5 * Revision 1.1.1.1 1995/10/24 10:21:02 cernlib
9 #include "geant321/pilot.h"
10 *CMZ : 3.21/02 29/03/94 15.41.39 by S.Giani
12 SUBROUTINE CASSM(K,INT,NFL)
14 C *** CASCADE OF SIGMA- ***
15 C *** NVE 04-MAY-1988 CERN GENEVA ***
17 C ORIGIN : H.FESEFELDT (13-SEP-1987)
19 C S- 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.
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/s_kginit.inc"
34 #include "geant321/limits.inc"
37 DIMENSION PMUL(2,1200),ANORM(2,60),CECH(10),IIPA(10,2),B(2)
40 DATA CECH/0.50,0.45,0.40,0.35,0.30,0.25,0.06,0.04,0.005,0./
41 DATA IIPA/21,18,14,16,16,16,16,16,16,16,
42 * 16,16,22,21,18,22,22,22,22,22/
43 DATA B/0.7,0.7/,C/1.25/
45 C --- INITIALIZATION INDICATED BY KGINIT(12) ---
46 IF (KGINIT(12) .NE. 0) GO TO 10
49 C --- INITIALIZE PMUL AND ANORM ARRAYS ---
53 IF (J .LE. 60) ANORM(I,J)=0.0
57 C** COMPUTE NORMALIZATION CONSTANTS
73 IF(NT.LE.0.OR.NT.GT.60) GOTO 1
74 PMUL(1,L)=PMLTPC(NP,NM,NZ,NT,B(2),C)
75 ANORM(1,NT)=ANORM(1,NT)+PMUL(1,L)
90 IF(NT.LE.0.OR.NT.GT.60) GOTO 2
91 PMUL(2,L)=PMLTPC(NP,NM,NZ,NT,B(1),C)
92 ANORM(2,NT)=ANORM(2,NT)+PMUL(2,L)
95 IF(ANORM(1,I).GT.0.) ANORM(1,I)=1./ANORM(1,I)
96 IF(ANORM(2,I).GT.0.) ANORM(2,I)=1./ANORM(2,I)
98 IF(.NOT.NPRT(10)) GOTO 10
101 WRITE(NEWBCD,2002) NFL
102 WRITE(NEWBCD,2003) (ANORM(NFL,I),I=1,60)
103 WRITE(NEWBCD,2003) (PMUL(NFL,I),I=1,1200)
105 C** CHOOSE PROTON OR NEUTRON AS TARGET
108 IF(RNDM(1).LT.ZNO2/ATNO2) NFL=1
110 IF (NFL .EQ. 2) TARMAS=RMASS(16)
111 S=AMASQ+TARMAS**2+2.0*TARMAS*EN
113 ENP(8)=AMASQ+TARMAS**2+2.0*TARMAS*ENP(6)
115 EAB=RS-TARMAS-RMASS(22)
116 C** ELASTIC SCATTERING
123 IF(NFL.EQ.2) IPA(2)=16
125 C** INTRODUCE CHARGE AND STRANGENESS EXCHANGE REACTIONS
126 C** S-P --> S0N, S-P --> L N ,
127 C** S-P --> PS-, S-P --> N S0 , S-P --> N L
130 IF(IPLAB.GT.10) IPLAB=10
132 IF(RNDM(1).GT.CECH(IPLAB)/ATNO2**0.42) GOTO 120
141 C** CHECK IF ENERGETICALLY POSSIBLE TO PRODUCE ONE EXTRA PION IN REACT.
142 20 IF (EAB .LE. RMASS(7)) GOTO 55
144 C** NO. OF TOTAL PARTICLES VS SQRT(S)-MP-MSM
145 N=3.62567+0.665843*ALEAB+0.336514*ALEAB*ALEAB
146 * +0.117712*ALEAB*ALEAB*ALEAB+0.0136912*ALEAB*ALEAB*ALEAB*ALEAB
148 C** NORMALIZATION CONSTANT FOR KNO-DISTRIBUTION
151 TEST=-(PI/4.0)*(NT/N)**2
