The mass is known more precisely in u (atomic mass units) than in MeV. The conversion is: 1 u = 931.494 103 72(29) MeV/c${}^{2}$ (2022 CODATA value, MOHR 2025).
S016M
VALUE
(MeV)
DOCUMENT ID
TECN
COMMENT
$\bf{
938.27208943 \pm0.00000029}$
OUR EVALUATION2022 CODATA
$938.27208943$ $\pm0.00000029$
MOHR
2025
RVUE
2022 CODATA value
• • • We do not use the following data for averages, fits, limits, etc. • • •
$938.27208812$ $\pm0.00000029$
FINK
2021
SPEC
Penning trap
$938.27208816$ $\pm0.00000029$
TIESINGA
2021
RVUE
2018 CODATA value
$938.2720813$ $\pm0.0000058$
MOHR
2016
RVUE
2014 CODATA value
$938.272046$ $\pm0.000021$
MOHR
2012
RVUE
2010 CODATA value
$938.272013$ $\pm0.000023$
MOHR
2008
RVUE
2006 CODATA value
$938.272029$ $\pm0.000080$
MOHR
2005
RVUE
2002 CODATA value
$938.271998$ $\pm0.000038$
MOHR
1999
RVUE
1998 CODATA value
$938.27231$ $\pm0.00028$
COHEN
1987
RVUE
1986 CODATA value
$938.2796$ $\pm0.0027$
COHEN
1973
RVUE
1973 CODATA value
References:
MOHR
2025
RMP 97 025002
CODATA Recommended Values of the Fundamental Physical Constants: 2022
FINK
2021
PRL 127 243001
Deuteron-To-Proton Mass Ratio from Simultaneous Measurement of the Cyclotron Frequencies of H2+ and D+
TIESINGA
2021
RMP 93 025010
CODATA recommended values of the fundamental physical constants: 2018
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;
Also
RMP 72 351
CODATA Recommended Values of the Fundamental Physical Constants: 1998
COHEN
1987
RMP 59 1121
CODATA Fundamental Physical Constants 1986 Adjustments
COHEN
1973
JPCRD 2 664
Comment{CODATA}: The 1973 Least Squares Adjustment of the Fundamental Constants
