Add CHIPS gamma-nuclear cross sections #2149

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whokion wants to merge 16 commits intoceleritas-project:developfrom

whokion:gamma-nuclear-xs

Commits on Dec 5, 2025

Add EmExtraPhysicsHelper to wrap cross-section calculations from G4GammaNuclearXS
Soon Yung Jun
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Add EmExtraPhysicsHelper
Soon Yung Jun
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Includes CHIPS-based gamma–nuclear cross sections for the high-energy region.
Soon Yung Jun
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Use a common reals backend array for both cross-section grids
Soon Yung Jun
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Use a common reals backend array for both cross-section grids
Soon Yung Jun
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Use VectorUtils::geomspace to construct the logarithmic energy binning and move the class description to the header
Soon Yung Jun
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Add citation for the CHIPS gamma–nuclear cross-section model
Soon Yung Jun
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Update for changes in data
Soon Yung Jun
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Commits on Dec 6, 2025

Address more review comments and suggestions from Seth
Soon Yung Jun
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Fix CELERITAS_USE_GEANT4 addition
Soon Yung Jun
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Add a missing definition for CELERITAS_USE_GEANT4
Soon Yung Jun
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Fix compilation error related to return type
Soon Yung Jun
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Fix compilation error related to return type
Soon Yung Jun
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Fix compilation error related to return type
Soon Yung Jun
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ix incorrect syntax with ()
Soon Yung Jun
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Fix compilation error related to unused-parameter
Soon Yung Jun
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