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*DECK MCGSCAT
SUBROUTINE MCGSCAT(N,K,M,NOM,NZON,H,XST,B)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Calculate coefficients of a track for the characteristics integration.
* Step-Characteristics scheme with tabulated exponential calls.
* MOCC/MCI integration strategy.
*
*Copyright:
* Copyright (C) 2002 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): R. Le Tellier
*
*Parameters: input
* N number of elements in the current track.
* K total number of volumes for which specific values
* of the neutron flux and reactions rates are required.
* M number of material mixtures.
* NOM vector containing the region number of the different segments
* of this track.
* NZON index-number of the mixture type assigned to each volume.
* H vector containing the lenght of the different segments of this
* track.
* XST macroscopic total cross section.
* and step characteristics (SC).
*
*Parameters: output
* B undefined.
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER N,K,M,NOM(N),NZON(K)
REAL XST(0:M)
DOUBLE PRECISION H(N),B(N)
*---
* LOCAL VARIABLES
*---
INTEGER I,NOMI,NZI
DOUBLE PRECISION TAUD
* tabulated exponential common block
REAL E0, E1, PAS1, DX1, XLIM1
INTEGER MEX1, LAU
PARAMETER ( MEX1=7936)
COMMON /EXP0/ E0(0:MEX1),E1(0:MEX1),PAS1,DX1,XLIM1
*
DO I=2,N-1
NOMI=NOM(I)
NZI=NZON(NOMI)
TAUD=H(I)*XST(NZI)
LAU=MIN(INT(TAUD*PAS1),MEX1)
B(I)=E0(LAU)+E1(LAU)*TAUD
ENDDO
*
RETURN
END
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