The cross sections vs energy generated by THERMR
are put into File 3 as simple tabulations using the
MT number (or numbers) requested by the user. The
energy-angle distributions appear as normalized
distributions in File 6. For a specified grid of
incident energies, a distribution vs secondary
energy is given on a grid chosen to represent the
actual angle-integrated function to a specified
accuracy. At each secondary energy, a specified
number of discrete scattering cosines is given with
a predetermined set of probability values. This
format allows for easy sampling in a Monte Carlo code,
and it can also produce good values for Legendre
coefficients when needed.
As an example of the THERMR run, consider the following
26 22 23
1065 1306 8 1 4 1 1 229 0
To understand this input, compare it with the
THERMR input instructions.
This run is for carbon from ENDF/B-V (MAT=1306). Thermal
MAT=1065 is graphite from the thermal ENDF file Tape 322
mounted on unit 26. The results will be written on the
new PENDF tape on unit 23 using MT=229 and 230.