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There are a number of physical quantities that can be computed
from ENDF data, but that are not explicitly included in most
ENDF files. NJOY uses its data-flow model to generate such
quantities and add them to a PENDF tape. Several of these
physical quantities will be discussed in the following pages:
- Gas-production cross sections (sometimes called
charged-particle production) are produced by the GASPR
module and add to File 3 of a PENDF tape using the
MT numbers from 203 (H-1 production) to 207 (He-4
production). These cross sections are normally sums over
several of the reactions found on a normal ENDF-format
evaluation.
- Heating and radiation damage cross sections are generated
by the HEATR module and added to File 3 of a PENDF tape
using special MT numbers. Values of 300+MT are used to
represent heating associated with MT; normally only MT=301
for total heating is given. A special value of MT=444 is
used for total radiation damage energy production, and some
other values nearby are used for the components of damage,
if desired.
- Thermal scattering cross sections that take the binding of
the target atom into account are produced in the THERMR
module. Results are added to both File 3 (cross sections)
and File 6 (energy-angle distributions) using a special
set of MT numbers including MT=221 for free gas scattering,
MT=222 for hydrogen bound in water, and higher MT values for
other important moderating materials.
The modular nature of the NJOY data-flow model allows you to
include these additional physical quantities or omit them,
depending on the needs of your particular applications.
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