Import Geant4 9.1.0 source tree
This commit is contained in:
Gabriele Cosmo
@@ -0,0 +1,224 @@
|
||||
//
|
||||
// ********************************************************************
|
||||
// * License and Disclaimer *
|
||||
// * *
|
||||
// * The Geant4 software is copyright of the Copyright Holders of *
|
||||
// * the Geant4 Collaboration. It is provided under the terms and *
|
||||
// * conditions of the Geant4 Software License, included in the file *
|
||||
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
||||
// * include a list of copyright holders. *
|
||||
// * *
|
||||
// * Neither the authors of this software system, nor their employing *
|
||||
// * institutes,nor the agencies providing financial support for this *
|
||||
// * work make any representation or warranty, express or implied, *
|
||||
// * regarding this software system or assume any liability for its *
|
||||
// * use. Please see the license in the file LICENSE and URL above *
|
||||
// * for the full disclaimer and the limitation of liability. *
|
||||
// * *
|
||||
// * This code implementation is the result of the scientific and *
|
||||
// * technical work of the GEANT4 collaboration. *
|
||||
// * By using, copying, modifying or distributing the software (or *
|
||||
// * any work based on the software) you agree to acknowledge its *
|
||||
// * use in resulting scientific publications, and indicate your *
|
||||
// * acceptance of all terms of the Geant4 Software license. *
|
||||
// ********************************************************************
|
||||
//
|
||||
// ------------------------------------------------------------
|
||||
// GEANT 4 class header file
|
||||
//
|
||||
// History:
|
||||
// 01 August 2007 P.Gumplinger
|
||||
// Reference: TRIUMF PIENU Technote:
|
||||
// M. Blecher - "Inclusion of pi->enug in MC "
|
||||
// Rate is for gammas > 100keV
|
||||
//
|
||||
// ------------------------------------------------------------
|
||||
//
|
||||
//
|
||||
//
|
||||
|
||||
#include "G4PionRadiativeDecayChannel.hh"
|
||||
|
||||
#include "Randomize.hh"
|
||||
#include "G4DecayProducts.hh"
|
||||
#include "G4LorentzVector.hh"
|
||||
|
||||
G4PionRadiativeDecayChannel::
|
||||
G4PionRadiativeDecayChannel(const G4String& theParentName,
|
||||
G4double theBR)
|
||||
: G4VDecayChannel("Radiative Pion Decay",1)
|
||||
{
|
||||
// set names for daughter particles
|
||||
if (theParentName == "pi+") {
|
||||
SetBR(theBR);
|
||||
SetParent("pi+");
|
||||
SetNumberOfDaughters(3);
|
||||
SetDaughter(0, "e+");
|
||||
SetDaughter(1, "gamma");
|
||||
SetDaughter(2, "nu_e");
|
||||
} else if (theParentName == "pi-") {
|
||||
SetBR(theBR);
|
||||
SetParent("pi-");
|
||||
SetNumberOfDaughters(3);
|
||||
SetDaughter(0, "e-");
|
||||
SetDaughter(1, "gamma");
|
||||
SetDaughter(2, "anti_nu_e");
|
||||
} else {
|
||||
#ifdef G4VERBOSE
|
||||
if (GetVerboseLevel()>0) {
|
||||
G4cout << "G4RadiativePionDecayChannel:: constructor :";
|
||||
G4cout << " parent particle is not muon but ";
|
||||
G4cout << theParentName << G4endl;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
beta = 3.6612e-03;
|
||||
|
||||
cib = 1.16141e-03;
|
||||
csdp = 3.45055e-02;
|
||||
csdm = 5.14122e-03;
|
||||
cif = 4.63543e-05;
|
||||
cig = 1.78928e-05;
|
||||
|
||||
xl = 2.*0.1*MeV/139.57*MeV;
|
||||
yl = ((1.-xl) + std::sqrt((1-xl)*(1-xl)+4*beta*beta))/2.;
|
||||
|
||||
xu = 1. - (yl - std::sqrt(yl*yl-4.*beta*beta))/2.;
|
||||
yu = 1. + beta*beta;
|
||||
|
||||
d2wmax = D2W(xl,yl);
|
||||
|
||||
}
|
||||
|
||||
G4PionRadiativeDecayChannel::~G4PionRadiativeDecayChannel()
|
||||
{
|
||||
}
|
||||
|
||||
G4DecayProducts *G4PionRadiativeDecayChannel::DecayIt(G4double)
|
||||
{
