Object-oriented Scientific Computing Library: Version 0.910
Variables
o2scl_fm Namespace Reference

Constants in units of fm. More...


Detailed Description

In nuclear physics is frequently convenient to work in units of $\mathrm{fm}$ with $\hbar=c=k_B=1$. Several useful constants are given here.

For example, mev gives 1 $\mathrm{MeV}$ in units of $\mathrm{fm}^{-1}$ (the solution to the equation $ 1 \mathrm{MeV} = x~\mathrm{fm}^{-1}$). If you have a number in $\mathrm{MeV}$, you can multiply by mev to get a number in units of $\mathrm{fm}^{-1}$. Alternatively, mev is a number with units $\mathrm{MeV}^{-1}\cdot\mathrm{fm}^{-1}$. These can be combined, so that erg divided by sec is 1 $\mathrm{erg/sec}$ in units of $\mathrm{fm}^{-2}$.

/todo Make e.g. neutron mass consistent with the GSL ones somehow.

Variables

const double mev = 1.0/o2scl_const::hc_mev_fm
 1 $\mathrm{MeV}$ in $\mathrm{fm}^{-1}$
const double kg = mev*5.60958885e29
 1 $\mathrm{kg}$ in $\mathrm{fm}^{-1}$
const double Kelvin = 8.6173324e-11*mev
 1 $\mathrm{Kelvin}$ in $\mathrm{fm}^{-1}$
const double joule = kg/gsl_mks::speed_of_light/gsl_mks::speed_of_light
 1 $\mathrm{Joule}$ in $\mathrm{fm}^{-1}$
const double msun_per_km3 = gsl_mks::solar_mass/1.0e54*kg
 1 $M_{\odot}/km^{3}$ in $\mathrm{fm}^{-4}$
const double erg = kg/1.0e3/gsl_cgs::speed_of_light/gsl_cgs::speed_of_light
 1 $\mathrm{erg}$ in $\mathrm{fm}^{-1}$
const double sec = gsl_mks::speed_of_light*1.0e15
 1 $\mathrm{second}$ in $\mathrm{fm}$
const double ec_gauss_fm2
 1 $\mathrm{Gauss}$ times the electron charge in Gaussian units in $\mathrm{fm}^{-2}$
const double gauss2_fm4 = ec_gauss_fm2*ec_gauss_fm2/gsl_num::fine_structure
 Conversion factor from $ \mathrm{Gauss}^2 $ to $\mathrm{fm}^{-4}$ in Gaussian units.
From http://physics.nist.gov/cuu/index.html (7/27/11)
const double mass_neutron = 939.565379/o2scl_const::hc_mev_fm
 Neutron mass in $ \mathrm{fm}^{-1} $.
const double mass_proton = 938.272046/o2scl_const::hc_mev_fm
 Proton mass in $ \mathrm{fm}^{-1} $.
const double mass_electron = 0.510998928/o2scl_const::hc_mev_fm
 Electron mass in $ \mathrm{fm}^{-1} $.
const double mass_muon = 105.6583715/o2scl_const::hc_mev_fm
 Muon mass in $ \mathrm{fm}^{-1} $.
const double mass_amu = 931.494061/o2scl_const::hc_mev_fm
 Atomic mass unit in $ \mathrm{fm}^{-1} $.
const double mass_alpha = 3727.379240/o2scl_const::hc_mev_fm
 Alpha particle mass in $ \mathrm{fm}^{-1} $.
Masses from Particle Physics Booklet

(see also D.E. Groom, et. al., Euro. Phys. J. C 15 (2000) 1.)

const double mass_lambda = 1115.683/o2scl_const::hc_mev_fm
 $\Lambda$ mass in $ \mathrm{fm}^{-1} $
const double mass_sigmam = 1197.45/o2scl_const::hc_mev_fm
 $\Sigma^{-}$ mass in $ \mathrm{fm}^{-1} $
const double mass_sigma = 1192.642/o2scl_const::hc_mev_fm
 $\Sigma^{0}$ mass in $ \mathrm{fm}^{-1} $
const double mass_sigmap = 1189.37/o2scl_const::hc_mev_fm
 $\Sigma^{+}$ mass in $ \mathrm{fm}^{-1} $
const double mass_cascadem = 1321.3/o2scl_const::hc_mev_fm
 $\Xi^{-}$ mass in $ \mathrm{fm}^{-1} $
const double mass_cascade = 1314.8/o2scl_const::hc_mev_fm
 $\Xi^{0}$ mass in $ \mathrm{fm}^{-1} $
const double mass_omega = 782.57/o2scl_const::hc_mev_fm
 $\omega$ mass in $ \mathrm{fm}^{-1} $
const double mass_rho = 769.3/o2scl_const::hc_mev_fm
 $\rho$ mass in $ \mathrm{fm}^{-1} $

Variable Documentation

const double o2scl_fm::mass_alpha = 3727.379240/o2scl_const::hc_mev_fm

This does not include the mass of the additional two electrons which are present in a helium atom.

Definition at line 1040 of file constants.h.

const double o2scl_fm::ec_gauss_fm2
Initial value:

Definition at line 1091 of file constants.h.

This is useful, e.g. in converting magnetic field squared to an energy density.

Definition at line 1100 of file constants.h.

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