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 Cascade model. It is best used at energies below 200 MeV and medical applications.
- 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. as it as more accurate modeling of low-energy neutron and heavy ions.
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.