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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:21:21 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 | SUBROUTINE GANNI2 | |
13 | C. | |
14 | C. ****************************************************************** | |
15 | C. * * | |
16 | C. * Generates positron annihilation at rest * | |
17 | C. * (alias of GANNIR , directly called from GPAIRG) * | |
18 | C. * * | |
19 | C. * ==>Called by : GPAIRG,GPAIRM * | |
20 | C. * Author M.Maire ********* * | |
21 | C. * * | |
22 | C. ****************************************************************** | |
23 | C. | |
24 | #include "geant321/gcphys.inc" | |
25 | #include "geant321/gctrak.inc" | |
26 | #include "geant321/gcking.inc" | |
27 | #include "geant321/gccuts.inc" | |
28 | #include "geant321/gconsp.inc" | |
29 | DIMENSION RNDM(2) | |
30 | C. | |
31 | KCASE = NAMEC(11) | |
32 | IF((IANNI.NE.1).OR.(EMASS.LE.CUTGAM)) THEN | |
33 | DESTEP = DESTEP + 2*EMASS | |
34 | GO TO 999 | |
35 | ENDIF | |
36 | CALL GRNDM(RNDM,2) | |
37 | CT=-1.+2.*RNDM(1) | |
38 | ST=SQRT((1.-CT)*(1.+CT)) | |
39 | PHI=TWOPI*RNDM(2) | |
40 | NGKINE=NGKINE+1 | |
41 | GKIN(1,NGKINE)=EMASS*ST*COS(PHI) | |
42 | GKIN(2,NGKINE)=EMASS*ST*SIN(PHI) | |
43 | GKIN(3,NGKINE)=EMASS*CT | |
44 | GKIN(4,NGKINE)=EMASS | |
45 | GKIN(5,NGKINE)=1. | |
46 | TOFD(NGKINE)=0. | |
47 | GPOS(1,NGKINE) = VECT(1) | |
48 | GPOS(2,NGKINE) = VECT(2) | |
49 | GPOS(3,NGKINE) = VECT(3) | |
50 | NGKINE=NGKINE+1 | |
51 | DO 10 J=1,3 | |
52 | 10 GKIN(J,NGKINE)=-GKIN(J,NGKINE-1) | |
53 | GKIN(4,NGKINE)=EMASS | |
54 | GKIN(5,NGKINE)=1. | |
55 | TOFD(NGKINE)=0. | |
56 | GPOS(1,NGKINE) = VECT(1) | |
57 | GPOS(2,NGKINE) = VECT(2) | |
58 | GPOS(3,NGKINE) = VECT(3) | |
59 | C | |
60 | 999 END |