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Geant4/processes/hadronic/util/src/G4VHadPhaseSpaceAlgorithm.cc

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Diff markup

Differences between /processes/hadronic/util/src/G4VHadPhaseSpaceAlgorithm.cc (Version 11.3.0) and /processes/hadronic/util/src/G4VHadPhaseSpaceAlgorithm.cc (Version 11.0.p4)


  1 //                                                  1 //
  2 // *******************************************      2 // ********************************************************************
  3 // * License and Disclaimer                         3 // * License and Disclaimer                                           *
  4 // *                                                4 // *                                                                  *
  5 // * The  Geant4 software  is  copyright of th      5 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
  6 // * the Geant4 Collaboration.  It is provided      6 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
  7 // * conditions of the Geant4 Software License      7 // * conditions of the Geant4 Software License,  included in the file *
  8 // * LICENSE and available at  http://cern.ch/      8 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
  9 // * include a list of copyright holders.           9 // * include a list of copyright holders.                             *
 10 // *                                               10 // *                                                                  *
 11 // * Neither the authors of this software syst     11 // * Neither the authors of this software system, nor their employing *
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 15 // * use.  Please see the license in the file      15 // * use.  Please see the license in the file  LICENSE  and URL above *
 16 // * for the full disclaimer and the limitatio     16 // * for the full disclaimer and the limitation of liability.         *
 17 // *                                               17 // *                                                                  *
 18 // * This  code  implementation is the result      18 // * This  code  implementation is the result of  the  scientific and *
 19 // * technical work of the GEANT4 collaboratio     19 // * technical work of the GEANT4 collaboration.                      *
 20 // * By using,  copying,  modifying or  distri     20 // * By using,  copying,  modifying or  distributing the software (or *
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 24 // *******************************************     24 // ********************************************************************
 25 //                                                 25 //
 26 //                                                 26 //
 27 // Abstract base class for multibody uniform p     27 // Abstract base class for multibody uniform phase space generators.
 28 // Subclasses implement a specific algorithm,      28 // Subclasses implement a specific algorithm, such as Kopylov, GENBOD,
 29 // or Makoto's NBody.  Subclasses are used by      29 // or Makoto's NBody.  Subclasses are used by G4HadDecayGenerator.
 30 //                                                 30 //
 31 // Author:  Michael Kelsey (SLAC) <kelsey@slac     31 // Author:  Michael Kelsey (SLAC) <kelsey@slac.stanford.edu>
 32                                                    32 
 33 #include "G4VHadPhaseSpaceAlgorithm.hh"            33 #include "G4VHadPhaseSpaceAlgorithm.hh"
 34 #include "G4HadronicException.hh"                  34 #include "G4HadronicException.hh"
 35 #include "G4PhysicalConstants.hh"                  35 #include "G4PhysicalConstants.hh"
 36 #include "G4SystemOfUnits.hh"                      36 #include "G4SystemOfUnits.hh"
 37 #include "G4ThreeVector.hh"                        37 #include "G4ThreeVector.hh"
 38 #include "Randomize.hh"                            38 #include "Randomize.hh"
 39 #include <algorithm>                               39 #include <algorithm>
 40 #include <iostream>                                40 #include <iostream>
 41 #include <iterator>                                41 #include <iterator>
 42 #include <numeric>                                 42 #include <numeric>
 43 #include <vector>                                  43 #include <vector>
 44                                                    44 
 45                                                    45 
 46                                                    46 
 47                                                    47 
 48 // Two body decay with uniform angular distrib     48 // Two body decay with uniform angular distribution
 49                                                    49 
 50 void G4VHadPhaseSpaceAlgorithm::                   50 void G4VHadPhaseSpaceAlgorithm::
 51 GenerateTwoBody(G4double initialMass,              51 GenerateTwoBody(G4double initialMass,
 52     const std::vector<G4double>& masses,           52     const std::vector<G4double>& masses,
 53     std::vector<G4LorentzVector>& finalState)      53     std::vector<G4LorentzVector>& finalState) {
 54   if (GetVerboseLevel()>1)                         54   if (GetVerboseLevel()>1) 
 55     G4cout << " >>> G4HadDecayGenerator::FillT     55     G4cout << " >>> G4HadDecayGenerator::FillTwoBody" << G4endl;
 56                                                    56 
 57   // Initialization and sanity check               57   // Initialization and sanity check
 58   finalState.clear();                              58   finalState.clear();
 59   if (masses.size() != 2U) return;  // Should      59   if (masses.size() != 2U) return;  // Should not have been called
 60                                                    60 
 61   // Momentum of final state (energy balance h     61   // Momentum of final state (energy balance has already been checked)
 62   G4double p = TwoBodyMomentum(initialMass,mas     62   G4double p = TwoBodyMomentum(initialMass,masses[0],masses[1]);
 63   if (GetVerboseLevel()>2) G4cout << " finalSt     63   if (GetVerboseLevel()>2) G4cout << " finalState momentum = " << p << G4endl;
 64                                                    64 
 65   finalState.resize(2);       // Allows fillin     65   finalState.resize(2);       // Allows filling by index
 66   finalState[0].setVectM(UniformVector(p), mas     66   finalState[0].setVectM(UniformVector(p), masses[0]);
 67   finalState[1].setVectM(-finalState[0].vect()     67   finalState[1].setVectM(-finalState[0].vect(), masses[1]);
 68 }                                                  68 }
 69                                                    69 
 70                                                    70 
 71 // Samples a random vector with given magnitud     71 // Samples a random vector with given magnitude
 72                                                    72 
 73 G4ThreeVector G4VHadPhaseSpaceAlgorithm::Unifo     73 G4ThreeVector G4VHadPhaseSpaceAlgorithm::UniformVector(G4double mag) const {
 74   // FIXME:  Should this be made a static thre     74   // FIXME:  Should this be made a static thread-local buffer?
 75   G4ThreeVector v;                                 75   G4ThreeVector v;
 76   v.setRThetaPhi(mag, UniformTheta(), UniformP     76   v.setRThetaPhi(mag, UniformTheta(), UniformPhi());
 77   return v;                                        77   return v;
 78 }                                                  78 }
 79                                                    79