Maxwellian Average :
where T denotes the temperature, and kB the Boltzmann constant. The upper and lower limits of integration, EL and EU are set to 10−5 eV and 10 eV, respectively.
Resonance Integral :
with EL = 0.5 eV and EU = 10 MeV.
U-235 Thermal Fission-Neutron Spectrum Average (Fiss. Spec. Average) :
with EL = 10−5 eV and EU = 20 MeV. The parameters a and b are 0.988 MeV and 2.249 MeV−1, respectively. The fission spectrum is based on Watt's formula (Phys. Rev. 87, 1041 (1952)).
Westcott g-factor :
νp, νd : numbers of prompt and delayed neutrons per fission.