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Commit | Line | Data |
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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:21:55 cernlib | |
6 | * Geant | |
7 | * | |
8 | * | |
9 | #include "geant321/pilot.h" | |
10 | *CMZ : 3.21/04 23/02/95 14.46.01 by S.Giani | |
11 | *-- Author : | |
12 | SUBROUTINE CEVAP(E,Q,ATAR,CB,EX) | |
13 | C THIS ROUTINE SAMPLES AN EXIT ENERGY FROM AN | |
14 | C EVAPORATION SPECTRUM | |
15 | #include "geant321/minput.inc" | |
16 | SAVE | |
17 | C CONVERT THE COULOMB BARRIER (CB) TO UNITS OF EV | |
18 | CB=CB*1.00E+06 | |
19 | C CALCULATE THE MAXIMUM ENERGY AVAILABLE | |
20 | CBI=CB | |
21 | EMAX=E+Q-CB | |
22 | IF(EMAX.GT.0.0)GO TO 10 | |
23 | CB=0.5*CB | |
24 | EMAX=E+Q-CB | |
25 | IF(EMAX.GT.0.0)GO TO 10 | |
26 | CB=0.0 | |
27 | EMAX=E+Q-CB | |
28 | IF(EMAX.GT.0.0)GO TO 10 | |
29 | WRITE(IOUT,10000)E,EMAX,Q,CBI | |
30 | 10000 FORMAT(' MICAP: NEGATIVE MAXIMUM ENERGY CALCULATED IN ROUTINE ', | |
31 | 1'EVAP --- INDICATING PROBABLE CROSS SECTION ERROR ALLOWING ', | |
32 | 2'THE REACTION TO OCCUR',/,10X,'E,EMAX,Q,CB=',4E13.5) | |
33 | WRITE(6,*) ' CALOR: Fatal ERROR in EVAP ====> STOP ' | |
34 | STOP | |
35 | C CALCULATE THE NUCLEAR TEMPERATURE (THETA) | |
36 | 10 THETA=4.0161E+03*(SQRT(E+Q-CB)/(ATAR**0.8333333)) | |
37 | C SELECT THE EXIT ENERGY FROM AN EVAPORATION SPECTRUM | |
38 | 20 R1=FLTRNF(0) | |
39 | R2=FLTRNF(0) | |
40 | W=-ALOG(R1*R2) | |
41 | EX=THETA*W | |
42 | IF(EX.LT.0.0) EX = 0.0 | |
43 | IF(EX.LE.EMAX)RETURN | |
44 | C RESAMPLE 75% OF THE TIME IF EX IS GREATER THAN EMAX | |
45 | R=FLTRNF(0) | |
46 | IF(R.LE.0.75)GO TO 20 | |
47 | #if defined(CERNLIB_MDEBUG) | |
48 | IF(EX.GT.20.*EMAX) WRITE(IOUT,10100)EX,EMAX | |
49 | 10100 FORMAT(' MICAP: WARNING EX > EMAX=',2E13.5,' IN ROUTINE EVAP') | |
50 | #endif | |
51 | EX=EMAX | |
52 | RETURN | |
53 | END |