| 1 | SUBROUTINE MUPRPR
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| 2 |
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| 3 | C-----------------------------------------------------------------------
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| 4 | C MU(ON) P(AI)R PR(ODUCTION)
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| 5 | C
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| 6 | C TREATES MUON PAIR PRODUCTION (WITHOUT POLARISATION EFFECTS)
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| 7 | C IN ANALOGY WITH SUBROUTINE GPAIRM FROM GEANT WRITTEN BY L. URBAN
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| 8 | C EXPLANATIONS SEE CERN PROGRM LIBRARY LONG WRITEUP W5013
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| 9 | C THIS SUBROUTINE IS CALLED FROM MUTRAC
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| 10 | C
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| 11 | C DESIGN : D. HECK IK3 FZK KARLSRUHE
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| 12 | C-----------------------------------------------------------------------
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| 13 |
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| 14 | IMPLICIT NONE
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| 15 | *KEEP,CONST.
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| 16 | COMMON /CONST/ PI,PI2,OB3,TB3,ENEPER
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| 17 | DOUBLE PRECISION PI,PI2,OB3,TB3,ENEPER
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| 18 | *KEEP,ELABCT.
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| 19 | COMMON /ELABCT/ ELCUT
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| 20 | DOUBLE PRECISION ELCUT(4)
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| 21 | *KEEP,GENER.
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| 22 | COMMON /GENER/ GEN,ALEVEL
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| 23 | DOUBLE PRECISION GEN,ALEVEL
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| 24 | *KEEP,MUPART.
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| 25 | COMMON /MUPART/ AMUPAR,BCUT,CMUON,FMUBRM,FMUORG
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| 26 | DOUBLE PRECISION AMUPAR(14),BCUT,CMUON(11)
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| 27 | LOGICAL FMUBRM,FMUORG
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| 28 | *KEEP,PAM.
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| 29 | COMMON /PAM/ PAMA,SIGNUM
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| 30 | DOUBLE PRECISION PAMA(6000),SIGNUM(6000)
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| 31 | *KEEP,PARPAR.
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| 32 | COMMON /PARPAR/ CURPAR,SECPAR,PRMPAR,OUTPAR,C,
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| 33 | * E00,E00PN,PTOT0,PTOT0N,THICKH,ITYPE,LEVL
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| 34 | DOUBLE PRECISION CURPAR(14),SECPAR(14),PRMPAR(14),OUTPAR(14),
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| 35 | * C(50),E00,E00PN,PTOT0,PTOT0N,THICKH
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| 36 | INTEGER ITYPE,LEVL
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| 37 | *KEEP,PARPAE.
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| 38 | DOUBLE PRECISION GAMMA,COSTHE,PHI,H,T,X,Y,CHI,BETA,GCM,ECM
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| 39 | EQUIVALENCE (CURPAR(2),GAMMA), (CURPAR(3),COSTHE),
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| 40 | * (CURPAR(4), PHI ), (CURPAR(5), H ),
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| 41 | * (CURPAR(6), T ), (CURPAR(7), X ),
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| 42 | * (CURPAR(8), Y ), (CURPAR(9), CHI ),
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| 43 | * (CURPAR(10),BETA), (CURPAR(11),GCM ),
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| 44 | * (CURPAR(12),ECM )
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| 45 | *KEEP,POLAR.
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| 46 | COMMON /POLAR/ POLART,POLARF
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| 47 | DOUBLE PRECISION POLART,POLARF
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| 48 | *KEEP,RANDPA.
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| 49 | COMMON /RANDPA/ FAC,U1,U2,RD,NSEQ,ISEED,KNOR
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| 50 | DOUBLE PRECISION FAC,U1,U2
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| 51 | REAL RD(3000)
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| 52 | INTEGER ISEED(103,10),NSEQ
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| 53 | LOGICAL KNOR
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| 54 | *KEEP,REST.
