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File indexing completed on 2025-01-18 09:58:04
0001 // 0002 // ******************************************************************** 0003 // * License and Disclaimer * 0004 // * * 0005 // * The Geant4 software is copyright of the Copyright Holders of * 0006 // * the Geant4 Collaboration. It is provided under the terms and * 0007 // * conditions of the Geant4 Software License, included in the file * 0008 // * LICENSE and available at http://cern.ch/geant4/license . These * 0009 // * include a list of copyright holders. * 0010 // * * 0011 // * Neither the authors of this software system, nor their employing * 0012 // * institutes,nor the agencies providing financial support for this * 0013 // * work make any representation or warranty, express or implied, * 0014 // * regarding this software system or assume any liability for its * 0015 // * use. Please see the license in the file LICENSE and URL above * 0016 // * for the full disclaimer and the limitation of liability. * 0017 // * * 0018 // * This code implementation is the result of the scientific and * 0019 // * technical work of the GEANT4 collaboration. * 0020 // * By using, copying, modifying or distributing the software (or * 0021 // * any work based on the software) you agree to acknowledge its * 0022 // * use in resulting scientific publications, and indicate your * 0023 // * acceptance of all terms of the Geant4 Software license. * 0024 // ******************************************************************** 0025 // 0026 // 0027 //--------------------------------------------------------------------------- 0028 // 0029 // ClassName: G4CRCoalescence ("CR" stands for "Cosmic Ray") 0030 // 0031 // Author: 2020 Alberto Ribon , based on code written by 0032 // Diego Mauricio Gomez Coral for the GAPS Collaboration 0033 // 0034 // Description: This class can be optionally used in the method: 0035 // 0036 // G4TheoFSGenerator::ApplyYourself 0037 // 0038 // to coalesce pairs of proton-neutron and antiproton-antineutron 0039 // into deuterons and antideuterons, respectively, from the list 0040 // of secondaries produced by a string model. 0041 // This class can be useful in particular for Cosmic Ray (CR) 0042 // applications. 0043 // By default, this class is not used. 0044 // However, it can be enabled via the UI command: 0045 // 0046 // /process/had/enableCRCoalescence true 0047 // 0048 // It is assumed that the candidate proton-neutron and 0049 // antiproton-antideuteron pairs originate from the same 0050 // spatial position, so the condition for coalescence takes 0051 // into account only their closeness in momentum space. 0052 // 0053 // This class is based entirely on code written by 0054 // Diego Mauricio Gomez Coral for the GAPS Collaboration. 0055 // The main application of this work is for cosmic ray physics. 0056 // 0057 // Notes: 0058 // - In its current version, coalescence can occur only for 0059 // proton projectile (because the coalescence parameters 0060 // for deuteron and antideuteron are set to non-null values 0061 // only for the case of proton projectile). 0062 // - This class is not meant be used for secondaries produces 0063 // by intranuclear cascade models - such as BERT, BIC and 0064 // INCL - which should have already a coalescence phase. 0065 // 0066 // Modified: 0067 // 0068 //---------------------------------------------------------------------------- 0069 // 0070 #ifndef G4CRCoalescence_h 0071 #define G4CRCoalescence_h 1 0072 0073 #include "G4ReactionProductVector.hh" 0074 #include "G4HadProjectile.hh" 0075 #include "G4HadronicInteraction.hh" 0076 0077 class G4CRCoalescence : public G4HadronicInteraction { 0078 public: 0079 0080 explicit G4CRCoalescence(); 0081 ~G4CRCoalescence() override; 0082 G4CRCoalescence( const G4CRCoalescence &right ) = delete; 0083 const G4CRCoalescence & operator=( const G4CRCoalescence &right ) = delete; 0084 G4bool operator==( const G4CRCoalescence &right ) const = delete; 0085 G4bool operator!=( const G4CRCoalescence &right ) const = delete; 0086 0087 // Set the parameter used in the coalescence condition 0088 void SetP0Coalescence( const G4HadProjectile &thePrimary, G4String /* model */ ); 0089 0090 // Main method: form deuterons and antideuterons by coalescence of, respectively, 0091 // proton-neutron and antiproton-antineutron pairs with close momenta 0092 void GenerateDeuterons( G4ReactionProductVector* result ); 0093 0094 private: 0095 0096 // Utility methods 0097 void PushDeuteron( const G4ThreeVector &p1, const G4ThreeVector &p2, G4int charge, 0098 G4ReactionProductVector* result ); 0099 G4int FindPartner( const G4ThreeVector &p1, G4double m1, 0100 std::vector< std::pair< G4int, G4ThreeVector > > &neutron, 0101 G4double m2, G4int charge ); 0102 G4bool Coalescence( const G4ThreeVector &p1, G4double m1, 0103 const G4ThreeVector &p2, G4double m2, G4int charge ); 0104 G4bool Coalescence( G4double p1x, G4double p1y, G4double p1z, G4double m1, 0105 G4double p2x, G4double p2y, G4double p2z, G4double m2, G4int charge ); 0106 G4double GetPcm( const G4ThreeVector& p1, G4double m1, 0107 const G4ThreeVector& p2, G4double m2 ); 0108 G4double GetPcm( G4double p1x, G4double p1y, G4double p1z, G4double m1, 0109 G4double p2x, G4double p2y, G4double p2z, G4double m2 ); 0110 G4double GetS( G4double p1x, G4double p1y, G4double p1z, G4double m1, 0111 G4double p2x, G4double p2y, G4double p2z, G4double m2 ); 0112 0113 G4double fP0_d; // Coalescence parameter for deuterons 0114 G4double fP0_dbar; // Coalescence parameter for antideuterons 0115 0116 G4int secID; // Creator model ID for the secondaries created by this model 0117 }; 0118 0119 #endif
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