CERN Program Library Long Writeup W5013 - CERNLIB ...

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CALL GHEISH This is the main steering routine for the hadronic interactions and is a fan-out to the various cascade routines of GHEISHA which treat the particular hadronic interaction. Here the kind of interaction is stored in the INT flag, with the following meaning: INT=0 INT=1 INT=2 INT=3 INT=4 no interaction (NONE); elastic scattering occurs (ECOH); inelastic incoherent interaction occurs (INHE), 1 and 2 include also nuclear reaction processes at very low energies; nuclear fission with inelastic scattering occurs (FISS); neutron nuclear capture occurs (CAPT). After the interaction has been selected, the appropriate cascade routine is called. Upon exit from this there is a check whether the interaction has generated new particles or not. If yes, the new particles are copied in the GEANT temporary stack (GKING). If the particle is a heavy fragment or a proton and it is below the energy cut specified via the CUTS data record, it is not stored in the stack but the kinetic energy is collected. The size of the GHEISHA stack is parametrised, and its limit is currently set to 100 in sequence GCKMAX. The user is left to decide in GUSTEP what to do with the new tracks. This routine is called also in case of a stopping hadron, i.e. with kinetic energy below the GEANT cuts. In this case the routine GHSTOP (see later) is called to handle the stopping hadron. The printing flags for GHEISHA are also set in this routine according to the current value of IDEBUG. This routine must be called by the user routine GUHADR (see above). As explained above, for inorganic scintillators such as the BGO, it is possible to activate a correction to the hadronic cross-section. This is done via the routine GSTPAR in the following way: CALL GSTPAR(ITMED,’GHCOR1’,1.0) The parameter is actually a flag which, if different from 0, triggers the calculation of the cross-section correction, but in view of future developments it is good practice set it to 1.0 when those corrections are required. ITMED is the tracking medium number as used in GSTMED for which corrections are requested. This routine has to be called before GPHYSI. CALL GHSTOP This is an internal routine used to handle stopping particles, called by GHEISH. Here again we have a switch to the various routines handling stopping particles. In particular this routine can lead to nuclear absorption for negative pions and negative kaons (ABSO) and to annihilation for antineutrons, and antiprotons (ANNH). The kinetic energy is completely absorbed, and in the case of an unstable particle, the particle is decayed at rest via the standard GEANT decay routine GDECAY. 322 PHYS510 – 3
Geant 3.16 GEANT User’s Guide PHYS520 Origin : A.Ferrari, K.Lassila-Perini Submitted: 25.10.91 Revision : Revised: 17.12.93 Documentation : K.Lassila-Perini 1 Subroutines The GEANT/FLUKA Interface CALL FLINIT FLINIT initialises the FLUKA variables and reads data from a file (flukaaf.dat) which is automatically opened. FLINIT is called from FLDIST when a hadron enters there first time in the run. CALL FLDIST FLDIST computes the distance to the next interaction point. It calls the FLUKA routines to compute the crosssections for all particles except neutrons with kinetic energy below 20 MeV for which GHEISHA routines are called. FLDIST is called from the user routine GUPHAD where the hadronic package can be chosen. CALL FLUFIN FLUFIN calls the FLUKA routines to generate the hadronic interaction. It passes the particle to FLUKA interaction routines and puts the eventual secondary particles to the GEANT stack. FLUFIN is called from the user routine GUHADR. 2 Method FLUKA [2, 3, 4, 5, 6, 101, 102] is a simulation program which as a standalone code contains transport and the physical processes for hadrons and leptons and tools for geometrical description. In GEANT, only the hadronic interaction part is included. The total cross-section of the hadronic processes is computed by FLUKA routines called from FLDIST (the cross-section for neutrons below 20 MeV is computed in GHEISHA). If hadronic intercation is chosen in GEANT tracking routine, the particle is passed to FLUFIN. If particles are stopping (i.e. their energy is below the cut-off energy), their kinetic energy is deposited. However, if the particle can decay (π + , K ± ) it is forced to decay, or if it is an annihilating particle (π − , ¯n, ¯p), it is sent to FLUKA routines for annihilation. The neutrons with kinetic energy below 20 MeV are passed to GHEISHA. If the particle is not stopping, a sampling is done between elastic and inelastic processes. The cross-sections have been computed in FLDIST in the same time as the total cross-section. The particle is sent correspondingly to the elastic or inelastic interaction routines. After the interaction, the eventual secondary particles are written to GEANT stack. The program flow is shown in figures 46 and 45. When the tracking media is a mixture or a compound material (defined by GSMIXT, see [CONS110]), the atom with which the interaction is taking place is chosen by sampling on the basis of the cross-sections. This is important especially in hydrogenous materials. 323 PHYS520 – 1
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CERN Program Library Long Writeup W
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Chapter 1: Catalog of Geant section
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IOPA500 KINE001 KINE100 KINE199 KIN
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Geant 3.21 GEANT User’s Guide AAA
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The routines made available for GEA
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2 Event simulation framework The fr
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GUDIGI GUOUT GTRIGC UGLAST GLAST GU
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Particles JPART Materials JMATE/JTM
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3 Summary of GEANT data records 3.1
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3.4 User applications KEY N I VAR S
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SUBROUTINE UGEOM + (’TGT ’,2,
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LQ(JHEAD-1) user link IQ(JHEAD+1) I
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