|
||||
|
||||
#ifdef G4VERBOSE
|
||||
if (GetVerboseLevel()>1)
|
||||
G4cout << "G4PionRadiativeDecayChannel::DecayIt ";
|
||||
#endif
|
||||
|
||||
if (parent == 0) FillParent();
|
||||
if (daughters == 0) FillDaughters();
|
||||
|
||||
// parent mass
|
||||
G4double parentmass = parent->GetPDGMass();
|
||||
|
||||
G4double EMPI = parentmass;
|
||||
|
||||
//daughters'mass
|
||||
G4double daughtermass[3];
|
||||
G4double sumofdaughtermass = 0.0;
|
||||
for (G4int index=0; index<3; index++){
|
||||
daughtermass[index] = daughters[index]->GetPDGMass();
|
||||
sumofdaughtermass += daughtermass[index];
|
||||
}
|
||||
|
||||
G4double EMASS = daughtermass[0];
|
||||
|
||||
//create parent G4DynamicParticle at rest
|
||||
G4ThreeVector dummy;
|
||||
G4DynamicParticle * parentparticle =
|
||||
new G4DynamicParticle( parent, dummy, 0.0);
|
||||
//create G4Decayproducts
|
||||
G4DecayProducts *products = new G4DecayProducts(*parentparticle);
|
||||
delete parentparticle;
|
||||
|
||||
G4double x, y, d2w;
|
||||
|
||||
do {
|
||||
|
||||
do {
|
||||
|
||||
x = xl + G4UniformRand()*(xu-xl);
|
||||
y = yl + G4UniformRand()*(yu-yl);
|
||||
|
||||
} while (x+y <= 1.);
|
||||
|
||||
d2w = D2W(x,y);
|
||||
|
||||
} while (d2w <= G4UniformRand()*d2wmax);
|
||||
|
||||
//-----------------------------------------------------------------------
|
||||
//
|
||||
// Calculate the angle between positron and photon (cosine)
|
||||
//
|
||||
G4double cthetaGE = (y*(x-2.)+2.*(1.-x+beta*beta)) /
|
||||
(x*std::sqrt(y*y-4.*beta*beta));
|
||||
|
||||
//
|
||||
//-----------------------------------------------------------------------
|
||||
//
|
||||
G4double G = x * EMPI/2.;
|
||||
G4double E = y * EMPI/2.;
|
||||
//
|
||||
//-----------------------------------------------------------------------
|
||||
//
|
||||
|
||||
if (E < EMASS) E = EMASS;
|
||||
|
||||
// calculate daughter momentum
|
||||
G4double daughtermomentum[2];
|
||||
|
||||
daughtermomentum[0] = std::sqrt(E*E - EMASS*EMASS);
|
||||
|
||||
G4double cthetaE = 2.*G4UniformRand()-1.;
|
||||
G4double sthetaE = std::sqrt(1.-cthetaE*cthetaE);
|
||||
|
||||
G4double phiE = twopi*G4UniformRand()*rad;
|
||||
G4double cphiE = std::cos(phiE);
|
||||
G4double sphiE = std::sin(phiE);
|
||||
|
||||
//Coordinates of the decay positron
|
||||
|
||||
G4double px = sthetaE*cphiE;
|
||||
G4double py = sthetaE*sphiE;
|
||||
G4double pz = cthetaE;
|
||||
|
||||
G4ThreeVector direction0(px,py,pz);
|
||||
|
||||
G4DynamicParticle * daughterparticle0
|
||||
= new G4DynamicParticle( daughters[0], daughtermomentum[0]*direction0);
|
||||
|
||||
products->PushProducts(daughterparticle0);
|
||||
|
||||
daughtermomentum[1] = G;
|
||||
|
||||
G4double sthetaGE = std::sqrt(1.-cthetaGE*cthetaGE);
|
||||
|
||||
G4double phiGE = twopi*G4UniformRand()*rad;
|
||||
G4double cphiGE = std::cos(phiGE);
|
||||
G4double sphiGE = std::sin(phiGE);
|
||||
|
||||
//Coordinates of the decay gamma with respect to the decay positron
|
||||
|
||||
px = sthetaGE*cphiGE;
|
||||
py = sthetaGE*sphiGE;
|
||||
pz = cthetaGE;
|
||||
|
||||
G4ThreeVector direction1(px,py,pz);
|
||||
|
||||
direction1.rotateUz(direction0);
|
||||
|
||||
G4DynamicParticle * daughterparticle1
|
||||
= new G4DynamicParticle( daughters[1], daughtermomentum[1]*direction1);
|
||||
|
||||
products->PushProducts(daughterparticle1);
|
||||
|
||||
// output message
|
||||
#ifdef G4VERBOSE
|
||||
if (GetVerboseLevel()>1) {
|
||||
G4cout << "G4PionRadiativeDecayChannel::DecayIt ";
|
||||
G4cout << " create decay products in rest frame " <<G4endl;
|
||||
products->DumpInfo();
|
||||
}
|
||||
#endif
|
||||
|
||||
return products;
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user