sesh calculates corrections for time-of-flight experimental data.

The code sesh presented here is a modernized version of SESH re-written in Modern Fortran. Original code is by F.H. Froehner published in the report: "SESH - A Fortran IV Code For Calculating the Self-shielding and Multiple Scattering Effects For Neutron Cross Section Data Interpretation in the Unresolved Resonance Region", Report GA-8380 (1968). This code has been adapted over the years from the input of several nuclear data researchers and their contributions are appreciated.

sesh solves the problem of resonance self-shielding, the experimental effect seen in time-of-flight experiments where the measured time/energy-averaged transmission data cannot be compared directly to theoretical cross section due to the inequality:

for non-linear equations.

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Getting Started

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Requirements:

• Fortran compiler: gfortran (gcc 10.2)

It should work with other compilers, but has only recently been tested with gfortran.

To compile:

Run the following in a bash-like terminal starting in the sesh main project directory:

mkdir build
cd build
../compile-sesh.sh ../
make

This will put the sesh executable in your sesh/build/ directory.

To run executable:

Open bash-like terminal and run:

sesh

which will prompt you for input and output file names. If you have already defined these names in a dedicated file like auto-in, you can simply run sesh < auto-in. To run the example file provided, from the sesh/build/ directory run:

sesh < ../auto-in

Input Files

An input file called ta181.inp is given as an example for SESH input. The SESH input is more fully defined in the report by F. Froehner described here.

Input file notes to augment Frohner's report:

• After the energy groups and number of histories card you must include a line with a space in it
• An update was made to include a description of beam radius on sample (at/b), this follows geometry card 3.3