Geant4  10.00.p01
G4PionMinusField.cc
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 //
27 // -------------------------------------------------------------------
28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4PionMinusField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4PionMinusField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4NucleiProperties.hh"
43 #include "G4VNuclearDensity.hh"
44 #include "G4FermiMomentum.hh"
45 #include "G4PionMinus.hh"
46 #include "G4HadTmpUtil.hh"
47 
49  : G4VNuclearField(nucleus)
50 {
51  theCoeff = coeff;
52 }
53 
54 
56 { }
57 
59 {
60 // Field is 0 out of the nucleus!
61  if(aPosition.mag() >= radius) return 0.0;
62 
64  G4int Z = theNucleus->GetCharge();
65  G4double pionMinusMass = G4PionMinus::PionMinus()->GetPDGMass();
67  G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
68  G4double reducedMass = pionMinusMass*nucleusMass/(pionMinusMass+nucleusMass);
69 
71  G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
72 
73  return 2.*pi*hbarc*hbarc/reducedMass*(1+pionMinusMass/nucleonMass)*theCoeff*density + GetBarrier();
74 }
75 
76 
78 {
80  G4int Z = theNucleus->GetCharge();
81  G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + std::pow(A,1./3.));
82  return -coulombBarrier;
83 }
84 
85 
86 
87 
88 
89 
90 
91 
92 
93 
94 
95 
96 
97 
98 
99 
static const double MeV
Definition: G4SIunits.hh:193
virtual ~G4PionMinusField()
virtual G4int GetCharge()=0
CLHEP::Hep3Vector G4ThreeVector
virtual const G4VNuclearDensity * GetNuclearDensity() const =0
const G4double pi
virtual G4int GetMassNumber()=0
virtual G4double GetField(const G4ThreeVector &aPosition)
int G4int
Definition: G4Types.hh:78
G4double density
Definition: TRTMaterials.hh:39
G4PionMinusField(G4V3DNucleus *nucleus, G4double coeff=0.042 *CLHEP::fermi)
static const G4double A[nN]
const G4double radius
G4double GetPDGMass() const
G4double GetDensity(const G4ThreeVector &aPosition) const
static G4double GetBindingEnergy(const G4int A, const G4int Z)
int G4lrint(double ad)
Definition: templates.hh:163
static G4PionMinus * PionMinus()
Definition: G4PionMinus.cc:98
G4V3DNucleus * theNucleus
virtual G4double GetBarrier()
double G4double
Definition: G4Types.hh:76
G4double bindingEnergy(G4int A, G4int Z)