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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:21:33 cernlib | |
6 | * Geant | |
7 | * | |
8 | * | |
9 | #include "geant321/pilot.h" | |
10 | *CMZ : 3.21/02 29/03/94 15.41.23 by S.Giani | |
11 | *-- Author : | |
12 | SUBROUTINE GPROBI | |
13 | C. | |
14 | C. ****************************************************************** | |
15 | C. * * | |
16 | C. * Initialise material constants used in the computation of * | |
17 | C. * the probability for various interactions. * | |
18 | C. * * | |
19 | C. * ==>Called by : GPHYSI * | |
20 | C. * Authors R.Brun, G.Patrick, L.Urban ********* * | |
21 | C. * * | |
22 | C. ****************************************************************** | |
23 | C. | |
24 | #include "geant321/gcbank.inc" | |
25 | #include "geant321/gconsp.inc" | |
26 | #include "geant321/gcmate.inc" | |
27 | #include "geant321/gcjloc.inc" | |
28 | DIMENSION EK(4),EL1(4),EL2(4) | |
29 | DATA EK / 0.66644E-8 , 0.22077E-9 ,-0.32552E-11, 0.18199E-13/ | |
30 | DATA EL1/-0.29179E-9 , 0.87983E-10,-0.12589E-11, 0.69602E-14/ | |
31 | DATA EL2/-0.68606E-9 , 0.10078E-9 ,-0.14496E-11, 0.78809E-14/ | |
32 | DATA ALFA/7.29735E-3/ | |
33 | DATA REL/0.2817938/ | |
34 | C. | |
35 | C. ------------------------------------------------------------------ | |
36 | C. | |
37 | IF(Z.LT.1.) GOTO 999 | |
38 | AEFF=A | |
39 | JPROB = LQ(JMA-4) | |
40 | IF(JMIXT.GT.0)THEN | |
41 | JMI1=LQ(JMIXT-1) | |
42 | AEFF=Q(JMI1+1) | |
43 | ENDIF | |
44 | C | |
45 | C store constants for PAIR/BREMS routines | |
46 | C | |
47 | X = (Z*ALFA)**2 | |
48 | FC = (( - 0.002 * X + 0.0083) * X - 0.0369) * X + 0.20206 | |
49 | FC = X * (FC + 1. / (1. + X)) | |
50 | C1=Z**0.333333 | |
51 | C2=LOG(C1) | |
52 | C3=LOG(183./C1)-FC | |
53 | C4=LOG(1440./(C1*C1))/C3 | |
54 | Q(JPROB+1)=Z*(Z+C4)*C3/A | |
55 | Q(JPROB+2)=C1 | |
56 | Q(JPROB+3)=C2 | |
57 | Q(JPROB+4)=FC | |
58 | C | |
59 | C constants for PHOTOEFFECT | |
60 | C | |
61 | Z2 = Z*Z | |
62 | EKZ = Z2*(EK(1) +Z*(EK(2) +Z*(EK(3) +Z*EK(4)))) | |
63 | EL1Z = Z2*(EL1(1)+Z*(EL1(2)+Z*(EL1(3)+Z*EL1(4)))) | |
64 | EL2Z = Z2*(EL2(1)+Z*(EL2(2)+Z*(EL2(3)+Z*EL2(4)))) | |
65 | Q(JPROB+5)=EKZ | |
66 | Q(JPROB+6)=EL1Z | |
67 | Q(JPROB+7)=EL2Z | |
68 | C | |
69 | C Constants for Hadronic interactions | |
70 | C | |
71 | Q(JPROB+8)= 1000.*AEFF/(AVO*DENS) | |
72 | C | |
73 | C Constants for electron/positron ionisation losses | |
74 | C and S5 for one-photon annihilation | |
75 | C | |
76 | IF(JMIXT.LE.0)THEN | |
77 | POTI=16.E-9*Z**0.9 | |
78 | S1=Z/A | |
79 | S5=Z**5/A*ALFA**4 | |
80 | ELSE | |
81 | NLMAT=Q(JMA+11) | |
82 | NLM=IABS(NLMAT) | |
83 | S1=0. | |
84 | S2=0. | |
85 | S5=0. | |
86 | DO 10 J=1,NLM | |
