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Header <boost/units/systems/si/codata/alpha_constants.hpp>

CODATA recommended values of fundamental atomic and nuclear constants CODATA 2006 values as of 2007/03/30

namespace boost {
  namespace units {
    namespace si {
      namespace constants {
        namespace codata {
           BOOST_UNITS_PHYSICAL_CONSTANT(m_alpha, quantity< mass >, 
                                         6.64465620e-27 *, 3.3e-34 *);

          // alpha-electron mass ratio 
           BOOST_UNITS_PHYSICAL_CONSTANT(m_alpha_over_m_e, 
                                         quantity< dimensionless >, 
                                         7294.2995365 * dimensionless, 
                                         3.1e-6 * dimensionless);

          // alpha-proton mass ratio 
           BOOST_UNITS_PHYSICAL_CONSTANT(m_alpha_over_m_p, 
                                         quantity< dimensionless >, 
                                         3.97259968951 * dimensionless, 
                                         4.1e-10 * dimensionless);

          // alpha molar mass 
           BOOST_UNITS_PHYSICAL_CONSTANT(M_alpha, 
                                         quantity< mass_over_amount >, 
                                         4.001506179127e-3 *kilograms/ mole, 
                                         6.2e-14 *kilograms/ mole);
        }
      }
    }
  }
}

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