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Subroutines

CALL GBRELA GBRELA fills the tables for continuous energy loss of electrons, positrons and muons due to bremsstrahlung during initialisation time. The energy binning is determined by the array ELOW (common /CGMULO/) in the routine GPHYSI. In the tables, the $dE/dx$ due to bremsstrahlung is summed with that due to the ionisation. For energy loss of muons, GBRELA calls the function GDRELM. The following pointers are used:

JMA = LQ(JMATE-I): pointer to the $I$ ^th material;
JEL1 = LQ(JMA-1): pointer to dE/dx for electrons;
JEL1+NEK1: pointer to dE/dx for positrons;
JEL2 = LQ(JMA-2): pointer to dE/dx for electrons.

GBRELA is called by GPHYSI. GBRELMVALUE = GBRELM(Z,T,BCUT)

Z: ( REAL) atomic number of the material;
T: ( REAL) kinetic energy of the muon;
BCUT: ( REAL) soft bremsstrahlung cut.

GBRELM calculates the muon energy loss due to bremsstrahlung of photons with energy below BCUT, (variable BCUTM in the common /GCCUTS/). Above this value, the bremsstrahlung process is simulated explicitly (see [PHYS441]) and the energy lost by the muons is not included in the tables. In the tables, the

dE/dx

due to bremsstrahlung is summed with the energy lost coming from ionisation, pair production and nuclear interaction. GBRELM is called by GBRELA. CALL GBRSGA GBRSGA calculates the total cross-section for bremsstrahlung. It tabulates the mean free path in cm as a function of the medium and the energy. The energy binning is determined by the array ELOW (common /CGMULO/). The following pointers are used:

JMA = LQ(JMATE-I): pointer to the $I$ ^th material;
JBREM = LQ(JMA-9): pointer to bremsstrahlung cross-sections;
JBREM: pointer for ;
JBREM+NEK1: pointer for ;
JBREM+2*NEK1: pointer for $μ$ ⁺/μ^- .

GBRSGA is called during initialisation by GPHYSI. GBRSGMVALUE = GBRSGM(Z,T,BCUT)

Z: ( REAL) atomic number of the materian;
T: ( REAL) kinetic energy of the muon;
BCUT: ( REAL) soft bremsstrahlung cut.

GBRSGM calculates the total bremsstrahlung cross-section for muons when the emitted photon has an energy greater than BCUT, (variable BCUTM in the common /GCCUTS/). It is called by GBRSGA.

Next: Method Up: PHYS440 Total cross-section Previous: PHYS440 Total cross-section

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