v1.7.5 - SRIM Stopping-Power Cross-Check
Adds an independent SRIM stopping-power cross-check for all six heavy-ion primaries, complementing the existing nuclear-reaction-focused validations (CREME-MC, McNulty/CUPID, Hitachi).
SRIM stopping-power cross-check
Macros/run_<ion>_srim_check.mac: a small (1000-event), unbiased run per ion, deliberately sized so direct ionization dominates the mean deposited energy and rare nuclear reactions stay statistically negligible.- Mean deposited energy through the standard 8 um Si sensitive volume converts to an implied LET, compared against SRIM's reported electronic stopping power for the same ion/energy/material (15 MeV/amu each):
| Ion | Energy | PANDA LET (MeV*cm2/mg) | SRIM (MeV*cm2/mg) | Ratio |
|---|---|---|---|---|
| C12 | 180 MeV | 0.884 | 0.906 | 0.976 |
| F19 | 285 MeV | 1.966 | 2.029 | 0.969 |
| Cl35 | 525 MeV | 6.606 | 6.732 | 0.981 |
| Ni58 | 870 MeV | 15.924 | 16.23 | 0.981 |
| I127 | 1905 MeV | 42.736 | 48.92 | 0.874 |
| Au197 | 2955 MeV | 74.147 | 77.90 | 0.952 |
- Five of six agree within 5%; I127 is the outlier at 13%, investigated and attributed to ordinary Geant4-vs-SRIM stopping-power model variation rather than a methodology artifact (its shorter range relative to the dead+sensitive stack was ruled out as the cause -- too small a range fraction to matter).
- Full writeup in
Documentation/PANDA_VALIDATION_SUMMARY.mdSection 1.4.
See README.md for details.