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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: PhysicalConstants.h,v 2.1 1998/07/12 02:58:59 urbi Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+// -*- C++ -*-
+// 
+// ----------------------------------------------------------------------
+// HEP coherent Physical Constants
+//
+// This file has been provided by Geant4 (simulation toolkit for HEP).
+//
+// The basic units are :
+//  		millimeter  
+// 		nanosecond  
+// 		Mega electron Volt  
+// 		positon charge 
+// 		degree Kelvin
+//              amount of substance (mole)
+//              luminous intensity (candela)
+// 		radian  
+//              steradian 
+//
+// Below is a non exhaustive List of Physical CONSTANTS,
+// computed in the Internal HEP System Of Units.
+//
+// Most of them are extracted from the Particle Data Book :
+//        Phys. Rev. D  volume 50 3-1 (1994) page 1233
+// 
+//        ...with a meaningful (?) name ...
+//
+// You can add your own constants.
+//
+// Author: M.Maire
+//
+// History:
+//
+// 23.02.96 Created
+// 26.03.96 Added constants for standard conditions of temperature
+//          and pressure; also added Gas threshold.
+
+#ifndef HEP_PHYSICAL_CONSTANTS_H
+#define HEP_PHYSICAL_CONSTANTS_H
+
+#include "SystemOfUnits.h"
+
+//
+//
+//
+static const HepDouble     pi  = 3.14159265358979323846;
+static const HepDouble  twopi  = 2*pi;
+static const HepDouble halfpi  = pi/2;
+static const HepDouble     pi2 = pi*pi;
+
+//
+// 
+//
+static const HepDouble Avogadro = 6.0221367e+23/mole;
+
+//
+// c   = 299.792458 mm/ns
+// c^2 = 898.7404 (mm/ns)^2 
+//
+static const HepDouble c_light   = 2.99792458e+8 * m/s;
+static const HepDouble c_squared = c_light * c_light;
+
+//
+// h     = 4.13566e-12 MeV*ns
+// hbar  = 6.58212e-13 MeV*ns
+// hbarc = 197.32705e-12 MeV*mm
+//
+static const HepDouble h_Planck      = 6.6260755e-34 * joule*s;
+static const HepDouble hbar_Planck   = h_Planck/twopi;
+static const HepDouble hbarc         = hbar_Planck * c_light;
+static const HepDouble hbarc_squared = hbarc * hbarc;
+
+//
+//
+//
+static const HepDouble electron_charge = - eplus; // see SystemOfUnits.h
+static const HepDouble e_squared = eplus * eplus;
+
+//
+// amu_c2 - atomic equivalent mass unit
+// amu    - atomic mass unit
+//
+static const HepDouble electron_mass_c2 = 0.51099906 * MeV;
+static const HepDouble   proton_mass_c2 = 938.27231 * MeV;
+static const HepDouble  neutron_mass_c2 = 939.56563 * MeV;
+static const HepDouble           amu_c2 = 931.49432 * MeV;
+static const HepDouble              amu = amu_c2/c_squared;
+
+//
+// permeability of free space mu0    = 2.01334e-16 Mev*(ns*eplus)^2/mm
+// permittivity of free space epsil0 = 5.52636e+10 eplus^2/(MeV*mm)
+//
+static const HepDouble mu0      = 4*pi*1.e-7 * henry/m;
+static const HepDouble epsilon0 = 1./(c_squared*mu0);
+
+//
+// electromagnetic coupling = 1.43996e-12 MeV*mm/(eplus^2)
+//
+static const HepDouble elm_coupling           = e_squared/(4*pi*epsilon0);
+static const HepDouble fine_structure_const   = elm_coupling/hbarc;
+static const HepDouble classic_electr_radius  = elm_coupling/electron_mass_c2;
+static const HepDouble electron_Compton_length = hbarc/electron_mass_c2;
+static const HepDouble Bohr_radius = electron_Compton_length/fine_structure_const;
+
+static const HepDouble alpha_rcl2 = fine_structure_const
+                                   *classic_electr_radius
+                                   *classic_electr_radius;
+
+static const HepDouble twopi_mc2_rcl2 = twopi*electron_mass_c2
+                                             *classic_electr_radius
+                                             *classic_electr_radius;
+//
+//
+//
+static const HepDouble k_Boltzmann = 8.617385e-11 * MeV/kelvin;
+
+//
+//
+//
+static const HepDouble STP_Temperature = 273.15*kelvin;
+static const HepDouble STP_Pressure    = 1.*atmosphere;
+static const HepDouble kGasThreshold   = 10.*mg/cm3;
+
+//
+//
+//
+static const HepDouble universe_mean_density = 1.e-25*g/cm3;
+
+#endif /* HEP_PHYSICAL_CONSTANTS_H */
+
+
+
+
+