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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:21:00 cernlib | |
6 | * Geant | |
7 | * | |
8 | * | |
9 | #include "geant321/pilot.h" | |
10 | *CMZ : 3.21/02 29/03/94 15.41.38 by S.Giani | |
11 | *-- Author : | |
12 | SUBROUTINE CASN(K,INT,NFL) | |
13 | C | |
14 | C *** CASCADE OF NEUTRON *** | |
15 | C *** NVE 04-MAY-1988 CERN GENEVA *** | |
16 | C | |
17 | C ORIGIN : H.FESEFELDT (13-SEP-1987) | |
18 | C | |
19 | C N UNDERGOES INTERACTION WITH NUCLEON WITHIN NUCLEUS. | |
20 | C CHECK IF ENERGETICALLY POSSIBLE TO PRODUCE PIONS/KAONS. | |
21 | C IF NOT ASSUME NUCLEAR EXCITATION OCCURS AND INPUT PARTICLE | |
22 | C IS DEGRADED IN ENERGY. NO OTHER PARTICLES PRODUCED. | |
23 | C IF REACTION IS POSSIBLE FIND CORRECT NUMBER OF PIONS/PROTONS/ | |
24 | C NEUTRONS PRODUCED USING AN INTERPOLATION TO MULTIPLICITY DATA. | |
25 | C REPLACE SOME PIONS OR PROTONS/NEUTRONS BY KAONS OR STRANGE BARYONS | |
26 | C ACCORDING TO AVERAGE MULTIPLICITY PER INELASTIC REACTIONS. | |
27 | C | |
28 | #include "geant321/mxgkgh.inc" | |
29 | #include "geant321/s_consts.inc" | |
30 | #include "geant321/s_curpar.inc" | |
31 | #include "geant321/s_result.inc" | |
32 | #include "geant321/s_prntfl.inc" | |
33 | #include "geant321/limits.inc" | |
34 | #include "geant321/s_kginit.inc" | |
35 | C | |
36 | REAL N | |
37 | DIMENSION PMUL(2,1200),ANORM(2,60),SUPP(10),CECH(10),B(2) | |
38 | DIMENSION RNDM(1) | |
39 | SAVE PMUL,ANORM | |
40 | DATA SUPP/0.,0.4,0.55,0.65,0.75,0.82,0.86,0.90,0.94,0.98/ | |
41 | DATA CECH/0.50,0.45,0.40,0.35,0.30,0.25,0.06,0.04,0.005,0./ | |
42 | DATA B/0.35,0.0/,C/1.25/ | |
43 | C | |
44 | C --- INITIALIZATION INDICATED BY KGINIT(17) --- | |
45 | IF (KGINIT(17) .NE. 0) GO TO 10 | |
46 | KGINIT(17)=1 | |
47 | C | |
48 | C --- INITIALIZE PMUL AND ANORM ARRAYS --- | |
49 | DO 9000 J=1,1200 | |
50 | DO 9001 I=1,2 | |
51 | PMUL(I,J)=0.0 | |
52 | IF (J .LE. 60) ANORM(I,J)=0.0 | |
53 | 9001 CONTINUE | |
54 | 9000 CONTINUE | |
55 | C | |
56 | C** COMPUTE NORMALIZATION CONSTANTS | |
57 | C** FOR N AS TARGET | |
58 | C | |
59 | L=0 | |
60 | DO 1 NP1=1,20 | |
61 | NP=NP1-1 | |
62 | NPP1=NP1+2 | |
63 | DO 1 NM1=NP1,NPP1 | |
64 | NM=NM1-1 | |
65 | DO 1 NZ1=1,20 | |
