7.18.3} Biasing options for low-energy neutrons

 The special multigroup transport structure used by FLUKA for low-energy
 neutrons calls for some biasing options specific to these particles. We have
 just introduced the weight window command WW-PROFIle. Two more options are
 LOW-BIAS, which has already been mentioned before in the context of energy
 cutoffs, but which is used also to set a user-defined non-analogue absorption
 probability, and LOW-DOWN, by which it is possible to bias neutron
 thermalisation (downscattering). The latter, however, is an option recommended
 only to users with a good knowledge and experience of neutronics.

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