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Add support for CEPXS cross sections#955

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wdhawkins wants to merge 2 commits intoOpen-Sn:mainfrom
wdhawkins:cepxs
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Add support for CEPXS cross sections#955
wdhawkins wants to merge 2 commits intoOpen-Sn:mainfrom
wdhawkins:cepxs

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@wdhawkins wdhawkins commented Feb 27, 2026

This PR adds support for CEPXS cross sections in bxslib format. This gives us the ability to do coupled electron-photon transport. Note that this PR also includes a new field function for reporting energy deposition. This is just a reaction rate field function and can be removed when the post-processing code is merged. I've added two regression tests from SAND-89-2211 (https://www.osti.gov/servlets/purl/6758232):

1. II.3.C2 - 1.0 MeV electrons normally incident on an Al slab (no coupling):
image

2. II.3.D - 1.0 MeV electrons normally incident on a Cu slab (full coupling):
image

@wdhawkins wdhawkins self-assigned this Feb 27, 2026
@wdhawkins wdhawkins added the enhancement New feature or request label Feb 27, 2026
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The 2 tests are using inp extension instead of py. Why?

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wdhawkins commented Feb 27, 2026

The 2 tests are using inp extension instead of py. Why?

No good reason. :) Probably just a function of the late hour at which they were added. I'll fix that and add the reference solutions so they pass.

@wdhawkins wdhawkins force-pushed the cepxs branch 2 times, most recently from 2449e36 to a7d05cb Compare February 27, 2026 20:18
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The 2 tests are using inp extension instead of py. Why?

Fixed.

@wdhawkins wdhawkins force-pushed the cepxs branch 3 times, most recently from a06592f to 8105d33 Compare March 19, 2026 04:19
@wdhawkins wdhawkins force-pushed the cepxs branch 4 times, most recently from 1e8d6f8 to 115c977 Compare March 27, 2026 03:52
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