66 | NZ=NZ1-1 | |
67 | L=L+1 | |
68 | IF(L.GT.1200) GOTO 1 | |
69 | NPROT= -NP+NM | |
70 | NNEUT=2-NPROT | |
71 | NT=NP+NM+NZ | |
72 | IF(NT.LE.0.OR.NT.GT.60) GOTO 1 | |
73 | PMUL(1,L)=PMLTPC(NP,NM,NZ,NT,B(2),C) | |
74 | NPROTF=NFAC(NPROT) | |
75 | NNEUTF=NFAC(NNEUT) | |
76 | PMUL(1,L)=PMUL(1,L)/(NPROTF*NNEUTF) | |
77 | ANORM(1,NT)=ANORM(1,NT)+PMUL(1,L) | |
78 | 1 CONTINUE | |
79 | C** FOR P AS TARGET | |
80 | L=0 | |
81 | DO 2 NP1=1,20 | |
82 | NP=NP1-1 | |
83 | NMM1=NP1-1 | |
84 | IF(NMM1.LE.1) NMM1=1 | |
85 | NPP1=NP1+1 | |
86 | DO 2 NM1=NMM1,NPP1 | |
87 | NM=NM1-1 | |
88 | DO 2 NZ1=1,20 | |
89 | NZ=NZ1-1 | |
90 | L=L+1 | |
91 | IF(L.GT.1200) GOTO 2 | |
92 | NPROT=1-NP+NM | |
93 | NNEUT=2-NPROT | |
94 | NT=NP+NM+NZ | |
95 | IF(NT.LE.0.OR.NT.GT.60) GOTO 2 | |
96 | PMUL(2,L)=PMLTPC(NP,NM,NZ,NT,B(1),C) | |
97 | NPROTF=NFAC(NPROT) | |
98 | NNEUTF=NFAC(NNEUT) | |
99 | PMUL(2,L)=PMUL(2,L)/(NPROTF*NNEUTF) | |
100 | ANORM(2,NT)=ANORM(2,NT)+PMUL(2,L) | |
101 | 2 CONTINUE | |
102 | DO 3 I=1,60 | |
103 | IF(ANORM(1,I).GT.0.) ANORM(1,I)=1./ANORM(1,I) | |
104 | IF(ANORM(2,I).GT.0.) ANORM(2,I)=1./ANORM(2,I) | |
105 | 3 CONTINUE | |
106 | IF(.NOT.NPRT(10)) GOTO 10 | |
107 | WRITE(NEWBCD,2001) | |
108 | DO 4 NFL=1,2 | |
109 | WRITE(NEWBCD,2002) NFL | |
110 | WRITE(NEWBCD,2003) (ANORM(NFL,I),I=1,60) | |
111 | WRITE(NEWBCD,2003) (PMUL(NFL,I),I=1,1200) | |
112 | 4 CONTINUE | |
113 | C** CHOOSE PROTON OR NEUTRON AS TARGET | |
114 | 10 NFL=2 | |
115 | CALL GRNDM(RNDM,1) | |
116 | IF(RNDM(1).LT.ZNO2/ATNO2) NFL=1 | |
117 | TARMAS=RMASS(14) | |
118 | IF (NFL .EQ. 2) TARMAS=RMASS(16) | |
119 | S=AMASQ+TARMAS**2+2.0*TARMAS*EN | |
120 | RS=SQRT(S) | |
121 | ENP(8)=AMASQ+TARMAS**2+2.0*TARMAS*ENP(6) | |
122 | ENP(9)=SQRT(ENP(8)) | |
123 | EAB=RS-TARMAS-RMASS(16) | |
124 | C** ELASTIC SCATTERING | |
125 | NP=0 | |
126 | NM=0 | |
127 | NZ=0 | |
128 | N=0. | |
129 | NCECH=0 | |
130 | IF(INT.EQ.2) GOTO 20 | |
131 | C** INTRODUCE CHARGE EXCHANGE REACTION PN --> NP | |
132 | IF(NFL.EQ.2) GOTO 100 | |
133 | IPLAB=IFIX(P*2.5)+1 | |
134 | IF(IPLAB.GT.10) IPLAB=10 | |
135 | CALL GRNDM(RNDM,1) | |
136 | IF(RNDM(1).GT.CECH(IPLAB)/ATNO2**0.42) GOTO 100 | |
137 | NCECH=1 | |
138 | GOTO 100 | |
