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Correction of the acollinearity sampling following Toussaint et al. #762

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Correction of the acollinearity sampling following Toussaint et al. #762

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21 changes: 15 additions & 6 deletions source/physics/src/GateBackToBack.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -52,12 +52,21 @@ void GateBackToBack::GenerateVertex( G4Event* aEvent, G4bool accolinearityFlag)
if (accoValue == 0.0){
accoValue = 0.5*pi / 180;
}

G4double dev = CLHEP::RandGauss::shoot( 0.,accoValue / GateConstants::fwhm_to_sigma );
G4double Phi1 = ( twopi * G4UniformRand() )/2. ;

G4ThreeVector DirectionPhoton( sin( dev ) * cos( Phi1 ),
sin( dev ) * sin( Phi1 ), cos( dev ) );

// Adapt the correction suggested by Toussaint et al. (https://doi.org/10.1088/1361-6560/ad70f1)

// G4double dev = CLHEP::RandGauss::shoot( 0.,accoValue / GateConstants::fwhm_to_sigma );
// G4double Phi1 = ( twopi * G4UniformRand() )/2. ;
//
// G4ThreeVector DirectionPhoton( sin( dev ) * cos( Phi1 ),
// sin( dev ) * sin( Phi1 ), cos( dev ) );

G4double phi = CLHEP::RandGauss::shoot(0., accoValue / GateConstants::fwhm_to_sigma);
G4double psi = CLHEP::RandGauss::shoot(0., accoValue / GateConstants::fwhm_to_sigma);

G4double theta = sqrt(pow(phi, 2.0) + pow(psi, 2.0));

G4ThreeVector DirectionPhoton(sin(theta) * phi / theta, sin(theta) * psi / theta, cos(theta));

// Scale vector to unit length before rotation, re-scale to original length after rotation:
G4double gammaMom_mag = gammaMom.mag();
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