| Geant4 Cross Reference |
1 // -*- C++ -*- 1
2 // -------------------------------------------
3 // HEP coherent Physical Constants
4 //
5 // This file has been provided by Geant4 (simu
6 //
7 // The basic units are :
8 // millimeter
9 // nanosecond
10 // Mega electron Volt
11 // positon charge
12 // degree Kelvin
13 // amount of substance (mole)
14 // luminous intensity (candela)
15 // radian
16 // steradian
17 //
18 // Below is a non exhaustive list of Physical
19 // computed in the Internal HEP System Of Unit
20 //
21 // Most of them are extracted from the Particl
22 // Phys. Rev. D volume 50 3-1 (1994) p
23 //
24 // ...with a meaningful (?) name ...
25 //
26 // You can add your own constants.
27 //
28 // Author: M.Maire
29 //
30 // History:
31 //
32 // 23.02.96 Created
33 // 26.03.96 Added constants for standard condi
34 // and pressure; also added Gas thres
35 // 29.04.08 Use PDG 2006 values
36 // 03.11.08 Use PDG 2008 values
37 // 17.07.20 Use PDG 2019 values
38 // 06.05.21 Added Bohr_magneton and nuclear_ma
39
40 #ifndef HEP_PHYSICAL_CONSTANTS_H
41 #define HEP_PHYSICAL_CONSTANTS_H
42
43 #include "CLHEP/Units/SystemOfUnits.h"
44
45 namespace CLHEP {
46
47 //
48 //
49 //
50 static constexpr double Avogadro = 6.02214076e
51
52 //
53 // c = 299.792458 mm/ns
54 // c^2 = 898.7404 (mm/ns)^2
55 //
56 static constexpr double c_light = 2.99792458
57 static constexpr double c_squared = c_light *
58
59 //
60 // h = 4.13566e-12 MeV*ns
61 // hbar = 6.58212e-13 MeV*ns
62 // hbarc = 197.32705e-12 MeV*mm
63 //
64 static constexpr double h_Planck = 6.6260
65 static constexpr double hbar_Planck = h_Plan
66 static constexpr double hbarc = hbar_P
67 static constexpr double hbarc_squared = hbarc
68
69 //
70 //
71 //
72 static constexpr double electron_charge = - ep
73 static constexpr double e_squared = eplus * ep
74
75 //
76 // amu_c2 - atomic equivalent mass unit
77 // - AKA, unified atomic mass unit (u)
78 // amu - atomic mass unit
79 //
80 static constexpr double electron_mass_c2 = 0.5
81 static constexpr double proton_mass_c2 = 938
82 static constexpr double neutron_mass_c2 = 939
83 static constexpr double amu_c2 = 931
84 static constexpr double amu = amu
85
86 //
87 // permeability of free space mu0 = 2.01334
88 // permittivity of free space epsil0 = 5.52636
89 //
90 static constexpr double mu0 = 4*pi*1.e-7
91 static constexpr double epsilon0 = 1./(c_squar
92
93 //
94 // electromagnetic coupling = 1.43996e-12 MeV*
95 //
96 static constexpr double elm_coupling
97 static constexpr double fine_structure_const
98 static constexpr double classic_electr_radius
99 static constexpr double electron_Compton_lengt
100 static constexpr double Bohr_radius = electron
101
102 static constexpr double alpha_rcl2 = fine_stru
103 *classic_el
104 *classic_el
105
106 static constexpr double twopi_mc2_rcl2 = twopi
107 *
108 *
109
110 static constexpr double Bohr_magneton = (eplus
111 static constexpr double nuclear_magneton = (ep
112
113 //
114 //
115 //
116 static constexpr double k_Boltzmann = 8.617333
117
118 //
119 //
120 //
121 static constexpr double STP_Temperature = 273.
122 static constexpr double STP_Pressure = 1.*a
123 static constexpr double kGasThreshold = 10.*
124
125 //
126 //
127 //
128 static constexpr double universe_mean_density
129
130 } // namespace CLHEP
131
132 #endif /* HEP_PHYSICAL_CONSTANTS_H */
133
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