Geant4 9.6.0
Toolkit for the simulation of the passage of particles through matter
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G4INCLCoulombNonRelativistic.hh
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25//
26// INCL++ intra-nuclear cascade model
27// Pekka Kaitaniemi, CEA and Helsinki Institute of Physics
28// Davide Mancusi, CEA
29// Alain Boudard, CEA
30// Sylvie Leray, CEA
31// Joseph Cugnon, University of Liege
32//
33// INCL++ revision: v5.1.8
34//
35#define INCLXX_IN_GEANT4_MODE 1
36
37#include "globals.hh"
38
39/** \file G4INCLCoulombNonRelativistic.hh
40 * \brief Class for non-relativistic Coulomb distortion.
41 *
42 * \date 14 February 2011
43 * \author Davide Mancusi
44 */
45
46#ifndef G4INCLCOULOMBNONRELATIVISTIC_HH_
47#define G4INCLCOULOMBNONRELATIVISTIC_HH_
48
49#include "G4INCLParticle.hh"
50#include "G4INCLNucleus.hh"
51#include "G4INCLICoulomb.hh"
52#include "G4INCLCoulombNone.hh"
53#include "G4INCLGlobals.hh"
54
55namespace G4INCL {
56
58 public:
61
62 /** \brief Modify the momentum of the particle and position it on the
63 * surface of the nucleus.
64 *
65 * This method performs non-relativistic distortion.
66 *
67 * \param p incoming particle
68 * \param n distorting nucleus
69 **/
70 ParticleEntryAvatar *bringToSurface(Particle * const p, Nucleus * const n) const;
71
72 /** \brief Modify the momentum of the incoming cluster and position it on
73 * the surface of the nucleus.
74 *
75 * This method performs non-relativistic distortion. The momenta of the
76 * particles that compose the cluster are also distorted.
77 *
78 * \param c incoming cluster
79 * \param n distorting nucleus
80 **/
81 IAvatarList bringToSurface(Cluster * const c, Nucleus * const n) const;
82
83 /** \brief Modify the momenta of the outgoing particles.
84 *
85 * This method performs non-relativistic distortion.
86 *
87 * \param pL list of outgoing particles
88 * \param n distorting nucleus
89 */
90 void distortOut(ParticleList const &pL, Nucleus const * const n) const;
91
92 /** \brief Return the maximum impact parameter for Coulomb-distorted
93 * trajectories. **/
94 G4double maxImpactParameter(ParticleSpecies const &p, const G4double kinE, Nucleus const *
95 const n) const;
96
97 private:
98 /// \brief Return the maximum impact parameter for Coulomb-distorted trajectories.
99 G4double maxImpactParameterParticle(ParticleSpecies const &p, const G4double kinE, Nucleus const *
100 const n) const;
101
102 /// \brief Return the minimum distance of approach in a head-on collision (b=0).
103 G4double minimumDistance(ParticleSpecies const &p, const G4double kineticEnergy, Nucleus const * const n) const {
104 const G4double particleMass = ParticleTable::getTableSpeciesMass(p);
105 const G4double nucleusMass = n->getTableMass();
106 const G4double reducedMass = particleMass*nucleusMass/(particleMass+nucleusMass);
107 return ParticleTable::eSquared * p.theZ * n->getZ() * particleMass
108 / (kineticEnergy * reducedMass);
109 }
110
111 /// \brief Return the minimum distance of approach in a head-on collision (b=0).
112 G4double minimumDistance(Particle const * const p, Nucleus const * const n) const {
113 return minimumDistance(p->getSpecies(), p->getKineticEnergy(), n);
114 }
115
116 /** \brief Perform Coulomb deviation
117 *
118 * Modifies the entrance angle of the particle and its impact parameter.
119 * Can be applied to Particles and Clusters.
120 *
121 * The trajectory for an asymptotic impact parameter \f$b\f$ is
122 * parametrised as follows:
123 * \f[
124 * r(\theta) = \frac{(1-e^2)r_0/2}{1-e \sin(\theta-\theta_R/2)},
125 * \f]
126 * here \f$e\f$ is the hyperbola eccentricity:
127 * \f[
128 * e = \sqrt{1+4b^2/r_0^2};
129 * \f]
130 * \f$\theta_R\f$ is the Rutherford scattering angle:
131 * \f[
132 * \theta_R = \pi - 2\arctan\left(\frac{2b}{r_0}\right)
133 * \f]
134 * \f$\theta\f$ ranges from \f$\pi\f$ (initial state) to \f$\theta_R\f$
135 * (scattered particle) and \f$r_0\f$ is the minimum distance of approach
136 * in a head-on collision (see the minimumDistance() method).
137 *
138 * \param p pointer to the Particle
139 * \param n pointer to the Nucleus
140 * \return false if below the barrier
141 */
142 G4bool coulombDeviation(Particle * const p, Nucleus const * const n) const;
143
144 /// \brief Internal CoulombNone slave to generate the avatars
145 CoulombNone theCoulombNoneSlave;
146 };
147}
148
149#endif /* G4INCLCOULOMBNONRELATIVISTIC_HH_ */
Placeholder class for no Coulomb distortion.
Abstract interface for Coulomb distortion.
double G4double
Definition: G4Types.hh:64
bool G4bool
Definition: G4Types.hh:67
void distortOut(ParticleList const &pL, Nucleus const *const n) const
Modify the momenta of the outgoing particles.
G4double maxImpactParameter(ParticleSpecies const &p, const G4double kinE, Nucleus const *const n) const
Return the maximum impact parameter for Coulomb-distorted trajectories.
ParticleEntryAvatar * bringToSurface(Particle *const p, Nucleus *const n) const
Modify the momentum of the particle and position it on the surface of the nucleus.
static const G4double eSquared
Coulomb conversion factor, in MeV*fm.
static G4double getTableSpeciesMass(const ParticleSpecies &p)
std::list< IAvatar * > IAvatarList
std::list< G4INCL::Particle * > ParticleList