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CWeight.cpp
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CWeight.cpp
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#include "CWeight.h"
float const fact0=0.3;
//****************************************************************************
/**
* Determines the degree of weighting for enhance IMF emission
\param gammaLight decay width for light-particle evaporation (MeV)
\param gammaImf decay width for IMF emission (MeV)
\param gammaFission Fission decay width (MeV)
\param gammaGamma Gamma-ray decay width
*/
void CWeight::findFactor(float gammaLight, float gammaImf, float gammaFission,
float gammaGamma)
{
if (gammaImf <= 0.)
{
fact = 1.;
iWeight = 0;
return;
}
if (gammaLight+gammaFission+gammaGamma <=0.)
{
fact = 1.;
iWeight = 0;
return;
}
float gammaTot = gammaLight+gammaImf+gammaFission+gammaGamma;
fact = fact0*(gammaTot-gammaImf)/(1.-fact0)/gammaImf;
if (fact < 1.)fact = 1.;
}
//*********************************************************
/**
* Chooses the decay channel given the decay widths.
* If IMF weighting is truned on, then IMF emission is enhanced and
* a running weight is calculated.
\param gammaLight decay width for light-particle evaporation (MeV)
\param gammaImf decay width for IMF emission (MeV)
\param gammaFission Fission decay width (MeV)
\param gammaGamma Gamma-ray decay width
\param xran Random number
*/
int CWeight::chooseChannel(float gammaLight, float gammaImf,
float gammaFission, float gammaGamma, float xran)
{
if (iWeight == 1) findFactor(gammaLight,gammaImf,gammaFission,gammaGamma);
float fact1 = 1.;
if (iWeight) fact1 = fact; //weighting turned on
float Gamma_real = gammaLight + gammaImf + gammaFission + gammaGamma;
float Gamma_weight = gammaLight + gammaImf*fact1 + gammaFission + gammaGamma;
float probLight = gammaLight/Gamma_weight;
float probImf = gammaImf*fact1/Gamma_weight + probLight;
float probFission = gammaFission/Gamma_weight + probImf;
//no need of weighting if only imf emission
if (gammaLight + gammaFission + gammaGamma <=0.) Gamma_weight = Gamma_real;
int iChan;
if (xran < probLight)
{
iChan = 0;
runningWeight *= Gamma_weight/Gamma_real;
if (iWeight > 0)iWeight++;
}
else if (xran < probImf)
{
iChan = 1;
runningWeight *= Gamma_weight/fact1/Gamma_real;
iWeight = 0; //turn weighting off for rest of event
}
else if (xran < probFission)
{
iChan =2;
runningWeight *= Gamma_weight/Gamma_real;
iWeight = 0; //turn weighting off for the rest of the event
}
else
{
iChan =3; //gamma ray emission
runningWeight *= Gamma_weight/Gamma_real;
iWeight = 0; //turn weighting off for the rest of the event
}
return iChan;
}
//************************************************************************
/**
* turns on IMF weighting, i.e. emhanced IMF emissions
*/
void CWeight::setWeightIMF()
{
iWeight = 1;
}
//**********************************************************************
/**
* When IMF weighting is turn on, this routine returns the weighting factor
* which should be used to increment all histograms. If weighting is turned
* off, then unity is returned
*/
float CWeight::getWeightFactor()
{
return runningWeight;
}

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CWeight.cpp (3 KB)

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