The classes in package janus.format.endf.data.energyangledistribub represent a collection of distributions.  There is one distribution for each reaction product.  This information is imported from FILE 6 in ENDF format.  FILE 6 includes neutrons, photons, charged particles, and residual nuclei.  The classes in this package are used when the energy and angular distributions of the emitted particles must be coupled for giving a concurrent description of neutron scattering and particle emission.

 

A reaction is defined by giving the production cross-section for each reaction product in barns/steradian assuming azimuthal symmetry:

 

σi(μ,E,E’) = σ(E) yi(E) fi(μ,E,E’)/2π

 

where   i denotes one particular product

E is the incident energy

E’ is the energy of the product emitted with cosine μ

σ(E) is the interaction cross-section

yi(E) is the product yield or multiplicity, and

fi is the normalized distribution with units (eV-unit cosine)-1