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This commit is contained in:
Gabriele Cosmo
2016-06-09 10:56:29 +02:00
parent 1d812b78b1
commit e083ffb441
1415 changed files with 111223 additions and 21207 deletions
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source/processes/hadronic/models/im_r_matrix/src/G4Scatterer.cc
+47 -37
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@@ -20,7 +20,7 @@
// * statement, and all its terms. *
// ********************************************************************
//
// $Id: G4Scatterer.cc,v 1.13.2.1 2004/03/24 13:18:45 hpw Exp $ //
// $Id: G4Scatterer.cc,v 1.13.2.2 2004/05/07 15:09:21 gunter Exp $ //
//
#include "globals.hh"
@@ -58,36 +58,49 @@ G4Scatterer::~G4Scatterer()
collisions.clear();
}
G4double G4Scatterer::GetTimeToInteraction(const G4KineticTrack& trk1,
const G4KineticTrack& trk2)
{
G4double time = DBL_MAX;
G4double distance_fast;
G4LorentzVector mom1 = trk1.GetTrackingMomentum();
// G4cout << "zcomp=" << abs(mom1.vect().unit().z() -1 ) << G4endl;
G4double collisionTime;
G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
// Check whether there is enough energy for elastic scattering
// (to put the particles on to mass shell
if ( abs(mom1.vect().unit().z() -1 ) < 1e-6 )
{
G4ThreeVector position = trk2.GetPosition() - trk1.GetPosition();
G4double deltaz=position.z();
G4double velocity = mom1.z()/mom1.e() * c_light;
collisionTime=deltaz/velocity;
distance_fast=position.x()*position.x() + position.y()*position.y();
} else {
// if (trk1.GetDefinition()->GetPDGMass() + trk2.GetDefinition()->GetPDGMass() < sqrtS)
if (trk1.GetActualMass() + trk2.GetActualMass() < sqrtS)
{
G4LorentzVector mom1 = trk1.GetTrackingMomentum();
// The nucleons of the nucleus are FROZEN, ie. do not move..
G4ThreeVector position = trk1.GetPosition() - trk2.GetPosition();
// The nucleons of the nucleus are FROZEN, ie. do not move..
// G4ThreeVector velocity = (mom1.boostVector() - mom2.boostVector()) * c_light;
if ( mom1.mag2() < -1.*eV )
{
G4cout << "G4Scatterer::GetTimeToInteraction(): negative m2:" << mom1.mag2() << G4endl;
}
G4ThreeVector velocity = mom1.vect()/mom1.e() * c_light;
G4double collisionTime = - (position * velocity) / (velocity * velocity); // can't divide by /c_light;
G4ThreeVector position = trk2.GetPosition() - trk1.GetPosition();
G4ThreeVector velocity = mom1.vect()/mom1.e() * c_light; // mom1.boostVector() will exit on slightly negative mass
collisionTime = (position * velocity) / velocity.mag2(); // can't divide by /c_light;
position -= velocity * collisionTime;
distance_fast=position.mag2();
// if ( collisionTime>0 ) G4cout << " dis1/2 square" << dis1 <<" "<< dis2 << G4endl;
// collisionTime = GetTimeToClosestApproach(trk1,trk2);
}
if (collisionTime > 0)
{
static const G4double maxCrossSection = 500*millibarn;
if(0.7*pi*distance_fast>maxCrossSection) return time;
G4LorentzVector mom2(0,0,0,trk2.Get4Momentum().mag());
// G4ThreeVector momLab = mom1.vect();// frozen Nucleus - mom2.vect();
// G4ThreeVector posLab = trk1.GetPosition() - trk2.GetPosition();
// G4double disLab=posLab * posLab - (posLab*momLab) * (posLab*momLab) /(momLab.mag2());
G4LorentzRotation toCMSFrame((-1)*(mom1 + mom2).boostVector());
mom1 = toCMSFrame * mom1;
mom2 = toCMSFrame * mom2;
@@ -101,9 +114,16 @@ G4double G4Scatterer::GetTimeToInteraction(const G4KineticTrack& trk1,
// Calculate the impact parameter
G4double distance = pos * pos - (pos*mom) * (pos*mom) / (mom*mom);
G4double distance = pos * pos - (pos*mom) * (pos*mom) / (mom.mag2());
// G4cout << " disDiff " << distance-disLab << " " << disLab
// << " " << abs(distance-disLab)/distance << G4endl
// << " mom/Lab " << mom << " " << momLab << G4endl
// << " pos/Lab " << pos << " " << posLab
// << G4endl;
// global optimization
static const G4double maxCrossSection = 500*millibarn;
// static const G4double maxCrossSection = 500*millibarn;
if(pi*distance>maxCrossSection) return time;
// charged particles special
@@ -112,6 +132,7 @@ G4double G4Scatterer::GetTimeToInteraction(const G4KineticTrack& trk1,
abs(trk2.GetDefinition()->GetPDGCharge())>0.1 &&
pi*distance>maxChargedCrossSection) return time;
G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
// neutrons special
if(( trk1.GetDefinition() == G4Neutron::Neutron() ||
trk1.GetDefinition() == G4Neutron::Neutron() ) &&
@@ -149,6 +170,9 @@ G4double G4Scatterer::GetTimeToInteraction(const G4KineticTrack& trk1,
* if(1)
* return time;
*/
if ((trk1.GetActualMass()+trk2.GetActualMass()) > sqrtS) return time;
G4VCollision* collision = FindCollision(trk1,trk2);
@@ -229,20 +253,6 @@ G4double G4Scatterer::GetTimeToInteraction(const G4KineticTrack& trk1,
// End of debugging
*/
}
}
else
{
/*
// For debugging
G4cout << "G4Scatterer - Infinite time to interaction"
<< ": sqrtS " << sqrtS
<< ", mass1 = " << trk1.GetDefinition()->GetPDGMass()
<< ", mass2 = " << trk2.GetDefinition()->GetPDGMass()
<< G4endl;
throw G4HadronicException(__FILE__, __LINE__, "G4Scatterer TimeToInteraction is INF");
// End of debugging
*/
}
return time;
}