139 | C** CHECK IF ENERGETICALLY POSSIBLE TO PRODUCE ONE EXTRA PION IN REACT. | |
140 | 20 IF (EAB .LE. RMASS(7)) GOTO 55 | |
141 | C** SUPPRESSION OF HIGH MULTIPLICITY EVENTS AT LOW MOMENTUM | |
142 | IEAB=IFIX(EAB*5.)+1 | |
143 | IF(IEAB.GT.10) GOTO 22 | |
144 | CALL GRNDM(RNDM,1) | |
145 | IF(RNDM(1).LT.SUPP(IEAB)) GOTO 22 | |
146 | N=1. | |
147 | GOTO (24,23),NFL | |
148 | 23 CONTINUE | |
149 | TEST=-(1+B(2))**2/(2.0*C**2) | |
150 | IF (TEST .GT. EXPXU) TEST=EXPXU | |
151 | IF (TEST .LT. EXPXL) TEST=EXPXL | |
152 | W0=EXP(TEST)/2.0 | |
153 | WM=EXP(TEST) | |
154 | CALL GRNDM(RNDM,1) | |
155 | RAN=RNDM(1) | |
156 | NP=0 | |
157 | NM=0 | |
158 | NZ=1 | |
159 | IF(RAN.LT.W0/(W0+WM)) GOTO 100 | |
160 | NP=0 | |
161 | NM=1 | |
162 | NZ=0 | |
163 | GOTO 100 | |
164 | 24 CONTINUE | |
165 | TEST=-(1+B(1))**2/(2.0*C**2) | |
166 | IF (TEST .GT. EXPXU) TEST=EXPXU | |
167 | IF (TEST .LT. EXPXL) TEST=EXPXL | |
168 | W0=EXP(TEST) | |
169 | WP=EXP(TEST)/2.0 | |
170 | TEST=-(-1+B(1))**2/(2.0*C**2) | |
171 | IF (TEST .GT. EXPXU) TEST=EXPXU | |
172 | IF (TEST .LT. EXPXL) TEST=EXPXL | |
173 | WM=EXP(TEST)/2.0 | |
174 | WT=W0+WP+WM | |
175 | WP=W0+WP | |
176 | CALL GRNDM(RNDM,1) | |
177 | RAN=RNDM(1) | |
178 | NP=0 | |
179 | NM=0 | |
180 | NZ=1 | |
181 | IF(RAN.LT.W0/WT) GOTO 100 | |
182 | NP=1 | |
183 | NM=0 | |
184 | NZ=0 | |
185 | IF(RAN.LT.WP/WT) GOTO 100 | |
186 | NP=0 | |
187 | NM=1 | |
188 | NZ=0 | |
189 | GOTO 100 | |
190 | C | |
191 | 22 ALEAB=LOG(EAB) | |
192 | C** NO. OF TOTAL PARTICLES VS SQRT(S)-2*MP | |
193 | N=3.62567+0.665843*ALEAB+0.336514*ALEAB*ALEAB | |
194 | * +0.117712*ALEAB*ALEAB*ALEAB+0.0136912*ALEAB*ALEAB*ALEAB*ALEAB | |
195 | N=N-2. | |
196 | C** NORMALIZATION CONSTANT FOR KNO-DISTRIBUTION | |
197 | ANPN=0. | |
198 | DO 21 NT=1,60 | |
199 | TEST=-(PI/4.0)*(NT/N)**2 | |
200 | IF (TEST .GT. EXPXU) TEST=EXPXU | |
201 | IF (TEST .LT. EXPXL) TEST=EXPXL | |
202 | ANPN=ANPN+PI*NT*EXP(TEST)/(2.0*N*N) | |
203 | 21 CONTINUE | |
204 | ANPN=1./ANPN | |
205 | C** P OR N AS TARGET | |
206 | CALL GRNDM(RNDM,1) | |
207 | RAN=RNDM(1) | |
208 | EXCS=0. | |
209 | GOTO (40,30),NFL | |
210 | C** FOR N AS TARGET | |
211 | 30 L=0 | |
212 | DO 31 NP1=1,20 | |
213 | NP=NP1-1 | |
214 | NPP1=NP1+2 | |
215 | DO 31 NM1=NP1,NPP1 | |
216 | NM=NM1-1 | |
