Draft: Update Sexaquark anhillation simulation
Hi @jzhuo, I've made some more changes. Could you check if you agree with them and if necessary (propose to) change them? Here's a brief overview:
- GetA() -> GetN() to get the right units
- Cross section depends on number of protons or neutrons in material
- Disallowed 3 body anhillation (Charged and Neutral interaction)
- Randomly select atom/isotope instead of always the first/same one (Charged and Neutral interaction)