152 IF (TEST .LT. EXPXL) TEST=EXPXL
153 IF (TEST .GT. EXPXU) TEST=EXPXU
158 IF (DUM2 .GE. 1.0) ADDNVE=DUM1*DUM3
159 IF ((DUM2 .LT. 1.0) .AND. (DUM3 .GE. 1.0E-10)) ADDNVE=DUM1*DUM3
180 IF(L.GT.1200) GOTO 31
182 IF(NT.LE.0.OR.NT.GT.60) GOTO 31
183 TEST=-(PI/4.0)*(NT/N)**2
184 IF (TEST .LT. EXPXL) TEST=EXPXL
185 IF (TEST .GT. EXPXU) TEST=EXPXU
186 DUM1=ANPN*PI*NT*PMUL(1,L)*ANORM(1,NT)/(2.0*N*N)
190 IF (DUM2 .GE. 1.0) ADDNVE=DUM1*DUM3
191 IF ((DUM2 .LT. 1.0) .AND. (DUM3 .GE. 1.0E-10)) ADDNVE=DUM1*DUM3
193 IF(RAN.LT.EXCS) GOTO 100
207 IF(L.GT.1200) GOTO 41
209 IF(NT.LE.0.OR.NT.GT.60) GOTO 41
210 TEST=-(PI/4.0)*(NT/N)**2
211 IF (TEST .LT. EXPXL) TEST=EXPXL
212 IF (TEST .GT. EXPXU) TEST=EXPXU
213 DUM1=ANPN*PI*NT*PMUL(2,L)*ANORM(2,NT)/(2.0*N*N)
217 IF (DUM2 .GE. 1.0) ADDNVE=DUM1*DUM3
218 IF ((DUM2 .LT. 1.0) .AND. (DUM3 .GE. 1.0E-10)) ADDNVE=DUM1*DUM3
220 IF(RAN.LT.EXCS) GOTO 100
224 *WRITE(NEWBCD,1003) EAB,N,NFL,NP,NM,NZ
225 IF(INT.EQ.1) CALL TWOB(22,NFL,N)
226 IF(INT.EQ.2) CALL GENXPT(22,NFL,N)
231 C** EXCLUSIVE REACTION NOT FOUND
233 *WRITE(NEWBCD,1004) RS,N
240 IF(NFL.EQ.2) IPA(2)=16
244 IF(INT.LE.0) GOTO 131
250 GOTO (103,104,105),NCHT
253 IF(RNDM(1).LT.0.5) IPA(1)=18
259 IF(RNDM(1).LT.0.5) GOTO 120
261 IF(RNDM(2).LT.0.5) IPA(1)=18
271 GOTO (113,114,115),NCHT
274 IF(RNDM(1).LT.0.5) IPA(1)=18
279 IF(RNDM(1).LT.0.5) IPA(1)=18
281 IF(RNDM(2).LT.0.5) GOTO 120
292 122 IF(NM.EQ.0) GOTO 124
296 124 IF(NZ.EQ.0) GOTO 130
301 *WRITE(NEWBCD,2004) NT,(IPA(I),I=1,20)
306 1001 FORMAT('0*CASSM* CASCADE ENERGETICALLY NOT POSSIBLE',
307 $ ' CONTINUE WITH QUASI-ELASTIC SCATTERING')
308 1003 FORMAT(' *CASSM* SIGMA- -INDUCED CASCADE,',
309 $ ' AVAIL. ENERGY',2X,F8.4,
310 $ 2X,'<NTOT>',2X,F8.4,2X,'FROM',4(2X,I3),2X,'PARTICLES')
311 1004 FORMAT(' *CASSM* SIGMA- -INDUCED CASCADE,',
312 $ ' EXCLUSIVE REACTION NOT FOUND',
313 $ ' TRY ELASTIC SCATTERING AVAIL. ENERGY',2X,F8.4,2X,
315 2001 FORMAT('0*CASSM* TABLES FOR MULT. DATA SIGMA- INDUCED REACTION',
316 $ ' FOR DEFINITION OF NUMBERS SEE FORTRAN CODING')
317 2002 FORMAT(' *CASSM* TARGET PARTICLE FLAG',2X,I5)
318 2003 FORMAT(1H ,10E12.4)
319 2004 FORMAT(' *CASSM* ',I3,2X,'PARTICLES , MASS INDEX ARRAY',2X,20I4)
320 2005 FORMAT(' *CASSM* NO PARTICLES PRODUCED')