CERN Program Library Long Writeup W5013 - CERNLIB ...

* CUTGAM=100.00 keV CUTELE=100.00 keV CUTNEU=100.00 keV *
* CUTHAD=100.00 keV CUTMUO= 1.00 MeV *
* BCUTE =100.00 keV BCUTM =100.00 keV *
* DCUTE =100.00 keV DCUTM =100.00 keV PPCUTM= 10.00 MeV *
* IPAIR = 1. ICOMP = 1. IPHOT = 1. *
* IPFIS = 1. IDRAY = 1. IANNI = 1. *
* IBREM = 1. IHADR = 1. IMUNU = 1. *
* IDCAY = 1. ILOSS = 1. IMULS = 1. *
* IRAYL = 0. ILABS = 0. ISYNC = 0. *
* ISTRA = 0. *
* *
* *
* Special TPAR for TMED 5 GAS *
* ------------------------- *
* CUTGAM=100.00 keV CUTELE=100.00 keV CUTNEU=100.00 keV *
* CUTHAD=100.00 keV CUTMUO= 1.00 MeV *
* BCUTE =100.00 keV BCUTM =100.00 keV *
* DCUTE = 10.00 GeV DCUTM =100.00 keV PPCUTM= 10.00 MeV *
* IPAIR = 1. ICOMP = 1. IPHOT = 1. *
* IPFIS = 1. IDRAY = 1. IANNI = 1. *
* IBREM = 1. IHADR = 1. IMUNU = 1. *
* IDCAY = 1. ILOSS = 1. IMULS = 1. *
* IRAYL = 0. ILABS = 0. ISYNC = 0. *
* ISTRA = 1. *
* *
* *
************************************************************
The meaning of the printed values is described in the documentation of the commons /GCCUTS/ and
/GCPHYS/ in [BASE030]. Different values of the parameters can be assigned by the user to each tracking
medium (see [BASE100]). The parameter definition in GEANT proceeds as follows:
1. a default set of global values of the parameters is defined for all tracking media by the routine GINIT;
2. the default values can be changed by the user via the data records read by the routine GFFGO. A
summary of all valid data records is given in [BASE040];
3. after having defined tracking media and materials, the user can redefine the parameters for each
medium via the routine GSTPAR [CONS210];
4. if the data structures are read from an external file (see IOPA section), all the parameters are taken
from this file. In this case the user can still modify them, but this should be done before calling the
routine GPHYSI.
2 Compute cross-section and energy loss tables
GPHYSI is the steering routine to compute the cross-section and energy loss tables for all materials used as
tracking media. GPHYSI builds and fills the JMATE data structure described in [CONS199]. Here, we give
the flow chart of this process. The description of the specialised routines can be found in the rest of the
section PHYS.
Note: if several tracking media are using the same material (for instance a calorimeter and a chamber support
can be both in steel) the energy cuts must be the same. If this is not possible, the user must define materials
with different numbers.
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