tot_fwd).dx)