CERN Program Library Long Writeup W5013 - CERNLIB ...

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Geant 3.16 GEANT User’s Guide PHYS240 Origin : H.C.Fesefeldt, F.Carminati Submitted: 20.12.85 Revision : Revised: 16.12.93 Documentation : 1 Subroutines Photon-induced fission on heavy materials CALL GPFISI GPFISI computes and stores in the appropriate bank (see JMATE data structure) the value of the photo-fission cross sections as a function of the energy for all the material for which this process is activated and with 230 ≤ A ≤ 240. It is called during initialisation by GPHYSI. CALL GPFIS GPFIS is called by the tracking routine GTGAMA to generate the final state of a photon-induced fission. 2 Method This set of routines generates the photon-induced fission in the nuclei of heavy materials. The code is a straight translation into the GEANT style of the corresponding code from the GHEISHA Monte Carlo program. The information contained in this chapter is mainly taken from the GHEISHA manual to which the user is referred [1]. In fissionable elements the inelastic reaction of photons may be accompanied by the fission of the nucleus. This channel is taken into account only when the nuclear mass is between 230 and 240. The fission cross-section for uranium is tabulated, and for other elements the parameterisation of the A- dependence at 3 MeV neutron energy is used: σ f (3MeV)=−67.0+38.7 Z 4/3 A which implies that the fission may occur only for Z ≥ 90. The fission products are generated in an approximate way. The giant resonance effect is included here as nuclear photoabsorbtion. The photo-fission is activated by the data record PFIS. Secondaries coming from the interaction of the virtual photon with the nucleus will be in the GEANT temporary stack. If IPFIS=2 the secondary particles will not be generated and the energy of the photon will be summed to DESTEP. A table with the photo-fission cross-sections as a function of the energy is put in a bank at initialization time for all the materials with A bigger than 230. See material bank structure for details. 228 PHYS240 – 1
Geant 3.16 GEANT User’s Guide PHYS250 Origin : G.Tromba, P.Bregant Submitted: 10.10.89 Revision : Revised: 16.12.93 Documentation : 1 Subroutines Total cross-section for Rayleigh scattering CALL GRAYLI GRAYLI computes the mean free path, λ, for Rayleigh scattering as a function of the medium and of the energy. It evaluates also an integral of atomic form factors which is used in the routine GRAYL (see [PHYS251]) to sample the scattering angles. GRAYLI is called during initialization by GPHYSI. 2 Method 2.1 Total cross-section An empirical cross-section is used to produce the total cross-section data [12, 33]: σ c (Z, E) =aE 3 + bE 2 + cE + d barn/atom (1) The values of the coefficients are stored in the DATA statement within the routine GRAYLI. For each element the fit was obtained over 27 experimental values of the total coherent cross-section. The accuracy of the fit is estimated to be about ∆σ/σ ≈ 10%, but it is better for most of the elements. 2.2 The atomic form factors Different empirical formulae are used to produce the atomic form factor F(Z,E) data [34]. For Z =1− 3, 91 − 99 the empirical expression is: F (Z, E) =a 1 E 7 + b 1 E 6 + c 1 E 5 + d 1 E 4 + e 1 E 3 + f 1 E 2 + g 1 E + h 1 (2) for Z=100 the formula used is: F (Z, E) =a 2 E 5 + b 2 E 4 + c 2 E 3 + d 2 E 2 + e 2 E + f 2 (3) for the other elements F is calculated as: { a3 E F (Z, E) = 3 + b 3 E 2 + c 3 E + d 3 if E ≤ E c a 4 E 3 + b 4 E 2 (4) + c 4 E + d 4 if E>E c The value of the energy E c depends on Z and it is set in the array ELIM. The values of the coefficients are stored in the DATA statement in the routine GRAYLI. For each element the fits were performed over 97 tabulated values of the form factors. The accuracy of the fit is estimated to about ∆σ/σ = 10% for E ≤ 1 MeV for most of the elements. The integral over the atomic form factors A (E i ) is defined as follows: ∫ Ei ∫ A (E i )=2 |F T (E)| 2 Ei EdE = |F T (E)| 2 dE 2 (5) 0 0 where F T (E) is the total atomic form factor which is function of the energy E. 229 PHYS250 – 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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outines, then you can type the foll
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AAAA Bibliography [1] H.J. Klein an
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2 Event simulation framework The fr
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• after each tracking step along
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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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VALUE = GARNDM (DUMMY) DUMMY (REAL)
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1 Energy binning IDECAD Bin number
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Figure 16: Example of use of GDSPEC
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CALL GDOPEN(3) CALL GDRAWC(’ALEF
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6 NKVIEW IVIEW JDRAW NKVIEW JV = IB
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SHAD EDGE when HIDE is ON, selects
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x1xxxx 1xxxxx add the text EVENT NR
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ECAL SPHE specifications 18/11/93 E
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VALUE = GBRSGM (Z,T,BCUT) Z T BCUT
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VECT,SNEXT,SAFETY Compute distance
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VECT,SNEXT,SAFETY Compute distance
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VECT,SNEXT,SAFETY Compute SFIELD,SM
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SUBROUTINE GUSTEP +SEQ,GCKING,GCVOL
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CALL GRKUTA (CHARGE,STEP,VECT,VOUT*
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YMED R “ Center Y coordinate ”
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This common contains the threshold
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