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Summary of the physics processes

The computer simulation of particles traversing an experimental setup has to take into account the interactions of those particles with the material of the detector. GEANT is able to simulate the dominant processes which can occur in the energy range from 10 keV to 10 TeV for electromagnetic interactions. As far as hadronic interactions are concerned, the range of validity is the one of the hadronic packages used, which usually does not extend below a few tens of MeV. For more information the user is invited to consult the relevant documentation [,,,,,].

Simulating a given process means:

Evaluating the probability of occurrence of the process, by sampling the total cross-section of the process.
Generating the final state after interaction, by sampling the differential cross-section of the process.
In case of (quasi-)continuous processes, e.g. CSDA (Continuous Slowing Down Approximation), energy losses or multiple scattering, computing the mean values of some characteristic quantities.

In Table

below we summarise all the processes currently implemented in GEANT, with a reference to the corresponding sections.

Computation of total cross-section or energy losses Generation of the final state particles

Processes involving the photon
( $e$ ⁺,e^- ) pair conversion PHYS 210 PHYS 211
Compton collision PHYS 220 PHYS 221
Photoelectric effect PHYS 230 PHYS 231
Photo fission of heavy elements PHYS 240 PHYS 240
Rayleigh effect PHYS 250 PHYS 251

Processes involving $e$ ^-/e⁺
Multiple scattering PHYS 320or 325 or 328
Ionisation and $δ$ -rays production PHYS 330 PHYS 331or 332
Bremsstrahlung PHYS 340 PHYS 341
Annihilation of positron PHYS 350 PHYS 351
Generation of Cerenkov light PHYS 260 PHYS 260
Synchrotron radiation PHYS 360

Processes involving $μ$ ^-/ μ⁺
Decay in flight CONS 310 PHYS 400
Multiple scattering PHYS 320or 325
Ionisation and $δ$ -rays production PHYS 430 PHYS 331or 332
Ionisation by heavy ions PHYS 431
Bremsstrahlung PHYS 440 PHYS 441
Direct ( $e$ ⁺,e^- ) pair production PHYS 450 PHYS 451
Nuclear interaction PHYS 460 PHYS 460
Generation of Cerenkov light PHYS 260 PHYS 260

Processes involving hadrons
Decay in flight CONS 310 PHYS 400
Multiple scattering PHYS 320or 325
Ionisation and $δ$ -rays production PHYS 430 PHYS 331or 332
Hadronic interactions PHYS 500 or 510 PHYS 500 or 510
Generation of Cerenkov light PHYS 260 PHYS 260

Table: Processes currently implemented in GEANT

Next: Simulated Processes Up: PHYS001 Introduction to Previous: PHYS001 Introduction to

Janne Saarela
Mon Apr 3 12:46:29 METDST 1995

	Computation of total cross-section or energy losses	Generation of the final state particles

Processes involving the photon
( $e$ ⁺,e^- ) pair conversion	PHYS 210	PHYS 211
Compton collision	PHYS 220	PHYS 221
Photoelectric effect	PHYS 230	PHYS 231
Photo fission of heavy elements	PHYS 240	PHYS 240
Rayleigh effect	PHYS 250	PHYS 251

Processes involving $e$ ^-/e⁺
Multiple scattering		PHYS 320or 325 or 328
Ionisation and $δ$ -rays production	PHYS 330	PHYS 331or 332
Bremsstrahlung	PHYS 340	PHYS 341
Annihilation of positron	PHYS 350	PHYS 351
Generation of Cerenkov light	PHYS 260	PHYS 260
Synchrotron radiation	PHYS 360

Processes involving $μ$ ^-/ μ⁺
Decay in flight	CONS 310	PHYS 400
Multiple scattering		PHYS 320or 325
Ionisation and $δ$ -rays production	PHYS 430	PHYS 331or 332
Ionisation by heavy ions	PHYS 431
Bremsstrahlung	PHYS 440	PHYS 441
Direct ( $e$ ⁺,e^- ) pair production	PHYS 450	PHYS 451
Nuclear interaction	PHYS 460	PHYS 460
Generation of Cerenkov light	PHYS 260	PHYS 260

Processes involving hadrons
Decay in flight	CONS 310	PHYS 400
Multiple scattering		PHYS 320or 325
Ionisation and $δ$ -rays production	PHYS 430	PHYS 331or 332
Hadronic interactions	PHYS 500 or 510	PHYS 500 or 510
Generation of Cerenkov light	PHYS 260	PHYS 260