GEANT321/gcons/gxsi.F

   1 *
   2 * $Id$
   3 *
   4 * $Log$
   5 * Revision 1.1.1.1  1995/10/24 10:20:18  cernlib
   6 * Geant
   7 *
   8 *
   9 #include "geant321/pilot.h"
  10 *CMZ :  3.21/02 29/03/94  15.41.20  by  S.Giani
  11 *-- Author :
  12       FUNCTION GXSI (Z)
  13 C.
  14 C.    ******************************************************************
  15 C.    *                                                                *
  16 C.    *  COMPUTE SCREENING FACTOR   FOR PAIR PRODUCTION AND BREM       *
  17 C.    *  REFERENCE : EGS MANUAL SLAC 210 - UC32 - JUNE 78              *
  18 C.    *                        FORMULA 2.7.22                          *
  19 C.    *                                                                *
  20 C.    *    ==>Called by : GSMIXT                                       *
  21 C.    *       Author    M.Maire *********                              *
  22 C.    *                                                                *
  23 C.    ******************************************************************
  24 C.
  25       DATA AL183  , AL1440 / 5.20948 , 7.27239 /
  26       ALZ  = LOG(Z)/3.
  27       GXSI  = (AL1440 - 2*ALZ) / (AL183 - ALZ - GFCOUL(Z))
  28       END