217 | DO 31 NZ1=1,20 | |
218 | NZ=NZ1-1 | |
219 | L=L+1 | |
220 | IF(L.GT.1200) GOTO 31 | |
221 | NT=NP+NM+NZ | |
222 | IF(NT.LE.0.OR.NT.GT.60) GOTO 31 | |
223 | TEST=-(PI/4.0)*(NT/N)**2 | |
224 | IF (TEST .GT. EXPXU) TEST=EXPXU | |
225 | IF (TEST .LT. EXPXL) TEST=EXPXL | |
226 | DUM1=ANPN*PI*NT*PMUL(1,L)*ANORM(1,NT)/(2.0*N*N) | |
227 | DUM2=ABS(DUM1) | |
228 | DUM3=EXP(TEST) | |
229 | ADDNVE=0.0 | |
230 | IF (DUM2 .GE. 1.0) ADDNVE=DUM1*DUM3 | |
231 | IF ((DUM2 .LT. 1.0) .AND. (DUM3 .GE. 1.0E-10)) ADDNVE=DUM1*DUM3 | |
232 | EXCS=EXCS+ADDNVE | |
233 | IF(RAN.LT.EXCS) GOTO 100 | |
234 | 31 CONTINUE | |
235 | GOTO 80 | |
236 | C** FOR P AS TARGET | |
237 | 40 L=0 | |
238 | DO 41 NP1=1,20 | |
239 | NP=NP1-1 | |
240 | NMM1=NP1-1 | |
241 | IF(NMM1.LE.1) NMM1=1 | |
242 | NPP1=NP1+1 | |
243 | DO 41 NM1=NMM1,NPP1 | |
244 | NM=NM1-1 | |
245 | DO 41 NZ1=1,20 | |
246 | NZ=NZ1-1 | |
247 | L=L+1 | |
248 | IF(L.GT.1200) GOTO 41 | |
249 | NT=NP+NM+NZ | |
250 | IF(NT.LE.0.OR.NT.GT.60) GOTO 41 | |
251 | TEST=-(PI/4.0)*(NT/N)**2 | |
252 | IF (TEST .GT. EXPXU) TEST=EXPXU | |
253 | IF (TEST .LT. EXPXL) TEST=EXPXL | |
254 | DUM1=ANPN*PI*NT*PMUL(2,L)*ANORM(2,NT)/(2.0*N*N) | |
255 | DUM2=ABS(DUM1) | |
256 | DUM3=EXP(TEST) | |
257 | ADDNVE=0.0 | |
258 | IF (DUM2 .GE. 1.0) ADDNVE=DUM1*DUM3 | |
259 | IF ((DUM2 .LT. 1.0) .AND. (DUM3 .GE. 1.0E-10)) ADDNVE=DUM1*DUM3 | |
260 | EXCS=EXCS+ADDNVE | |
261 | IF(RAN.LT.EXCS) GOTO 100 | |
262 | 41 CONTINUE | |
263 | GOTO 80 | |
264 | 50 IF(NPRT(4)) | |
265 | *WRITE(NEWBCD,1003) EAB,N,NFL,NP,NM,NZ | |
266 | CALL STPAIR | |
267 | IF(INT.EQ.1) CALL TWOB(16,NFL,N) | |
268 | IF(INT.EQ.2) CALL GENXPT(16,NFL,N) | |
269 | GO TO 9999 | |
270 | 55 IF(NPRT(4)) | |
271 | *WRITE(NEWBCD,1001) | |
272 | GOTO 53 | |
273 | C** EXCLUSIVE REACTION NOT FOUND | |
274 | 80 IF(NPRT(4)) | |
275 | *WRITE(NEWBCD,1004) RS,N | |
276 | 53 INT=1 | |
277 | NP=0 | |
278 | NM=0 | |
279 | NZ=0 | |
280 | 100 DO 101 I=1,60 | |
281 | 101 IPA(I)=0 | |
282 | IF(INT.LE.0) GOTO 131 | |
283 | NPROT=1-NP+NM+(1-NFL) | |
284 | NNEUT=2-NPROT | |
285 | GOTO (112,102),NFL | |
286 | 102 GOTO (103,104),INT | |
287 | 103 IPA(1)=16 | |
288 | IPA(2)=16 | |
289 | NT=2 | |
290 | GOTO 130 | |
291 | 104 IF(NNEUT.EQ.1) GOTO 105 | |
