Gabriele Cosmo
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: PhysicalConstants.h,v 1.4 1999/11/19 09:19:31 gcosmo Exp $
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// GEANT4 tag $Name: geant4-01-01 $
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//
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// ----------------------------------------------------------------------
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//
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// Class description:
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//
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// HEP coherent Physical Constants
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//
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// This file has been provided to CLHEP by Geant4 (simulation toolkit for HEP).
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//
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// The basic units are :
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// millimeter
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// nanosecond
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// Mega electron Volt
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// positon charge
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// degree Kelvin
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// amount of substance (mole)
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// luminous intensity (candela)
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// radian
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// steradian
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//
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// Below is a non exhaustive List of Physical CONSTANTS,
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// computed in the Internal HEP System Of Units.
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//
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// Most of them are extracted from the Particle Data Book :
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// Phys. Rev. D volume 50 3-1 (1994) page 1233
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//
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// ...with a meaningful (?) name ...
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//
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// You can add your own constants.
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//
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// Author: M.Maire
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//
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// History:
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//
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// 23.02.96 Created
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// 26.03.96 Added constants for standard conditions of temperature
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// and pressure; also added Gas threshold.
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#ifndef HEP_PHYSICAL_CONSTANTS_H
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#define HEP_PHYSICAL_CONSTANTS_H
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#include "SystemOfUnits.h"
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///#include "G4UnitsTest.hh"
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//
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//
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//
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static const HepDouble pi = 3.14159265358979323846;
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static const HepDouble twopi = 2*pi;
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static const HepDouble halfpi = pi/2;
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static const HepDouble pi2 = pi*pi;
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//
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//
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//
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static const HepDouble Avogadro = 6.0221367e+23/mole;
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//
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// c = 299.792458 mm/ns
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// c^2 = 898.7404 (mm/ns)^2
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//
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static const HepDouble c_light = 2.99792458e+8 * m/s;
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static const HepDouble c_squared = c_light * c_light;
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//
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// h = 4.13566e-12 MeV*ns
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// hbar = 6.58212e-13 MeV*ns
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// hbarc = 197.32705e-12 MeV*mm
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//
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static const HepDouble h_Planck = 6.6260755e-34 * joule*s;
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static const HepDouble hbar_Planck = h_Planck/twopi;
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static const HepDouble hbarc = hbar_Planck * c_light;
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static const HepDouble hbarc_squared = hbarc * hbarc;
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//
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//
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//
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static const HepDouble electron_charge = - eplus; // see SystemOfUnits.h
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static const HepDouble e_squared = eplus * eplus;
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//
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// amu_c2 - atomic equivalent mass unit
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// amu - atomic mass unit
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//
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static const HepDouble electron_mass_c2 = 0.51099906 * MeV;
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static const HepDouble proton_mass_c2 = 938.27231 * MeV;
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static const HepDouble neutron_mass_c2 = 939.56563 * MeV;
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static const HepDouble amu_c2 = 931.49432 * MeV;
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static const HepDouble amu = amu_c2/c_squared;
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//
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// permeability of free space mu0 = 2.01334e-16 Mev*(ns*eplus)^2/mm
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// permittivity of free space epsil0 = 5.52636e+10 eplus^2/(MeV*mm)
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//
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static const HepDouble mu0 = 4*pi*1.e-7 * henry/m;
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static const HepDouble epsilon0 = 1./(c_squared*mu0);
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//
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// electromagnetic coupling = 1.43996e-12 MeV*mm/(eplus^2)
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//
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static const HepDouble elm_coupling = e_squared/(4*pi*epsilon0);
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static const HepDouble fine_structure_const = elm_coupling/hbarc;
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static const HepDouble classic_electr_radius = elm_coupling/electron_mass_c2;
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static const HepDouble electron_Compton_length = hbarc/electron_mass_c2;
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static const HepDouble Bohr_radius = electron_Compton_length/fine_structure_const;
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static const HepDouble alpha_rcl2 = fine_structure_const
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*classic_electr_radius
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*classic_electr_radius;
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static const HepDouble twopi_mc2_rcl2 = twopi*electron_mass_c2
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*classic_electr_radius
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*classic_electr_radius;
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//
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//
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//
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static const HepDouble k_Boltzmann = 8.617385e-11 * MeV/kelvin;
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//
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//
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//
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static const HepDouble STP_Temperature = 273.15*kelvin;
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static const HepDouble STP_Pressure = 1.*atmosphere;
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static const HepDouble kGasThreshold = 10.*mg/cm3;
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//
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//
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//
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static const HepDouble universe_mean_density = 1.e-25*g/cm3;
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#endif /* HEP_PHYSICAL_CONSTANTS_H */
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