As demonstrated on the preceeding pages, temperature dependence
can be introduced by Doppler broadening smooth cross sections
at low energies (less than about 16kT/A). In addition,
cross sections with features that are sharp with respect to
kT/A, such as resonances, will show temperature dependence.
Therefore, the reactions that need to be Doppler broadened are
normally elastic, fission, and capture. Sometimes (n,alpha)
reactions are present at low energies also. Cross sections in
the unresolved resonance range cannot be broadened (see UNRESR
The maximum energy for broadening,
It is possible that these reactions will show no changes under Doppler broadening over much of this energy range. For example, resonances in light isotopes tend to be broad with respect to thermal energies. However, we usually just go ahead and run BROADR on everything.
If you want to use NJOY cross sections for supernova calculations,
you may want to include more reactions, such as the first few
inelastic levels. There is an option with
|23 January 2013||T-2 Nuclear Information Serviceemail@example.com|