Geiger-Marsden Experiment Simulation

卢瑟福α粒子散射实验模拟

Usage

1. Load runtime and packages

   source "$(spack location -i geant4)/bin/geant4.sh"
   spack load cmake geant4 root
   
   

2. Configure and compile

   mkdir -p build && cd build
   cmake ..
   cmake --build . -j4
   

3. Run with command-line parameters

   ./build/rutherford \
     --threads 1 \
     --foil-thickness-um 4 \
     --particle-energy-mev 5.486 \
     --events 100000 \
     --outdir results \
     --tag testA
   

4. Run with macro file

   ./build/rutherford --macro run.mac --outdir results --tag macroA
   

5. Legacy positional macro mode (equivalent to --macro)

   ./build/rutherford run.mac --outdir results
   

Output Naming

• Command-line mode:

  Rutherford_th{threads}_foil{thickness}um_e{energy}MeV_n{events}_{tag}.root

• Macro mode:

  Rutherford_macro_{macroName}_{tag}.root

• Plot image uses the same suffix with prefix rutherford_scattering_.

All outputs are written to --outdir.

Notes

• In macro mode, --threads, --foil-thickness-um, --particle-energy-mev, --events are ignored.
• Use --no-plot to skip generating PNG and only keep ROOT data.
• In macro files, set primary alpha energy by /generator/energy <value> MeV after /run/initialize.