Import Geant4 4.0.0 source tree

2016-06-08 16:18:25 +02:00
parent 36c080dca6
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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * 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.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * authors in the GEANT4 collaboration.                             *
+// * By copying,  distributing  or modifying the Program (or any work *
+// * based  on  the Program)  you indicate  your  acceptance of  this *
+// * statement, and all its terms.                                    *
+// ********************************************************************
+//
+//
+// $Id: G4SampleResonance.cc,v 1.4 2001/10/06 08:17:02 hpw Exp $
+// GEANT4 tag $Name: geant4-04-00 $
+//
+// ------------------------------------------------------------
+//      GEANT 4 class header file
+//
+//      ---------------- G4SampleResonance ----------------
+//             by Henning Weber, March 2001.
+//      helper class for sampling resonance masses
+// ------------------------------------------------------------
+
+
+#include "globals.hh"
+#include "g4std/iostream"
+#include "G4SampleResonance.hh"
+#include "G4DecayTable.hh"
+#include "Randomize.hh"
+
+
+G4SampleResonance::minMassMapType G4SampleResonance::minMassCache;
+
+G4double G4SampleResonance::GetMinimumMass(const G4ParticleDefinition* p) const
+{
+  
+  G4double minResonanceMass = DBL_MAX;
+
+  if ( p->IsShortLived() ) 
+    {
+      minMassMapIterator i = minMassCache.find(p);
+      if ( i!=minMassCache.end() ) 
+	{
+	  minResonanceMass = (*i).second; 
+	} 
+      else 
+	{
+	  // G4cout << "--> request for " << p->GetParticleName() << G4endl;
+
+	  const G4DecayTable* theDecays = const_cast<G4ParticleDefinition*>(p)->GetDecayTable();
+	  const G4int nDecays = theDecays->entries();
+      
+	  for (G4int i=0; i<nDecays; i++) 
+	    {
+	      const G4VDecayChannel* aDecay = theDecays->GetDecayChannel(i);
+	      const G4int nDaughters = aDecay->GetNumberOfDaughters();
+	      
+	      G4double minChannelMass = 0;
+	      
+	      for (G4int j=0; j<nDaughters; j++) 
+		{
+		  const G4ParticleDefinition* aDaughter = const_cast<G4VDecayChannel*>(aDecay)->GetDaughter(j);
+		  G4double minMass = GetMinimumMass(aDaughter);
+		  if (!minMass) minMass = DBL_MAX; // exclude gamma channel;
+		  minChannelMass+=minMass;
+		}
+	      // G4cout << "channel mass for the above is " << minChannelMass/MeV << G4endl;
+	      if (minChannelMass < minResonanceMass) minResonanceMass = minChannelMass;
+	      
+	    }
+	  // replace this as soon as the compiler supports mutable!!
+	  G4SampleResonance* self = const_cast<G4SampleResonance*>(this);
+	  (self->minMassCache)[p] = minResonanceMass;
+	  
+	}
+    } 
+  else 
+    {
+    
+      minResonanceMass = p->GetPDGMass();
+      
+    }
+  // G4cout << "minimal mass for " << p->GetParticleName() << " is " << minResonanceMass/MeV << G4endl;
+  
+  return minResonanceMass;
+} 
+      
+
+
+G4double G4SampleResonance::SampleMass(const G4ParticleDefinition* p, const G4double maxMass) const
+{
+  return SampleMass(p->GetPDGMass(), p->GetPDGWidth(), GetMinimumMass(p), maxMass);
+}
+
+
+G4double G4SampleResonance::SampleMass(const G4double poleMass, 
+				       const G4double gamma,
+				       const G4double minMass,
+				       const G4double maxMass) const
+{
+  // Chooses a mass randomly between minMass and maxMass 
+  //     according to a Breit-Wigner function with constant 
+  //     width gamma and pole poleMass
+
+  if ( minMass > maxMass ) 
+    {
+      G4Exception("SampleResonanceMass: mass range negative (minMass>maxMass)");
+    }
+
+  G4double returnMass;
+
+  if ( gamma < DBL_EPSILON ) 
+    {
+      returnMass = G4std::max(minMass, G4std::min(maxMass, poleMass));
+    } 
+  else 
+    {
+      double fmin = BrWigInt0(minMass, gamma, poleMass);
+      double fmax = BrWigInt0(maxMass, gamma, poleMass);
+      double f = fmin + (fmax-fmin)*G4UniformRand();
+      returnMass = BrWigInv(f, gamma, poleMass);      
+    }
+
+  return returnMass;
+}
+
+
+
+