292 | IF(NNEUT.EQ.2) GOTO 106 | |
293 | IPA(1)=14 | |
294 | IPA(2)=14 | |
295 | GOTO 120 | |
296 | 105 IPA(1)=14 | |
297 | IPA(2)=16 | |
298 | CALL GRNDM(RNDM,1) | |
299 | IF(RNDM(1).LT.0.5) GOTO 120 | |
300 | IPA(1)=16 | |
301 | IPA(2)=14 | |
302 | GOTO 120 | |
303 | 106 IPA(1)=16 | |
304 | IPA(2)=16 | |
305 | GOTO 120 | |
306 | 112 GOTO (113,114),INT | |
307 | 113 IPA(1)=16 | |
308 | IPA(2)=14 | |
309 | NT=2 | |
310 | IF(NCECH.EQ.0) GOTO 130 | |
311 | IPA(1)=14 | |
312 | IPA(2)=16 | |
313 | GOTO 130 | |
314 | 114 IF(NNEUT.EQ.1) GOTO 115 | |
315 | IF(NNEUT.EQ.2) GOTO 116 | |
316 | IPA(1)=14 | |
317 | IPA(2)=14 | |
318 | GOTO 120 | |
319 | 115 IPA(1)=14 | |
320 | IPA(2)=16 | |
321 | CALL GRNDM(RNDM,1) | |
322 | IF(RNDM(1).LT.0.33) GOTO 120 | |
323 | IPA(1)=16 | |
324 | IPA(2)=14 | |
325 | GOTO 120 | |
326 | 116 IPA(1)=16 | |
327 | IPA(2)=16 | |
328 | 120 NT=2 | |
329 | IF(NP.EQ.0) GOTO 122 | |
330 | DO 121 I=1,NP | |
331 | NT=NT+1 | |
332 | 121 IPA(NT)=7 | |
333 | 122 IF(NM.EQ.0) GOTO 124 | |
334 | DO 123 I=1,NM | |
335 | NT=NT+1 | |
336 | 123 IPA(NT)=9 | |
337 | 124 IF(NZ.EQ.0) GOTO 130 | |
338 | DO 125 I=1,NZ | |
339 | NT=NT+1 | |
340 | 125 IPA(NT)=8 | |
341 | 130 IF(NPRT(4)) | |
342 | *WRITE(NEWBCD,2004) NT,(IPA(I),I=1,20) | |
343 | GOTO 50 | |
344 | 131 IF(NPRT(4)) | |
345 | *WRITE(NEWBCD,2005) | |
346 | C | |
347 | 1001 FORMAT('0*CASN* CASCADE ENERGETICALLY NOT POSSIBLE NUCLEAR', | |
348 | * ' EXCITATION',2X,F8.4,2X,'INCIDENT ENERGY LOST') | |
349 | 1003 FORMAT(' *CASN* NEUTRON-INDUCED CASCADE,', | |
350 | $ ' AVAIL. ENERGY',2X,F8.4, | |
351 | $ 2X,'<NTOT>',2X,F8.4,2X,'FROM',4(2X,I3),2X,'PARTICLES') | |
352 | 1004 FORMAT(' *CASN* NEUTRON-INDUCED CASCADE,', | |
353 | $ ' EXCLUSIVE REACTION NOT FOUND', | |
354 | $ ' TRY ELASTIC SCATTERING AVAIL. ENERGY',2X,F8.4,2X, | |
355 | $ '<NTOT>',2X,F8.4) | |
356 | 2001 FORMAT('0*CASN* TABLES FOR MULT. DATA NEUTRON INDUCED REACTION', | |
357 | $ ' FOR DEFINITION OF NUMBERS SEE FORTRAN CODING') | |
358 | 2002 FORMAT(' *CASN* TARGET PARTICLE FLAG',2X,I5) | |
359 | 2003 FORMAT(1H ,10E12.4) | |
360 | 2004 FORMAT(' *CASN* ',I3,2X,'PARTICLES , MASS INDEX ARRAY',2X,20I4) | |
361 | 2005 FORMAT(' *CASN* NO PARTICLES PRODUCED') | |
362 | C | |
363 | 9999 CONTINUE | |
364 | END |