| 1 | SUBROUTINE COMPT
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| 2 | C VERSION 4.00 -- 26 JAN 1986/1900
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| 3 | C******************************************************************
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| 4 | C BUTCHER AND MESSEL'S CROSS SECTION EXPRESSION IS USED
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| 5 | C (BUTCHER AND MESSEL, OP.CIT., P. 17-19,25), BUT THE
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| 6 | C 1/EPSILON PART IS NOT SAMPLED IN THE WAY THAT THEY DO.
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| 7 | C THIS ROUTINE CALLS THEIR 'EPSILON' VARIABLE BY THE NAME 'BR'.
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| 8 | C BR=FINAL PHOTON ENERGY /INITIAL PHOTON ENERGY.
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| 9 | C BR0 = MINIMUM BR = 1./(1.+2.*(E(NP)/RM))
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| 10 | C MAXIMUM BR IS 1.
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| 11 | C BUTCHER AND MESSEL'S EXPRESSION FOR THE DIFFERENTIAL CROSS
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| 12 | C SECTION IS PROPORTIONAL TO
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| 13 | C (1./BR+BR)*(1.-BR*SINTHE**2/(1.+BR*BR))
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| 14 | C WE SHALL SAMPLE FROM THE FIRST FACTOR FROM THE INTERVAL (BR0,1)
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| 15 | C AND USE THE SECOND FACTOR AS A REJECTION FUNCTION.
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| 16 | C******************************************************************
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| 17 | DOUBLE PRECISION PEIG,PESG,PESE
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| 18 | *KEEP,RANDPA.
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| 19 | COMMON /RANDPA/ FAC,U1,U2,RD,NSEQ,ISEED,KNOR
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| 20 | DOUBLE PRECISION FAC,U1,U2
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| 21 | REAL RD(3000)
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| 22 | INTEGER ISEED(103,10),NSEQ
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| 23 | LOGICAL KNOR
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| 24 | *KEEP,RUNPAR.
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| 25 | COMMON /RUNPAR/ FIXHEI,THICK0,HILOECM,HILOELB,
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| 26 | * STEPFC,NRRUN,NSHOW,PATAPE,MONIIN,
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| 27 | * MONIOU,MDEBUG,NUCNUC,
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| 28 | * CETAPE,
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| 29 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 30 | * N1STTR,MDBASE,
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| 31 | * DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 32 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 33 | * ,GHEISH,GHESIG
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| 34 | COMMON /RUNPAC/ DSN,HOST,USER
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| 35 | DOUBLE PRECISION FIXHEI,THICK0,HILOECM,HILOELB
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| 36 | REAL STEPFC
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| 37 | INTEGER NRRUN,NSHOW,PATAPE,MONIIN,MONIOU,MDEBUG,NUCNUC,
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| 38 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 39 | * N1STTR,MDBASE
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| 40 | INTEGER CETAPE
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| 41 | CHARACTER*79 DSN
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| 42 | CHARACTER*20 HOST,USER
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| 43 |
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| 44 | LOGICAL DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 45 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 46 | * ,GHEISH,GHESIG
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| 47 | *KEEP,STACKE.
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| 48 | COMMON/STACKE/ E,TIME,X,Y,Z,U,V,W,DNEAR,IQ,IGEN,IR,IOBS,LPCTE,NP
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| 49 | DOUBLE PRECISION E(60),TIME(60)
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| 50 | REAL X(60),Y(60),Z(60),U(60),V(60),W(60),DNEAR(60)
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| 51 | INTEGER IQ(60),IGEN(60),IR(60),IOBS(60),LPCTE(60),NP
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| 52 | *KEND.
