The physics tab can be used to specify particle cuts and physics options for the simulation.
gamma cut: A secondary gamma particle will not be produced if it can not travel further than the cut specified here, and the primary will drop to zero energy.
gamma units: The length units of the gamma cut.
electron cut: A secondary electron particle will not be produced if it can not travel further than the cut specified here, and the primary will drop to zero energy.
electron units: The length units of the electron cut.
proton cut: A secondary proton particle will not be produced if it can not travel further than the cut specified here, and the primary will drop to zero energy.
proton units: The length units of the proton cut.
positron cut: A secondary positron will not be produced if it can not travel further than the cut sepecified here, and the primary will drop to zero energy.
positron units: The length units of the positron cut.
- electromagnetic physics
- Op 0 This is the fastest option for medium and high energy applications.
- Op 1 This is very similar to Op 0, but with a less accurate MSC step limiation.
- Op 3 Best used in medical applications, has a more accurate MSC step for all particles.
- Op 4 This will provide the highest accuracy as it is a GS MSC model with Mott correction and error-free stepping for electrons and positrons.
- LIV This adds a Livermore model for elctrons and gammas below 1 GeV on top of the Op 0.
- LIV POL This adds a polarized extension to the livermore model.
hadronic physics
- FTFP BERT This is recommended for HEP processes, with all standard EM processes, a Bertini-style cascade for hadrons <5 GeV and the Fritiof model for energies >4 GeV. This will provide the most accurate, but slowest simulation.
- QGSP BIC This implements standard EM, Quark Gluon String above 18 GeV and a Binary Ccascade model. It is best used at energies below 200 MeV.
- Shielding
- This is based off FTFP BERT, with some modifications. The neutron model is based on JENDL data, ion interactions use a QMD Model which is slightly better than FTFP BERT. Originally developed for SuperCDMS dark matter research. Recommended for shielding, space physics and HEP applications.
extra
- HP Adds a high precision neutron model, note this is automatically included with Shielding hadronic physics.
- RDM Adds a radioactive decay model, this is automatically included with Shielding hadronic physics.