# ${{\boldsymbol n}}$ MASS (MeV) INSPIRE search

The mass is known much more precisely in u (atomic mass units) than in MeV. The conversion from u to MeV, 1 u = 931.494$~$0054(57)) MeV/$\mathit c{}^{2}$ (MOHR 2016 , the 2014 CODATA value), involves the relatively poorly known electronic charge.
VALUE (MeV) DOCUMENT ID TECN  COMMENT
$939.5654133$ $\pm0.0000058$
 2016
RVUE 2014 CODATA value
• • • We do not use the following data for averages, fits, limits, etc. • • •
$939.565379$ $\pm0.000021$
 2012
RVUE 2010 CODATA value
$939.565346$ $\pm0.000023$
 2008
RVUE 2006 CODATA value
$939.565360$ $\pm0.000081$
 2005
RVUE 2002 CODATA value
$939.565331$ $\pm0.000037$ 1
 1999
SPEC ${{\mathit n}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit d}}{{\mathit \gamma}}$
$939.565330$ $\pm0.000038$
 1999
RVUE 1998 CODATA value
$939.56565$ $\pm0.00028$ 2, 3
 1994
TRAP Penning trap
$939.56563$ $\pm0.00028$
 1987
RVUE 1986 CODATA value
$939.56564$ $\pm0.00028$ 4, 3
 1986
SPEC ${{\mathit n}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit d}}{{\mathit \gamma}}$
$939.5731$ $\pm0.0027$ 3
 1973
RVUE 1973 CODATA value
1  We use the 1998 CODATA u-to-MeV conversion factor (see the heading above) to get this mass in MeV from the much more precisely measured KESSLER 1999 value of $1.00866491637$ $\pm0.00000000082~$u.
2  The mass is known much more precisely in u: $\mathit m$ = $1.0086649235$ $\pm0.0000000023$ u. We use the 1986 CODATA conversion factor to get the mass in MeV.
3  These determinations are not independent of the ${\mathit m}_{{{\mathit n}}}–{\mathit m}_{{{\mathit p}}}$ measurements below.
4  The mass is known much more precisely in u: $\mathit m$ = $1.008664919$ $\pm0.000000014$ u.
References:
 MOHR 2016
RMP 88 035009 CODATA Recommended Values of the Fundamental Physical Constants: 2014
 MOHR 2012
RMP 84 1527 CODATA Recommended Values of the Fundamental Physical Constants: 2010
 MOHR 2008
RMP 80 633 CODATA Recomended Values of the Fundamental Physical Constants: 2006
 MOHR 2005
RMP 77 1 NIST Constants
 KESSLER 1999
PL A255 221 The Deuteron Binding Energy and the Neutron Mass
 MOHR 1999
JPCRD 28 1713 CODATA Recommended Values of the Fundamental Physical Constants: 1998;
 DIFILIPPO 1994
PRL 73 1481 Accurate atomic Masses for Fundamental Metrology
 COHEN 1987
RMP 59 1121 CODATA Fundamental Physical Constants 1986 Adjustments
 GREENE 1986
PRL 56 819 New Determination of the Deuteron Binding Energy and the Neutron Mass
 COHEN 1973
JPCRD 2 664 Comment{CODATA}: The 1973 Least Squares Adjustment of the Fundamental Constants