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| 53 | COMMON/THRESH/RMT2,RMSQ,ESCD2,AP,API,AE,UP,UE,TE,THMOLL
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| 54 | COMMON/UPHIOT/THETA,SINTHE,COSTHE,SINPHI, COSPHI,PI,TWOPI,PI5D2
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| 55 | DOUBLE PRECISION PZERO,PRM,PRMT2,RMI,VC
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| 56 | COMMON/USEFUL/PZERO,PRM,PRMT2,RMI,VC,RM,MEDIUM,MEDOLD,IBLOBE,ICALL
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| 57 | COMMON/ACLOCK/NCLOCK,JCLOCK
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| 58 | C_____IF (NCLOCK.GT.JCLOCK) THEN
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| 59 | C______WRITE(MDEBUG,* )' COMPT: NP=',NP,' IR=',IR(NP),' IOBS=',IOBS(NP)
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| 60 | C______CALL AUSGB2
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| 61 | C_____END IF
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| 62 | PEIG=E(NP)
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| 63 | EIG=PEIG
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| 64 | EGP=EIG*RMI
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| 65 | BR0I=1.+2.*EGP
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| 66 | BR0=1./BR0I
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| 67 | ALPH1=LOG(BR0I)
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| 68 | ALPH2=EGP*(BR0I+1.)*BR0*BR0
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| 69 | SUMALP = ALPH1+ALPH2
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| 70 | 371 CONTINUE
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| 71 | CALL RMMAR(RNNO15,1,2)
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| 72 | IF (ALPH1.GE.SUMALP*RNNO15) THEN
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| 73 | CALL RMMAR(RNNO16,1,2)
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| 74 | BR=EXP(ALPH1*RNNO16)*BR0
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| 75 | ELSE
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| 76 | CALL RMMAR(RD,2,2)
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| 77 | BRP=RD(1)
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| 78 | RNNO18=RD(2)
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| 79 | IF (EGP.GE.(EGP+1.)*RNNO18) THEN
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| 80 | CALL RMMAR(RNNO19,1,2)
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| 81 | BRP=MAX(BRP,RNNO19)
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| 82 | END IF
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| 83 | BR=((BR0I-1.)*BRP+1.)*BR0
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| 84 | END IF
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| 85 | ESG=BR*EIG
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| 86 | A1MIBR = 1.-BR
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| 87 | TEMP=RM*A1MIBR/ESG
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| 88 | SINTHE=MAX(0.0,TEMP*(2.0-TEMP))
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| 89 | CALL RMMAR(RNNO20,1,2)
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| 90 | IF(((1.0-RNNO20)*(1.0+BR*BR).GE.BR*SINTHE))GO TO372
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| 91 | GO TO 371
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| 92 | 372 CONTINUE
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| 93 | SINTHE=SQRT(SINTHE)
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| 94 | COSTHE=1.0-TEMP
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| 95 | PESG=ESG
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| 96 | PESE=PEIG-PESG+PRM
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| 97 | ESE=PESE
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| 98 | CALL UPHI(2,1)
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| 99 | NP=NP+1
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| 100 | PSQ=ESE*ESE-RMSQ
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| 101 | IF (PSQ.LE.0.0) THEN
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| 102 | COSTHE=0.
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| 103 | SINTHE=-1.
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| 104 | ELSE
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| 105 | COSTHE=(ESE+ESG)*A1MIBR/SQRT(PSQ)
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| 106 | SINTHE=-SQRT(MAX(0.0,1.0-COSTHE*COSTHE))
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| 107 | END IF
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| 108 | CALL UPHI(3,2)
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| 109 | IF (ESE.LE.ESG) THEN
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| 110 | IQ(NP)=3
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| 111 | E(NP)=PESE
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| 112 | E(NP-1)=PESG
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| 113 | ELSE
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| 114 | IQ(NP)=1
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| 115 | IQ(NP-1)=3
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| 116 | E(NP)=PESG
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| 117 | E(NP-1)=PESE
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| 118 | T=U(NP)
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| 119 | U(NP)=U(NP-1)
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| 120 | U(NP-1)=T
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| 121 | T=V(NP)
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| 122 | V(NP)=V(NP-1)
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| 123 | V(NP-1)=T
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| 124 | T=W(NP)
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| 125 | W(NP)=W(NP-1)
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| 126 | W(NP-1)=T
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| 127 | END IF
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| 128 | RETURN
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| 129 | END
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