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[u/mrichter/AliRoot.git] / GEANT321 / gphys / gmoli2.F
1 *
2 * $Id$
3 *
4 * $Log$
5 * Revision 1.1.1.1  1995/10/24 10:21:27  cernlib
6 * Geant
7 *
8 *
9 #include "geant321/pilot.h"
10 #if defined(CERNLIB_VER314)
11 *CMZ :  3.21/02 29/03/94  15.41.22  by  S.Giani
12 *-- Author :
13       SUBROUTINE GMOLI2(AC,ZC,WMAT,NLM,DENS,BETA2,OMC)
14 C.
15 C.    ******************************************************************
16 C.    *                                                                *
17 C.    *     Initializes material constants OMC,CHC for Moliere         *
18 C.    *     scattering.                                                *
19 C.    *                                                                *
20 C.    * WMAT=proportion by weight of NLM  individual constituents of   *
21 C.    *      charge ZC and atomic weight AC for the mixture/compound   *
22 C.    * DENS=density in gm/cm**3                                       *
23 C.    *                                                                *
24 C.    *    ==>Called by : GMULOF                                       *
25 C.    *         Author M.S. Dixit NRCC Ottawa    *********             *
26 C.    *                                                                *
27 C.    ******************************************************************
28 C.
29 C     ZETA=factor for scattering by atomic electrons
30 C
31       DIMENSION WMAT(1),AC(1),ZC(1)
32       DATA ZETA / 1. /
33 *
34 *     ------------------------------------------------------------------
35 *
36       ZS=0.
37       ZE=0.
38       ZX=0.
39       DO 15 I=1,NLM
40          TMP=(WMAT(I)/AC(I))*ZC(I)*(ZC(I)+ZETA)
41          ZS=ZS+TMP
42          ZE=ZE-0.66666*TMP*LOG(ZC(I))
43          ZX=ZX+TMP*LOG(1.+3.34*(ZC(I)/(BETA2*137.036))**2)
44 15    CONTINUE
45       OMC=6702.33*ZS*DENS*EXP((ZE-ZX)/ZS)
46 *
47       END
48  
49 #endif