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| 55 | COMMON /REST/ CONTNE,TAR,LT
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| 56 | DOUBLE PRECISION CONTNE(3),TAR
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| 57 | INTEGER LT
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| 58 | *KEEP,RUNPAR.
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| 59 | COMMON /RUNPAR/ FIXHEI,THICK0,HILOECM,HILOELB,
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| 60 | * STEPFC,NRRUN,NSHOW,PATAPE,MONIIN,
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| 61 | * MONIOU,MDEBUG,NUCNUC,
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| 62 | * CETAPE,
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| 63 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 64 | * N1STTR,MDBASE,
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| 65 | * DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 66 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 67 | * ,GHEISH,GHESIG
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| 68 | COMMON /RUNPAC/ DSN,HOST,USER
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| 69 | DOUBLE PRECISION FIXHEI,THICK0,HILOECM,HILOELB
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| 70 | REAL STEPFC
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| 71 | INTEGER NRRUN,NSHOW,PATAPE,MONIIN,MONIOU,MDEBUG,NUCNUC,
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| 72 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 73 | * N1STTR,MDBASE
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| 74 | INTEGER CETAPE
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| 75 | CHARACTER*79 DSN
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| 76 | CHARACTER*20 HOST,USER
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| 77 |
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| 78 | LOGICAL DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 79 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 80 | * ,GHEISH,GHESIG
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| 81 | *KEND.
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| 82 |
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| 83 | DOUBLE PRECISION AA,ALE,ALFA,AL10T,A1,A1R,B,BETA1,CC,C1,C2,
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| 84 | * COSTH3,COSTH4,EKIN,EMUON,ENEG,EPOS,EPP,
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| 85 | * PHI3,PPOS,R0,R0MAX,SCREJ,SINTH3,
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| 86 | * TPOS,V,VC,VMAX,VMIN,V0,Z
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| 87 | INTEGER I
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| 88 | DATA AL10T/9.212D0/
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| 89 | C-----------------------------------------------------------------------
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| 90 |
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| 91 | IF ( DEBUG ) WRITE(MDEBUG,444) (CURPAR(I),I=1,9)
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| 92 | 444 FORMAT(' MUPRPR: CURPAR=',1P,9E10.3)
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| 93 |
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| 94 | C COPY COORDINATES TO SECPAR
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| 95 | DO 11 I = 5,8
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| 96 | SECPAR(I) = CURPAR(I)
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| 97 | 11 CONTINUE
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| 98 | SECPAR( 9) = GEN
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| 99 | C SET MATERIAL CONSTANTS CMUON(.) ACCORDING TO
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| 100 | C TARGET INDEX LT (1=N, 2=O, 3=AR) WHICH HAS BEEN SET IN BOX2
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| 101 | IF ( LT .EQ. 1 ) THEN
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| 102 | Z = 7.D0
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| 103 | ELSEIF ( LT .EQ. 2 ) THEN
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| 104 | Z = 8.D0
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| 105 | ELSE
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| 106 | Z = 18.D0
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| 107 | ENDIF
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| 108 | C TOTAL AND KINETIC ENERGY OF MUON
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| 109 | EMUON = PAMA(5) * GAMMA
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| 110 | EKIN = EMUON - PAMA(5)
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| 111 | IF ( EKIN .LE. BCUT ) GOTO 900
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| 112 | C
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| 113 | VMIN = 4.D0 * PAMA(2) / EMUON
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| 114 | VMAX = 1.D0 - CMUON(10) * Z**OB3 / EMUON
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| 115 | IF ( VMAX .LE. VMIN ) GOTO 900
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| 116 | VC = BCUT / EMUON
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| 117 | ALE = LOG(EMUON)
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| 118 | ALFA = 1.D0 + ALE/AL10T
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| 119 | V0 = 0.18D0 * (4.D0 + ALE/AL10T) * ALFA * (ALFA*VMIN)**TB3
