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h2o_simple.rst

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H in H2O (Single temperature)

This example serves as an example input that would allow a user to write the thermal scattering law S(α, β) describing hydrogen bound in water onto an existing PENDF tape. Note that parentheses following the forward slash will indicate the card number.


Card 1

exampleInputs/simple_H_H2O

The first line defines the module, which is THERMR.

The second line is Card 1, which has the following input values:

nendf 24
tape24 contains thermal scatteing data (typically, this is
produced using the LEAPR module of NJOY)
nin 23
tape23 contains the input PENDF tape (this may come our of
RECONR/BROADR modules, for instance)
nout 25 tape25 is the tape onto which THERMR writes its output

Card 2

exampleInputs/simple_H_H2O

matde 101
Set to 101. This must match the ID used to generate the thermal
scattering data tape (in this case, tape24). If using LEAPR to get
tape24, then this must match the first value on Card 4 of the
LEAPR input (mat).
matdp 1301
Set to 1301. This must match the material identification number
used to generate tape23. For example, if tape23 was generated
using BROADR, then this might match the first value of Card 2 (mat1).
nbin 8 Requesting 8 equiprobable bins in the final THERMR ouput
ntemp 1
Requesting 1 temperature. This must match the number of values
provided on Card 3 of the THERMR input
iin 2
The value of 2 here asserts that the inelastic scattering cross
sections should be generated by reading in the scattering law
S(α, β) from the tape24
icoh 0 No elastic option is requested
iform 0 The value of 0 here indicates E-E'-mu ordering, which is the standard
natom 2 This is the number of principal atoms
mtref 222
The inelastic output on tape25 will be written to MF=6/MT=222 and
the elastic output (if it were applicable) would be written to
MF=6/MT=223
iprint 2 Maximum printing verbosity requested

Card 3

exampleInputs/simple_H_H2O

Card 3 is a list of the temperatures desired for this THERMR run. The number of values on this line must match the ntemp value provided in Card 2. Additionally, any temperatures specified here must have corresponding data available in the input thermal scattering (tape24) file and the input PENDF (tape23) tape. Here, we choose 296.0 K.


Card 4

exampleInputs/simple_H_H2O

Card 4 specifies the tolerance and maximum energy to considered during this THERMR run.

tol 0.05
Tolerance used while refining energy cross sections.
emax 0.625 eV
Maximum neutron energy for which thermal treatment will be applied