Tool for estimating (α,n) reaction yields given some known radioactive contamination in a given material
GitHub: https://github.com/shawest/neucbot
Geant4 module for improving simulations of (n,γ) reactions, using data to simulation de-excitation cascades
GitHub: https://github.com/UCRDarkMatter/CASCADE
Tool for simulating scintillation and ionization signals in LAr and LXe
Website: https://nest.physics.ucdavis.edu/
For α particles...
ASTAR: https://physics.nist.gov/PhysRefData/Star/Text/ASTAR.html
For protons...
PSTAR: https://physics.nist.gov/PhysRefData/Star/Text/PSTAR.html
For electrons...
ESTAR: https://physics.nist.gov/PhysRefData/Star/Text/ESTAR.html
For x-rays/γ-rays
X-Ray Mass Attenuation Coefficients: https://www.nndc.bnl.gov/capgam/byTarget/
Gamma Explorer: http://www.gammaexplorer.com/wp-content/uploads/2014/03/gammaenergies.pdf
NuDat3: https://www.nndc.bnl.gov/nudat3/
CapGam: https://www.nndc.bnl.gov/capgam/byTarget/
ENDF: https://www.nndc.bnl.gov/endf/
EXFOR: https://www-nds.iaea.org/exfor/
Calculator: https://skisickness.com/2010/04/relativistic-kinematics-calculator/
See also the author's discussion of the underlying physics: https://skisickness.com/2010/04/25/