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${{\mathit n}}$ MASS (MeV)

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S017M

The mass is known more precisely in u (atomic mass units) than in MeV. The conversion is: 1 u = 931.494 102 42(28) MeV/c${}^{2}$ (2018 CODATA value, TIESINGA 2021).

VALUE (MeV) DOCUMENT ID TECN  COMMENT $939.56542052$ $\pm0.00000054$ TIESINGA 2021 RVUE 2018 CODATA value • • We do not use the following data for averages, fits, limits, etc. • • $939.5654133$ $\pm0.0000058$ MOHR 2016 RVUE 2014 CODATA value $939.565379$ $\pm0.000021$ MOHR 2012 RVUE 2010 CODATA value $939.565346$ $\pm0.000023$ MOHR 2008 RVUE 2006 CODATA value $939.565360$ $\pm0.000081$ MOHR 2005 RVUE 2002 CODATA value $939.565331$ $\pm0.000037$ 1 KESSLER 1999 SPEC ${{\mathit n}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit d}}{{\mathit \gamma}}$ $939.565330$ $\pm0.000038$ MOHR 1999 RVUE 1998 CODATA value $939.56565$ $\pm0.00028$ 2, 3 DIFILIPPO 1994 TRAP Penning trap $939.56563$ $\pm0.00028$ COHEN 1987 RVUE 1986 CODATA value $939.56564$ $\pm0.00028$ 4, 3 GREENE 1986 SPEC ${{\mathit n}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit d}}{{\mathit \gamma}}$ $939.5731$ $\pm0.0027$ 3 COHEN 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.

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