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source
particles
hadrons
mesons
src
G4PionZero.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
//
29
// ----------------------------------------------------------------------
30
// GEANT 4 class implementation file
31
//
32
// History: first implementation, based on object model of
33
// 4th April 1996, G.Cosmo
34
// **********************************************************************
35
// New impelemenataion as an utility class M.Asai, 26 July 2004
36
// ----------------------------------------------------------------------
37
38
#include "
G4PionZero.hh
"
39
#include "
G4PhysicalConstants.hh
"
40
#include "
G4SystemOfUnits.hh
"
41
#include "
G4ParticleTable.hh
"
42
43
44
#include "
G4PhaseSpaceDecayChannel.hh
"
45
#include "
G4DalitzDecayChannel.hh
"
46
#include "
G4DecayTable.hh
"
47
48
// ######################################################################
49
// ### PIONZERO ###
50
// ######################################################################
51
52
G4PionZero
*
G4PionZero::theInstance
= 0;
53
54
G4PionZero
*
G4PionZero::Definition
()
55
{
56
if
(
theInstance
!=0)
return
theInstance
;
57
const
G4String
name
=
"pi0"
;
58
// search in particle table]
59
G4ParticleTable
* pTable =
G4ParticleTable::GetParticleTable
();
60
G4ParticleDefinition
* anInstance = pTable->
FindParticle
(
name
);
61
if
(anInstance ==0)
62
{
63
// create particle
64
//
65
// Arguments for constructor are as follows
66
// name mass width charge
67
// 2*spin parity C-conjugation
68
// 2*Isospin 2*Isospin3 G-parity
69
// type lepton number baryon number PDG encoding
70
// stable lifetime decay table
71
// shortlived subType anti_encoding
72
73
anInstance =
new
G4ParticleDefinition
(
74
name
, 0.1349766*
GeV
, 7.73e-06*
MeV
, 0.0,
75
0, -1, +1,
76
2, 0, -1,
77
"meson"
, 0, 0, 111,
78
false
, 8.52e-8*
ns
, NULL,
79
false
,
"pi"
, 111);
80
81
// Life time is given from width
82
anInstance->
SetPDGLifeTime
(
hbar_Planck
/(anInstance->
GetPDGWidth
()) );
83
84
//create Decay Table
85
G4DecayTable
* table =
new
G4DecayTable
();
86
87
// create a decay channel
88
G4VDecayChannel
* mode;
89
// pi0 -> gamma + gamma
90
mode =
new
G4PhaseSpaceDecayChannel
(
"pi0"
,0.988,2,
"gamma"
,
"gamma"
);
91
table->
Insert
(mode);
92
// pi0 -> gamma + e+ + e-
93
mode =
new
G4DalitzDecayChannel
(
"pi0"
,0.012,
"e-"
,
"e+"
);
94
table->
Insert
(mode);
95
96
anInstance->
SetDecayTable
(table);
97
}
98
theInstance
=
reinterpret_cast<
G4PionZero
*
>
(anInstance);
99
return
theInstance
;
100
}
101
102
G4PionZero
*
G4PionZero::PionZeroDefinition
()
103
{
104
return
Definition
();
105
}
106
107
G4PionZero
*
G4PionZero::PionZero
()
108
{
109
return
Definition
();
110
}
111
G4DalitzDecayChannel.hh
G4DecayTable.hh
G4ParticleTable.hh
G4PhaseSpaceDecayChannel.hh
G4PhysicalConstants.hh
G4PionZero.hh
GeV
static constexpr double GeV
Definition:
G4SIunits.hh:203
MeV
static constexpr double MeV
Definition:
G4SIunits.hh:200
G4SystemOfUnits.hh
G4DalitzDecayChannel
Definition:
G4DalitzDecayChannel.hh:43
G4DecayTable
Definition:
G4DecayTable.hh:46
G4DecayTable::Insert
void Insert(G4VDecayChannel *aChannel)
Definition:
G4DecayTable.cc:53
G4ParticleDefinition
Definition:
G4ParticleDefinition.hh:61
G4ParticleDefinition::G4ParticleDefinition
G4ParticleDefinition()
Definition:
G4ParticleDefinition.cc:175
G4ParticleDefinition::GetPDGWidth
G4double GetPDGWidth() const
Definition:
G4ParticleDefinition.hh:112
G4ParticleDefinition::SetPDGLifeTime
void SetPDGLifeTime(G4double aLifeTime)
Definition:
G4ParticleDefinition.hh:151
G4ParticleDefinition::SetDecayTable
void SetDecayTable(G4DecayTable *aDecayTable)
G4ParticleTable
Definition:
G4ParticleTable.hh:60
G4ParticleTable::FindParticle
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
Definition:
G4ParticleTable.cc:586
G4ParticleTable::GetParticleTable
static G4ParticleTable * GetParticleTable()
Definition:
G4ParticleTable.cc:87
G4PhaseSpaceDecayChannel
Definition:
G4PhaseSpaceDecayChannel.hh:43
G4PionZero
Definition:
G4PionZero.hh:50
G4PionZero::PionZeroDefinition
static G4PionZero * PionZeroDefinition()
Definition:
G4PionZero.cc:102
G4PionZero::Definition
static G4PionZero * Definition()
Definition:
G4PionZero.cc:54
G4PionZero::theInstance
static G4PionZero * theInstance
Definition:
G4PionZero.hh:52
G4PionZero::PionZero
static G4PionZero * PionZero()
Definition:
G4PionZero.cc:107
G4String
Definition:
G4String.hh:62
G4VDecayChannel
Definition:
G4VDecayChannel.hh:50
G4InuclParticleNames::name
const char * name(G4int ptype)
Definition:
G4InuclParticleNames.hh:76
source.hepunit.hbar_Planck
float hbar_Planck
Definition:
hepunit.py:263
ns
#define ns
Definition:
xmlparse.cc:614
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