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In this case, RECONR reads the original ENDF tape and reconstructs
the resonances and nonlinear interpolation schemes to prepare a
PENDF (pointwise ENDF) tape on unit 21. BROADR reads the PENDF
tape, Doppler broadens the pointwise cross sections, and writes
a new temperature-dependent PENDF tape on unit 22. Sometimes it
needs some data from the ENDF tape, and this is why
tape20 is also provided as input. Next, the
information from the ENDF and PENDF tapes is run through the
multigroup averaging process and written in GENDF format (a special
groupwise variation of the ENDF format) on tape23.
Finally, the multigroup constants on tape23 are
converted to DTF format on tape24. The PENDF input
for DTFR is used for the plots, which appear on
tape25.
All NJOY jobs are variations of this basic data-flow structure.
I/O units with numbers from 20 up can be used to couple the
modules together, for the original input files, or for output
files. NJOY always names these "tape20", "tape21", and so on.
Units from 10 to 19 are used as scratch files. They may be named
as tapes, or have special system names. Units with numbers
below 10 are used for system input and output files, such as
"output".
NJOY is normally run under the control of some kind of system
shell. For unix, the NJOY input commands go into the standard
input, and runtime messages go out on the standard output.
Therefore, if the input "deck" (such as the one outlined above)
is named "inx", the following would cause a normal NJOY run to
execute:
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