5 * Revision 1.1.1.1 1995/10/24 10:21:01 cernlib
9 #include "geant321/pilot.h"
10 *CMZ : 3.21/02 29/03/94 15.41.39 by S.Giani
12 SUBROUTINE CASK0(K,INT,NFL)
14 C *** CASCADE OF K0 ***
15 C *** NVE 04-MAY-1988 CERN GENEVA ***
17 C ORIGIN : H.FESEFELDT (13-SEP-1987)
19 C K0 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),SUPP(10),CECH(10),B(2)
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/0.33,0.27,0.29,0.31,0.27,0.18,0.13,0.10,0.09,0.07/
42 DATA B/0.7,0.7/,C/1.25/
44 C --- INITIALIZATION INDICATED BY KGINIT(6) ---
45 IF (KGINIT(6) .NE. 0) GO TO 10
48 C --- INITIALIZE PMUL AND ANORM ARRAYS ---
52 IF (J .LE. 60) ANORM(I,J)=0.0
56 C** COMPUTE NORMALIZATION CONSTANTS
72 IF(NT.LE.0.OR.NT.GT.60) GOTO 1
73 PMUL(1,L)=PMLTPC(NP,NM,NZ,NT,B(1),C)
74 ANORM(1,NT)=ANORM(1,NT)+PMUL(1,L)
89 IF(NT.LE.0.OR.NT.GT.60) GOTO 2
90 PMUL(2,L)=PMLTPC(NP,NM,NZ,NT,B(2),C)
91 ANORM(2,NT)=ANORM(2,NT)+PMUL(2,L)
94 IF(ANORM(1,I).GT.0.) ANORM(1,I)=1./ANORM(1,I)
95 IF(ANORM(2,I).GT.0.) ANORM(2,I)=1./ANORM(2,I)
97 IF(.NOT.NPRT(10)) GOTO 10
100 WRITE(NEWBCD,2002) NFL
101 WRITE(NEWBCD,2003) (ANORM(NFL,I),I=1,60)
102 WRITE(NEWBCD,2003) (PMUL(NFL,I),I=1,1200)
104 C** CHOOSE PROTON OR NEUTRON AS TARGET
107 IF(RNDM(1).LT.ZNO2/ATNO2) NFL=1
109 IF (NFL .EQ. 2) TARMAS=RMASS(16)
110 S=AMASQ+TARMAS**2+2.0*TARMAS*EN
112 ENP(8)=AMASQ+TARMAS**2+2.0*TARMAS*ENP(6)
114 EAB=RS-TARMAS-RMASS(11)
116 C** ELASTIC SCATTERING
123 IF(NFL.EQ.2) IPA(2)=16
125 C** FOR K0 P REACTIONS CHANGE SOME OF THE ELASTIC CROSS SECTION
127 IF(NFL.EQ.2) GOTO 100
129 IF(IPLAB.GT.10) IPLAB=10
131 IF(RNDM(1).GT.CECH(IPLAB)/ATNO2**0.42) GOTO 100
135 C** CHECK IF ENERGETICALLY POSSIBLE TO PRODUCE ONE EXTRA PION IN REACT.
136 20 IF (EAB .LE. RMASS(7)) GOTO 55
137 C** SUPPRESSION OF HIGH MULTIPLICITY EVENTS AT LOW MOMENTUM
139 IF(IEAB.GT.10) GOTO 22
141 IF(RNDM(1).LT.SUPP(IEAB)) GOTO 22
145 TEST=-(1+B(1))**2/(2.0*C**2)
146 IF (TEST .LT. EXPXL) TEST=EXPXL
147 IF (TEST .GT. EXPXU) TEST=EXPXU
149 TEST=-(-1+B(1))**2/(2.0*C**2)
150 IF (TEST .LT. EXPXL) TEST=EXPXL
151 IF (TEST .GT. EXPXU) TEST=EXPXU
160 IF(RAN.LT.W0/(W0+WM)) GOTO 50
166 TEST=-(1+B(2))**2/(2.0*C**2)
167 IF (TEST .LT. EXPXL) TEST=EXPXL
168 IF (TEST .GT. EXPXU) TEST=EXPXU
171 TEST=-(-1+B(2))**2/(2.0*C**2)
172 IF (TEST .LT. EXPXL) TEST=EXPXL
173 IF (TEST .GT. EXPXU) TEST=EXPXU
182 IF(RAN.LT.W0/WT) GOTO 50
186 IF(RAN.LT.WP/WT) GOTO 50
193 C** NO. OF TOTAL PARTICLES VS SQRT(S)-2*MP
