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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:21:56 cernlib | |
6 | * Geant | |
7 | * | |
8 | * | |
9 | #include "geant321/pilot.h" | |
10 | *CMZ : 3.21/02 29/03/94 15.41.48 by S.Giani | |
11 | *-- Author : | |
12 | SUBROUTINE GRNDST(D,LD,KZ1,KZ2,A1,A2,Z1,Z2,ATAR,Q,MT) | |
13 | C THIS ROUTINE CALCULATES THE EXIT ENERGIES AND DIRECTIONAL | |
14 | C COSINES FOR THE CHARGED PARTICLE AND RECOIL NUCLEUS FOR | |
15 | C A GROUND STATE TWO-BODY REACTION USING CLASSICAL KINEMATICS | |
16 | C AND A MOMEMTUM BALANCE. IT ALSO SETS ALL EXIT PARAMETERS FOR | |
17 | C THE COLLISION PRODUCTS AND STORES THEM IN THE RECOIL BANK. | |
18 | #include "geant321/minput.inc" | |
19 | #include "geant321/mconst.inc" | |
20 | #include "geant321/mnutrn.inc" | |
21 | #include "geant321/mrecoi.inc" | |
22 | #include "geant321/mapoll.inc" | |
23 | #include "geant321/mmass.inc" | |
24 | #include "geant321/mpstor.inc" | |
25 | DIMENSION D(*),LD(*) | |
26 | SAVE | |
27 | NPN = 1 | |
28 | IF(MT.EQ.108) NPN = 2 | |
29 | IF(MT.EQ.109) NPN = 3 | |
30 | IF(MT.EQ.111) NPN = 2 | |
31 | C CALCULATE THE CONSTANTS USED IN THE KINEMATIIC EQUATIONS | |
32 | ZATAR=ATAR*9.31075E+08 | |
33 | PXO = 0.0 | |
34 | PYO = 0.0 | |
35 | PZO = 0.0 | |
36 | C loop over emmited particles | |
37 | DO 40 NP=1,NPN | |
38 | C ASSUME ISOTROPIC CHARGED PARTICLE EMISSION IN THE CENTER | |
39 | C OF MASS COORDINATE SYSTEM | |
40 | R=FLTRNF(0) | |
41 | FM=2.0*R-1.0 | |
42 | C FOR A GROUND STATE REACTION THE RECOIL MASS IS KNOWN EXACTLY | |
43 | Z2=ZN+ZATAR-FLOAT(NP)*Z1-Q | |
44 | A2=Z2/9.31075E+08 | |
45 | DENOM=(AN+ATAR)*(A1*FLOAT(NP)+A2) | |
46 | ERATIO=EOLD/(EOLD+Q) | |
47 | AC=((AN*A2)/DENOM)*ERATIO | |
48 | BC=((AN*A1)/DENOM)*ERATIO | |
49 | CC=((ATAR*A1)/DENOM)*(1.0+(AN*Q)/(ATAR*(EOLD+Q))) | |
50 | DC=((ATAR*A2)/DENOM)*(1.0+(AN*Q)/(ATAR*(EOLD+Q))) | |
51 | C CALCULATE THE CHARGED PARTICLE AND RECOIL NUCLEUS IN THE | |
52 | C LABORATORY COORDINATE SYSTEM | |
53 | E1=(EOLD+Q)*(BC+DC+(2.0*SQRT(AC*CC))*FM) | |
54 | E2=(EOLD+Q)*(AC+CC-(2.0*SQRT(AC*CC))*FM) | |
55 | C CALCULATE THE CHARGED PARTICLE ENERGY AND VELOCITY IN THE | |
56 | C CENTER OF MASS COORDINATE SYSTEM | |
57 | E1CM=(Z2/(Z1+Z2))*((ZATAR/(ZN+ZATAR))*EOLD+Q) | |
58 | V1CM=SQRT((2.0*E1CM)/Z1) | |
59 | C CALCULATE THE VELOCITY OF THE CENTER OF MASS | |
60 | VCM=SQRT(2.0*ZN*EOLD)/(ZN+ZATAR) | |
61 | C CONVERT THE COSINE OF THE SCATTERING ANGLE IN THE CENTER OF | |
62 | C MASS COORDINATE SYSTEM TO THE LABORATORY COORDINATE SYSTEM | |
63 | FM=(V1CM*FM+VCM)/(SQRT(((V1CM*FM+VCM)**2)+ ((V1CM*(1.0-FM**2)) | |
64 | + **2))) | |
65 | C CALCULATE THE CHARGED PARTICLE EXIT DIRECTIONAL COSINES | |
66 | SINPSI=SQRT(1.0-FM**2) | |
67 | CALL AZIRN(SINETA,COSETA) | |
