GEANT321/gphys/gbrelm.F

   1 *
   2 * $Id$
   3 *
   4 * $Log$
   5 * Revision 1.1.1.1  1995/10/24 10:21:22  cernlib
   6 * Geant
   7 *
   8 *
   9 #include "geant321/pilot.h"
  10 *CMZ :  3.21/02 29/03/94  15.41.21  by  S.Giani
  11 *-- Author :
  12       FUNCTION GBRELM(Z,T,BCUT)
  13 C.
  14 C.    ******************************************************************
  15 C.    *                                                                *
  16 C.    *  To calculate energy loss due to soft muon BREMSSTRAHLUNG.     *
  17 C.    *                                                                *
  18 C.    *    ==>Called by : GBRELA                                       *
  19 C.    *       Author  L.Urban  *********                               *
  20 C.    *                                                                *
  21 C.    ******************************************************************
  22 C.
  23 #include "geant321/gconsp.inc"
  24       DIMENSION C(52),D(28)
  25       DATA C/0.615548E-07,-0.858333E-07, 0.148015E-06,-0.220289E-07
  26      +      , 0.162987E-08,-0.305945E-10, 0.170957E-06,-0.272156E-06
  27      +      , 0.610418E-07,-0.768052E-08, 0.391729E-09,-0.104624E-10
  28      +      , 0.412993E-07,-0.373362E-08,-0.110920E-08, 0.571124E-09
  29      +      ,-0.477538E-10, 0.169448E-11, 0.323774E-08,-0.305497E-08
  30      +      , 0.758138E-09,-0.121885E-09, 0.857707E-11,-0.253742E-12
  31      +      , 0.133703E-08,-0.676756E-09, 0.147782E-09,-0.136039E-10
  32      +      , 0.556182E-12,-0.634277E-14, 0.847418E-10,-0.288608E-10
  33      +      , 0.224661E-11, 0.514422E-13,-0.122288E-13, 0.333673E-15
  34      +      ,-0.153886E-08, 0.100179E-08,-0.149457E-09, 0.734506E-11
  35      +      ,-0.507324E-09, 0.146362E-09,-0.126608E-10, 0.778818E-13
  36      +      ,-0.161333E-10,-0.199252E-11, 0.100270E-11,-0.347404E-13
  37      +      ,-0.465077E-11, 0.121078E-11,-0.131113E-12, 0.431515E-14/
  38       DATA D/-0.389616E-05,-0.130106E-09, 0.101380E-04, 0.259032E-07
  39      +      ,-0.816804E-07,-0.961867E-05,-0.603907E-08, 0.192015E-07
  40      +      , 0.772670E-08, 0.459337E-05, 0.761272E-09,-0.251956E-08
  41      +      , 0.483037E-10,-0.289802E-08,-0.117497E-05,-0.484372E-10
  42      +      , 0.155476E-09,-0.218604E-10, 0.812047E-10, 0.380265E-09
  43      +      , 0.154338E-06, 0.118357E-11,-0.367778E-11, 0.119199E-11
  44      +      ,-0.273719E-11,-0.201239E-11,-0.221931E-10,-0.818793E-08/
  45 C
  46       DATA AKSI,BETA,DEL/2.20,1.24,0.58/
  47 C
  48       DATA CONMX/0.130653/
  49 C        CONMX=0.75*SQRT(2.7182...)*EMMU
  50 C.
  51 C.    ------------------------------------------------------------------
  52 C.
  53       GBRELM=0.
  54       IF(BCUT.LE.0.) GOTO 99
  55 C
  56       Z3=Z**0.333333
  57       E=T+EMMU
  58       ECMAX=E-CONMX*Z3
  59       X=LOG(E/EMMU)
  60       IF(BCUT.GE.ECMAX) GOTO 60
  61 C
  62       Y=LOG(BCUT/EMMU)
  63       S=0.
  64       YY=1.
  65       DO 30 I=1,6
  66          XX=1.
  67          DO 20 J=1,6
  68             K=6*I+J-6
  69             S=S+C(K)*XX*YY
  70             XX=XX*X
  71   20     CONTINUE
  72          YY=YY*Y
  73   30  CONTINUE
  74       SS=0.
  75       YY=1.
  76       DO 50 I=1,4
  77          XX=1.
  78          DO 40 J=1,4
  79             K=4*I+J+32
  80             SS=SS+C(K)*XX*YY
  81             XX=XX*X
  82   40     CONTINUE
  83          YY=YY*Y
  84   50  CONTINUE
  85       S=S+Z*SS
  86       IF(S.LE.0.) GOTO 99
  87 C
  88       FAC=E*(BCUT/E)**BETA
  89       FAC=Z*(Z+AKSI*(1.+DEL*LOG(Z)))*FAC
  90       GBRELM=FAC*S
  91       GOTO 99
  92 C
  93   60  Y=Z3
  94       S=D(1)
  95       K=1
  96       XX=1.
  97       YPX=Y/X
  98       DO 80 I=1,6
  99          II=I+1
 100          XX=XX*X
 101          XXYY=XX
 102          DO 70 J=1,II
 103             K=K+1
 104             S=S+D(K)*XXYY
 105             XXYY=XXYY*YPX
 106   70     CONTINUE
 107   80  CONTINUE
 108       IF(S.LE.0.) GOTO 99
 109 C
 110       FAC=Z*(Z+1.)*ECMAX
 111       IF(FAC.LE.0.) GOTO 99
 112       GBRELM=FAC*S
 113 C
 114   99  RETURN
 115       END