4. METHOD OF SOLUTION
In COMNUC Hauser-Feshbach theory as modified
by Moldauer is used to determine competition in the decay of the
compound nucleus. Physical models for the various reaction types
permit the user to input parameters for those models. Direct
reaction components may be provided by card input. These cross
sections are combined with calculated compound nucleus cross
sections to provide a complete self-consistent set of neutron
cross sections at each incident neutron energy.
In CASCADE a coupled set of inhomogeneous Volterra equations of
the second kind describing the energy dependence of the
probability for particle termination of a gamma ray cascade is
solved numerically. Branching ratios determined from these
probabilities may be used as input to the COMNUC program.