5.22. [ Repeated Collisions ] section

In this section, you can set some parameters used in this function to repeat the collisions. The collisions treated in this function are restricted to non-elastic collisions described by the reaction models excluding the reactions using the nuclear data. This function is enable to reduce the statistical fluctuation of the secondary products of the reactions, and very effective for important secondary particles produced through special reaction channels with small cross section. According to the repeated number, we change the weight of the produced particles. After the repeated collision, weight cut off is performed but secondary particles are tallied before killed by the weight cut off.

Maximum 6 [repeated collisions] sections are allowed to be defined in an input file.

The format is as follows.

[ Repeated Collisions ]
  part = proton neutron
  mother = 2
    207Pb  208Pb
  emin = 800
  emax = 10000
  reg   n-coll  n-evap
  66    50      1
  67    10      1
  68    10      10

Projectile particle are set as part= in the first line. The default is part= all. Mother nuclei are also set as mother=, which is number of mother nuclei, and in the sequential lines the mother nuclei are defined. The default is all nuclei in the cell. emin and emax define the maximum and minimum energies of the projectile particles which are considered in this section. The default is all energy of the projectile. Three columns should be defined, reg is the cell number for the repeated collisions, n-coll is the number of repeated collision for the dynamical reaction processes, while n-evap for the evaporation processes, respectively.