neutron_constants.hpp 3.5 KB

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  1. // Boost.Units - A C++ library for zero-overhead dimensional analysis and
  2. // unit/quantity manipulation and conversion
  3. //
  4. // Copyright (C) 2003-2008 Matthias Christian Schabel
  5. // Copyright (C) 2008 Steven Watanabe
  6. //
  7. // Distributed under the Boost Software License, Version 1.0. (See
  8. // accompanying file LICENSE_1_0.txt or copy at
  9. // http://www.boost.org/LICENSE_1_0.txt)
  10. #ifndef BOOST_UNITS_CODATA_NEUTRON_CONSTANTS_HPP
  11. #define BOOST_UNITS_CODATA_NEUTRON_CONSTANTS_HPP
  12. #include <boost/units/quantity.hpp>
  13. #include <boost/units/static_constant.hpp>
  14. #include <boost/units/systems/detail/constants.hpp>
  15. #include <boost/units/systems/si/amount.hpp>
  16. #include <boost/units/systems/si/area.hpp>
  17. #include <boost/units/systems/si/electric_charge.hpp>
  18. #include <boost/units/systems/si/energy.hpp>
  19. #include <boost/units/systems/si/frequency.hpp>
  20. #include <boost/units/systems/si/length.hpp>
  21. #include <boost/units/systems/si/mass.hpp>
  22. #include <boost/units/systems/si/magnetic_flux_density.hpp>
  23. #include <boost/units/systems/si/time.hpp>
  24. #include <boost/units/systems/si/wavenumber.hpp>
  25. #include <boost/units/systems/si/codata/typedefs.hpp>
  26. /// \file
  27. /// CODATA recommended values of fundamental atomic and nuclear constants
  28. /// CODATA 2006 values as of 2007/03/30
  29. namespace boost {
  30. namespace units {
  31. namespace si {
  32. namespace constants {
  33. namespace codata {
  34. /// CODATA recommended values of the fundamental physical constants: NIST SP 961
  35. /// neutron mass
  36. BOOST_UNITS_PHYSICAL_CONSTANT(m_n,quantity<mass>,1.674927211e-27*kilograms,8.4e-35*kilograms);
  37. /// neutron-electron mass ratio
  38. BOOST_UNITS_PHYSICAL_CONSTANT(m_n_over_m_e,quantity<dimensionless>,1838.6836605*dimensionless(),1.1e-6*dimensionless());
  39. /// neutron-muon mass ratio
  40. BOOST_UNITS_PHYSICAL_CONSTANT(m_n_over_m_mu,quantity<dimensionless>,8.89248409*dimensionless(),2.3e-7*dimensionless());
  41. /// neutron-tau mass ratio
  42. BOOST_UNITS_PHYSICAL_CONSTANT(m_n_over_m_tau,quantity<dimensionless>,0.528740*dimensionless(),8.6e-5*dimensionless());
  43. /// neutron-proton mass ratio
  44. BOOST_UNITS_PHYSICAL_CONSTANT(m_n_over_m_p,quantity<dimensionless>,1.00137841918*dimensionless(),4.6e-10*dimensionless());
  45. /// neutron molar mass
  46. BOOST_UNITS_PHYSICAL_CONSTANT(M_n,quantity<mass_over_amount>,1.00866491597e-3*kilograms/mole,4.3e-13*kilograms/mole);
  47. /// neutron Compton wavelength
  48. BOOST_UNITS_PHYSICAL_CONSTANT(lambda_C_n,quantity<length>,1.3195908951e-15*meters,2.0e-24*meters);
  49. /// neutron magnetic moment
  50. BOOST_UNITS_PHYSICAL_CONSTANT(mu_n,quantity<energy_over_magnetic_flux_density>,-0.96623641e-26*joules/tesla,2.3e-33*joules/tesla);
  51. /// neutron g-factor
  52. BOOST_UNITS_PHYSICAL_CONSTANT(g_n,quantity<dimensionless>,-3.82608545*dimensionless(),9.0e-7*dimensionless());
  53. /// neutron-electron magnetic moment ratio
  54. BOOST_UNITS_PHYSICAL_CONSTANT(mu_n_over_mu_e,quantity<dimensionless>,1.04066882e-3*dimensionless(),2.5e-10*dimensionless());
  55. /// neutron-proton magnetic moment ratio
  56. BOOST_UNITS_PHYSICAL_CONSTANT(mu_n_over_mu_p,quantity<dimensionless>,-0.68497934*dimensionless(),1.6e-7*dimensionless());
  57. /// neutron-shielded proton magnetic moment ratio
  58. BOOST_UNITS_PHYSICAL_CONSTANT(mu_n_over_mu_p_prime,quantity<dimensionless>,-0.68499694*dimensionless(),1.6e-7*dimensionless());
  59. /// neutron gyromagnetic ratio
  60. BOOST_UNITS_PHYSICAL_CONSTANT(gamma_n,quantity<frequency_over_magnetic_flux_density>,1.83247185e8/second/tesla,4.3e1/second/tesla);
  61. } // namespace codata
  62. } // namespace constants
  63. } // namespace si
  64. } // namespace units
  65. } // namespace boost
  66. #endif // BOOST_UNITS_CODATA_NEUTRON_CONSTANTS_HPP