# ${{\boldsymbol p}}$ MASS (atomic mass units u) INSPIRE search

The mass is known much more precisely in u (atomic mass units) than in MeV. See the next data block.
VALUE (u) DOCUMENT ID TECN  COMMENT
$\bf{ 1.00727646662 \pm0.00000000009}$ OUR AVERAGE  Error includes scale factor of 3.1.
$1.007276466583$ $\pm0.000000000032$ 1
 2017
SPEC Penning trap
$1.007276466879$ $\pm0.000000000091$
 2016
RVUE 2014 CODATA value
• • • We do not use the following data for averages, fits, limits, etc. • • •
$1.007276466812$ $\pm0.000000000090$
 2012
RVUE 2010 CODATA value
$1.00727646677$ $\pm0.00000000010$
 2008
RVUE 2006 CODATA value
$1.00727646688$ $\pm0.00000000013$
 2005
RVUE 2002 CODATA value
$1.00727646688$ $\pm0.00000000013$
 1999
RVUE 1998 CODATA value
$1.007276470$ $\pm0.000000012$
 1987
RVUE 1986 CODATA value
1  The statistical and systematic errors are 15 and 29 in the last two places of the value. The value disagrees with the MOHR 2016 value by over 3 standard deviations.
References:
 HEISSE 2017
PRL 119 033001 High-Precision Measurement of the Proton's Atomic Mass
 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
 MOHR 1999
JPCRD 28 1713 CODATA Recommended Values of the Fundamental Physical Constants: 1998;
 COHEN 1987
RMP 59 1121 CODATA Fundamental Physical Constants 1986 Adjustments