87 | AJ=Q(JMIXT+J) | |
88 | ZJ=Q(JMIXT+NLM+J) | |
89 | WJ=Q(JMIXT+2*NLM+J) | |
90 | S1=S1+WJ*ZJ/AJ | |
91 | S2=S2+WJ*ZJ*LOG(ZJ)/AJ | |
92 | S5=S5+WJ*ZJ**5/AJ*ALFA**4 | |
93 | 10 CONTINUE | |
94 | POTI=16.E-9*EXP(0.9*S2/S1) | |
95 | ENDIF | |
96 | Q(JPROB+9) = POTI | |
97 | Q(JPROB+10) = LOG(POTI) | |
98 | C | |
99 | CON1=LOG(POTI/EMASS) | |
100 | CON2=DENS*S1 | |
101 | CON3=1.+2.*LOG(POTI/(28.8E-9*SQRT(CON2))) | |
102 | C | |
103 | C Condensed material ? | |
104 | C (at present that means: DENS.GT.0.05 g/cm**3) | |
105 | C | |
106 | IF(DENS.GT.0.05)THEN | |
107 | IF(POTI.LT.1.E-7)THEN | |
108 | IF(CON3.LT.3.681)THEN | |
109 | CON4=0.2 | |
110 | ELSE | |
111 | CON4=0.326*CON3-1. | |
112 | ENDIF | |
113 | CON5=2. | |
114 | ELSE | |
115 | IF(CON3.LT.5.215)THEN | |
116 | CON4=0.2 | |
117 | ELSE | |
118 | CON4=0.326*CON3-1.5 | |
119 | ENDIF | |
120 | CON5=3. | |
121 | ENDIF | |
122 | ELSE | |
123 | C | |
124 | C Gas (T=0 C, P= 1 ATM) | |
125 | C if T.NE. 0 C and/or P.NE. 1 ATM | |
126 | C you have to modify the variable X | |
127 | C X=>X+0.5*LOG((273+T C)/(273*P ATM)) | |
128 | C in the function GDRELE | |
129 | C ------------------------ | |
130 | C | |
131 | IF(CON3.LE.12.25)THEN | |
132 | IP=INT((CON3-10.)/0.5)+1 | |
133 | IF(IP.LT.0) IP=0 | |
134 | IF(IP.GT.4) IP=4 | |
135 | CON4=1.6+0.1*FLOAT(IP) | |
136 | CON5=4. | |
137 | ELSE | |
138 | IF(CON3.LE.13.804)THEN | |
139 | CON4=2. | |
140 | CON5=5. | |
141 | ELSE | |
142 | CON4=0.326*CON3-2.5 | |
143 | CON5=5. | |
144 | ENDIF | |
145 | ENDIF | |
146 | ENDIF | |
147 | C | |
148 | XA=CON3/4.606 | |
149 | CON6=4.606*(XA-CON4)/(CON5-CON4)**3. | |
150 | Q(JPROB+11)=CON1 | |
151 | Q(JPROB+12)=CON2 | |
152 | Q(JPROB+13)=-CON3 | |
153 | Q(JPROB+14)=CON4 | |
154 | Q(JPROB+15)=CON5 | |
155 | Q(JPROB+16)=CON6 | |
156 | C | |
157 | C constant for delta rays | |
158 | C (the same constant is used in the Compton | |
159 | C and Annihilation subroutines ) | |
160 | C and for one-photon annihilation | |
161 | C | |
162 | Q(JPROB+17)=AVO*TWOPI*REL*REL*DENS*S1 | |
163 | Q(JPROB+18)=AVO*TWOPI*REL*REL*DENS*S5 | |
164 | C | |
165 | C Constants for Moliere scattering | |
166 | C | |
167 | IF(JMIXT.LE.0)THEN | |
168 | CALL GMOLI(A,Z,1.,1,DENS,Q(JPROB+21),Q(JPROB+25)) | |
169 | ELSE | |
170 | CALL GMOLI(Q(JMIXT+1),Q(JMIXT+NLM+1),Q(JMIXT+2*NLM+1), | |
171 | + NLM,DENS,Q(JPROB+21),Q(JPROB+25)) | |
172 | ENDIF | |
173 | C | |
174 | C Constants for muon bremsstrahlung | |
175 | C | |
176 | Q(JPROB+31)=LOG(189.*EMMU/(EMASS*C1)) | |
177 | IF(Z.GT.10)Q(JPROB+31)=Q(JPROB+31)+LOG(0.666666/C1) | |
178 | SE =SQRT(2.71828) | |
179 | Q(JPROB+32)=189.*SE*EMMU*EMMU/(2.*EMASS*C1) | |
180 | Q(JPROB+33)=0.75*SE*EMMU*C1 | |
181 | C | |
182 | 999 END |