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${{\mathit p}}$ MASS (atomic mass units u)

INSPIRE   PDGID:

S016AMU

The mass is known more precisely in u (atomic mass units) than in MeV. See the next data block.

VALUE (u) DOCUMENT ID TECN  COMMENT $\bf{ 1.007276466621 \pm0.000000000053}$ OUR EVALUATION  2018 CODATA $1.007276466574$ $\pm0.000000000010$ 1 FINK 2021 SPEC Penning trap $1.007276466621$ $\pm0.000000000053$ 2 TIESINGA 2021 RVUE 2018 CODATA value • • We do not use the following data for averages, fits, limits, etc. • • $1.007276466598$ $\pm0.000000000033$ 3 HEISSE 2019 SPEC Penning Trap $1.007276466583$ $\pm0.000000000032$ 4 HEISSE 2017 SPEC See HEISSE 2019 $1.007276466879$ $\pm0.000000000091$ MOHR 2016 RVUE 2014 CODATA value $1.007276466812$ $\pm0.000000000090$ MOHR 2012 RVUE 2010 CODATA value $1.00727646677$ $\pm0.00000000010$ MOHR 2008 RVUE 2006 CODATA value $1.00727646688$ $\pm0.00000000013$ MOHR 2005 RVUE 2002 CODATA value $1.00727646688$ $\pm0.00000000013$ MOHR 1999 RVUE 1998 CODATA value $1.007276470$ $\pm0.000000012$ COHEN 1987 RVUE 1986 CODATA value 1  FINK 2021 simultaneously measure the cyclotron frequencies of an ${{\mathit H}_{{2}}^{+}}$ ion and a deuteron in a coupled magnetron orbit. The proton mass is extracted using the precise deuteron mass value. 2  The 2018 CODATA combination in TIESINGA 2021 includes data from HEISSE 2017 , but does not include updates in HEISSE 2019 , which superseded HEISSE 2017 . Consequently, we do not average HEISSE 2019 and TIESINGA 2021 . Updating the 2018 CODATA combination to use HEISSE 2019 would shift the central value for the proton mass upwards by less than half a standard deviation. Therefore, we take the 2018 CODATA result in TIESINGA 2021 as the recommended value for the proton mass. 3  The value is an update of HEISSE 2017 ; the result is shifted by $1.5 \times 10^{-11}$ u, corresponding to 0.45 ${{\mathit \sigma}}$ due to the corrected motional temperatures of the particles. The statistical and total systematic uncertainties are given as 16 and 29 in the last two digits. 4  The statistical and systematic errors are 15 and 29 in the last two places of the value. Superseded by HEISSE 2019 .

References:

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 HEISSE 2019 PR A100 022518 High-precision mass spectrometer for light ions 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; Also RMP 72 351 CODATA Recommended Values of the Fundamental Physical Constants: 1998 COHEN 1987 RMP 59 1121 CODATA Fundamental Physical Constants 1986 Adjustments