194 N=3.62567+0.665843*ALEAB+0.336514*ALEAB*ALEAB
195 * +0.117712*ALEAB*ALEAB*ALEAB+0.0136912*ALEAB*ALEAB*ALEAB*ALEAB
197 C** NORMALIZATION CONSTANT FOR KNO-DISTRIBUTION
200 TEST=-(PI/4.0)*(NT/N)**2
201 IF (TEST .LT. EXPXL) TEST=EXPXL
202 IF (TEST .GT. EXPXU) TEST=EXPXU
207 IF (DUM2 .GE. 1) ADDNVE=DUM1*DUM3
208 IF ((DUM2 .LT. 1) .AND. (DUM3 .GE. 1.0E-10)) ADDNVE=DUM1*DUM3
229 IF(L.GT.1200) GOTO 31
231 IF(NT.LE.0.OR.NT.GT.60) GOTO 31
232 TEST=-(PI/4.0)*(NT/N)**2
233 IF (TEST .LT. EXPXL) TEST=EXPXL
234 IF (TEST .GT. EXPXU) TEST=EXPXU
235 DUM1=ANPN*PI*NT*PMUL(1,L)*ANORM(1,NT)/(2.0*N*N)
239 IF (DUM2 .GE. 1) ADDNVE=DUM1*DUM3
240 IF ((DUM2 .LT. 1) .AND. (DUM3 .GE. 1.0E-10)) ADDNVE=DUM1*DUM3
242 IF(RAN.LT.EXCS) GOTO 50
256 IF(L.GT.1200) GOTO 41
258 IF(NT.LE.0.OR.NT.GT.60) GOTO 41
259 TEST=-(PI/4.0)*(NT/N)**2
260 IF (TEST .LT. EXPXL) TEST=EXPXL
261 IF (TEST .GT. EXPXU) TEST=EXPXU
262 DUM1=ANPN*PI*NT*PMUL(2,L)*ANORM(2,NT)/(2.0*N*N)
266 IF (DUM2 .GE. 1) ADDNVE=DUM1*DUM3
267 IF ((DUM2 .LT. 1) .AND. (DUM3 .GE. 1.0E-10)) ADDNVE=DUM1*DUM3
269 IF(RAN.LT.EXCS) GOTO 50
273 60 IF(NP.EQ.1+NM) GOTO 61
274 IF(NP.EQ.2+NM) GOTO 63
278 61 CALL GRNDM(RNDM,1)
279 IF(RNDM(1).LT.0.5) GOTO 62
289 65 IF(NP.EQ.NM) GOTO 66
290 IF(NP.EQ.1+NM) GOTO 68
294 66 CALL GRNDM(RNDM,1)
295 IF(RNDM(1).LT.0.25) GOTO 67
306 *WRITE(NEWBCD,1003) EAB,N,NFL,NP,NM,NZ
308 IF(INT.EQ.1) CALL TWOB(11,NFL,N)
309 IF(INT.EQ.2) CALL GENXPT(11,NFL,N)
314 C** EXCLUSIVE REACTION NOT FOUND
316 *WRITE(NEWBCD,1004) RS,N
324 IF(NFL.EQ.2) IPA(2)=16
327 IF(INT.LE.0) GOTO 131
333 122 IF(NM.EQ.0) GOTO 124
337 124 IF(NZ.EQ.0) GOTO 130
342 *WRITE(NEWBCD,2004) NT,(IPA(I),I=1,20)
344 IF(IPA(I).NE.11) GOTO 132
346 IF(RNDM(1).LT.0.5) GOTO 132
353 1001 FORMAT('0*CASK0* CASCADE ENERGETICALLY NOT POSSIBLE',
354 $ ' CONTINUE WITH QUASI-ELASTIC SCATTERING')
355 1003 FORMAT(' *CASK0* K0 -INDUCED CASCADE,',
356 $ ' AVAIL. ENERGY',2X,F8.4,
357 $ 2X,'<NTOT>',2X,F8.4,2X,'FROM',4(2X,I3),2X,'PARTICLES')
358 1004 FORMAT(' *CASK0* K0 -INDUCED CASCADE,',
359 $ ' EXCLUSIVE REACTION NOT FOUND',
360 $ ' TRY ELASTIC SCATTERING AVAIL. ENERGY',2X,F8.4,2X,
362 2001 FORMAT('0*CASK0* TABLES FOR MULT. DATA K0 INDUCED REACTION',
363 $ ' FOR DEFINITION OF NUMBERS SEE FORTRAN CODING')
364 2002 FORMAT(' *CASK0* TARGET PARTICLE FLAG',2X,I5)
365 2003 FORMAT(1H ,10E12.4)
366 2004 FORMAT(' *CASK0* ',I3,2X,'PARTICLES , MASS INDEX ARRAY',2X,20I4)
367 2005 FORMAT(' *CASK0* NO PARTICLES PRODUCED')