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| 120 | BETA1 = 0.1D0 * (1.D0 + 3.D0 * ALE/AL10T)
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| 121 | B = 0.9D0 / (1.D0 + 0.4D0*ALE + 0.022D0*ALE**2)
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| 122 | AA = 1.D0 + 2.D0 * B * LOG(VC/V0)
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| 123 | IF ( AA .LE. 1.D0 ) AA = 1.05D0
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| 124 | A1 = 1.D0 - AA
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| 125 | CC = EXP(-0.25D0*A1*A1/B)
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| 126 | A1R = 1.D0 / A1
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| 127 | C1 = VMAX**A1
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| 128 | C2 = VC**A1
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| 129 | C SAMPLE ENERGY FRACTION V AND RO
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| 130 | 50 CALL RMMAR(RD,2,1)
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| 131 | V = ( RD(1)*C1 + (1.-RD(1))*C2 )**A1R
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| 132 | IF ( V .LE. VMIN ) GOTO 50
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| 133 | IF ( V .LT. V0 ) THEN
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| 134 | SCREJ = CC * ( (V-VMIN)/(V0-VMIN) )**BETA * (V0/V)**A1
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| 135 | ELSE
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| 136 | SCREJ = CC * (V0/V)**( A1 + B*LOG(V/V0) )
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| 137 | ENDIF
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| 138 | IF ( RD(2) .GT. SCREJ ) GOTO 50
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| 139 | R0MAX = SCREJ * ( 1.D0 - 6.D0 *PAMA(5)/( EMUON**2 * (1.D0-V) ) )
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| 140 | CALL RMMAR(RD,2,1)
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| 141 | R0 = R0MAX * (2.*RD(1)-1.)
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| 142 | C ENERGIES
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| 143 | EPP = V * EMUON
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| 144 | EPOS = 0.5D0 * EPP * (1.D0 + R0)
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| 145 | ENEG = EPP - EPOS
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| 146 | C ANGLES
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| 147 | COSTH3 = COS( PAMA(5)/EMUON )
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| 148 | PHI3 = PI2 * RD(2)
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| 149 | C POSITRON
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| 150 | IF ( EPOS .GT. BCUT+PAMA(3) ) THEN
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| 151 | CALL ADDANG( COSTHE,PHI, COSTH3,PHI3, SECPAR(3),SECPAR(4) )
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| 152 | IF ( SECPAR(3) .GT. C(29) ) THEN
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| 153 | SECPAR( 1) = 2.D0
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| 154 | SECPAR( 2) = EPOS/PAMA(2)
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| 155 | SECPAR(10) = H
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| 156 | CALL TSTACK
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| 157 | ENDIF
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| 158 | ENDIF
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| 159 | C ELECTRON
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| 160 | IF ( ENEG .GT. BCUT+PAMA(3) ) THEN
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| 161 | CALL ADDANG( COSTHE,PHI, COSTH3,-PHI3, SECPAR(3),SECPAR(4) )
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| 162 | IF ( SECPAR(3) .GT. C(29) ) THEN
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| 163 | SECPAR( 1) = 3.D0
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| 164 | SECPAR( 2) = ENEG/PAMA(2)
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| 165 | SECPAR(10) = H
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| 166 | CALL TSTACK
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| 167 | ENDIF
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| 168 | ENDIF
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| 169 | C REDUCE ENERGY OF MUON
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| 170 | 60 CONTINUE
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| 171 | GAMMA = (EMUON - EPP)/ PAMA(5)
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| 172 |
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| 173 | 900 CONTINUE
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| 174 | C WRITE MUON TO STACK
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| 175 | SECPAR( 1) = CURPAR(1)
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| 176 | SECPAR( 2) = GAMMA
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| 177 | SECPAR( 3) = CURPAR(3)
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| 178 | SECPAR( 4) = CURPAR(4)
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| 179 | SECPAR(10) = ALEVEL
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| 180 | CALL TSTACK
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| 181 |
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| 182 | RETURN
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| 183 | END
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