68 | STHETA=1.0-UOLD**2 | |
69 | IF(STHETA)20,20,10 | |
70 | 10 STHETA=SQRT(STHETA) | |
71 | COSPHI=VOLD/STHETA | |
72 | SINPHI=WOLD/STHETA | |
73 | GO TO 30 | |
74 | 20 COSPHI=1.0 | |
75 | SINPHI=0.0 | |
76 | STHETA=0.0 | |
77 | 30 U1=UOLD*FM-COSETA*SINPSI*STHETA | |
78 | V1=VOLD*FM+UOLD*COSPHI*COSETA*SINPSI-SINPHI*SINPSI*SINETA | |
79 | W1=WOLD*FM+UOLD*SINPHI*COSETA*SINPSI+COSPHI*SINPSI*SINETA | |
80 | S=1.0/SQRT(U1**2+V1**2+W1**2) | |
81 | U1=U1*S | |
82 | V1=V1*S | |
83 | W1=W1*S | |
84 | PPO = SQRT(2.0*Z1*E1) | |
85 | PXO = PXO + U1*PPO | |
86 | PYO = PYO + V1*PPO | |
87 | PZO = PZO + W1*PPO | |
88 | C CALCULATE AND SET THE CHARGED PARTICLE EXIT PARAMETERS | |
89 | XR=X | |
90 | YR=Y | |
91 | ZR=Z | |
92 | WATER=WTBC | |
93 | NZR=KZ1 | |
94 | AGER=AGE | |
95 | NCOLR=NCOL | |
96 | MTNR=MT | |
97 | AR=A1 | |
98 | ENIR=EOLD | |
99 | UNIR=UOLD | |
100 | VNIR=VOLD | |
101 | WNIR=WOLD | |
102 | ENOR=0.0 | |
103 | UNOR=0.0 | |
104 | VNOR=0.0 | |
105 | WNOR=0.0 | |
106 | WTNR=0.0 | |
107 | QR=Q | |
108 | UR=U1 | |
109 | VR=V1 | |
110 | WR=W1 | |
111 | ER=E1 | |
112 | C STORE THE CHARGED PARTICLE IN THE RECOIL BANK | |
113 | EP = ER | |
114 | UP = UR | |
115 | VP = VR | |
116 | WP = WR | |
117 | AMP = AR | |
118 | ZMP = FLOAT(NZR) | |
119 | AGEP = AGE | |
120 | MTP = MT | |
121 | CALL STOPAR(IDHEVY,NHEVY) | |
122 | 40 CONTINUE | |
123 | C CALCULATE THE TOTAL MOMENTUM BEFORE THE COLLISION | |
124 | C NEUTRON MOMENTUM BEFORE COLLISION (PI) EQUALS TOTAL MOMENTUM | |
125 | PI=SQRT(2.0*ZN*EOLD) | |
126 | C CALCULATE THE DIRECTIONAL MOMENTUM OF THE RECOIL NUCLEUS | |
127 | PRX=PI*UOLD-PXO | |
128 | PRY=PI*VOLD-PYO | |
129 | PRZ=PI*WOLD-PZO | |
130 | C CALCULATE THE TOTAL MOMENTUM OF THE RECOIL NUCLEUS | |
131 | PR=SQRT(PRX**2+PRY**2+PRZ**2) | |
132 | C CALCULATE THE RECOIL NUCLEUS DIRECTIONAL COSINES | |
133 | U2=PRX/PR | |
134 | V2=PRY/PR | |
135 | W2=PRZ/PR | |
136 | C CALCULATE THE RECOIL NUCLEUS EXIT ENERGY | |
137 | XM = A2 * 931.075E6 | |
138 | E2 = SQRT(PR**2+XM**2) - XM | |
139 | C CALCULATE AND SET THE CHARGED PARTICLE EXIT PARAMETERS | |
140 | XR=X | |
141 | YR=Y | |
142 | ZR=Z | |
143 | WATER=WTBC | |
144 | NZR=KZ2 | |
145 | AGER=AGE | |
146 | NCOLR=NCOL | |
147 | MTNR=MT | |
148 | AR=A2 | |
149 | ENIR=EOLD | |
150 | UNIR=UOLD | |
151 | VNIR=VOLD | |
152 | WNIR=WOLD | |
153 | ENOR=0.0 | |
154 | UNOR=0.0 | |
155 | VNOR=0.0 | |
156 | WNOR=0.0 | |
157 | WTNR=0.0 | |
158 | QR=Q | |
159 | UR=U2 | |
160 | VR=V2 | |
161 | WR=W2 | |
162 | ER=E2 | |
163 | C STORE THE RECOIL HEAVY ION IN THE RECOIL BANK | |
164 | EP = ER | |
165 | UP = UR | |
166 | VP = VR | |
167 | WP = WR | |
168 | AMP = AR | |
169 | ZMP = FLOAT(NZR) | |
170 | AGEP = AGE | |
171 | MTP = MT | |
172 | CALL STOPAR(IDHEVY,NHEVY) | |
173 | RETURN | |
174 | END |