From: physics. nist. gov/constants Fundamental Physical Constants-Complete listing Relative std Ouar Symbol Value Unit t uncert. Il neutron mass 167492716(13)×10-27 79×10=8 in u, mn= Ar(n)u(neutron relative atomic mass times u) 1.00866491578(55) 54×10-10 energy equivalent 50534946(12)×10-10J n mev 939565330(38) Mev 40×10-8 neutron-electron mass ratio 1838.6836550(40) 2.2×10 neutron-muon mass ratio 889248478(27) 3.0×10 neutron-tau mass ratio mn/m 0.528722(86) 16×10-4 neutron-proton mass ratio 1.00137841887(5 58×10-10 neutron molar mass Namn M(n),Mn1.00866491578(55)×10-3 kg mol-5.4×10 neutron Compton wavelength h/ mnc \C,n 1319590898(10)×10-15m 7.6×10-9 No 02100194142(16)×10-15m 7.6×10-9 neutron magnetic moment n -0.96623640(23)×10-26JT-124×10-7 to bohr magneton ratio /u 1.04187563(25)×10-3 2.4×10 to nuclear magneton ratio An/AN 1.91304272(45) 2.4×10 neutron g-factor 2un/uN 3.82608545(90) 24×10-7 neutron -electron moment ratio An/pe 1.04066882(25)×10-3 2.4×10-7 neutron-proton magnetic moment ratio 0.68497934(16) 2.4×10 neutron to shielded proton magnetic moment ratio pn/pp-0.68499694(16) 2.4×10 (H2O, sphere,25°C) neutron gyromagnetic ratio 2lunI/h 183247188(44)×108 2.4×10 29.1646958(70) MHzT-124×10- d deuteron mass 3.34358309(26)×10-27 79×10=8 in u, md= Ar(d)u(deuteron relative atomic mass times u) 2.01355321271(35) energy equivalent 3.00506262(24)×10-10J 7.9×10 n mev 1875.612762(75) Mev 4.0×10-8 deuteron-electron mass ratio md/m3670.4829550(78) 2.1×10-9 deuteron-proton mass rat m/mp1.99900750083(41) 2.0×10-10 deuteron molar mass Namd M(d),Ma2.01355321271(35)×10-3 kg mol-11.7×10-10 deuteron magnetic moment 18)×10-26JT-1 4.2×10 to bohr magneton ratio d/B0.4669754556(50)×10-3 to nuclear magneton ratio 1d/N0.574382284(94) 1.1×10 deuteron-electron magnetic moment ratio ud/ue 4664345537(50)×10-4 1.1×10-8 deuteron-proton magnetic moment ratIo 0.3070122083(45) 1.5×10 Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, 1999 and Reviews of Modern Physics, Vol. 72, No. 2, 2000From: physics.nist.gov/constants Fundamental Physical Constants — Complete Listing Relative std. Quantity Symbol Value Unit uncert. ur neutron mass mn 1.674 927 16(13) × 10−27 kg 7.9 × 10−8 in u, mn = Ar(n) u (neutron relative atomic mass times u) 1.008 664915 78(55) u 5.4 × 10−10 energy equivalent mnc2 1.505 349 46(12)× 10−10 J 7.9 × 10−8 in MeV 939.565 330(38) MeV 4.0 × 10−8 neutron-electron mass ratio mn/me 1 838.683 6550(40) 2.2 × 10−9 neutron-muon mass ratio mn/mµ 8.892 484 78(27) 3.0 × 10−8 neutron-tau mass ratio mn/mτ 0.528 722(86) 1.6 × 10−4 neutron-proton mass ratio mn/mp 1.001 378 418 87(58) 5.8 × 10−10 neutron molar mass NAmn M(n), Mn 1.008 664915 78(55) × 10−3 kg mol−1 5.4 × 10−10 neutron Compton wavelength h/mnc λC,n 1.319 590 898(10) × 10−15 m 7.6 × 10−9 λC,n/2π žC,n 0.210 019 4142(16) × 10−15 m 7.6 × 10−9 neutron magnetic moment µn −0.966 236 40(23)× 10−26 J T−1 2.4 × 10−7 to Bohr magneton ratio µn/µB −1.041 875 63(25)× 10−3 2.4 × 10−7 to nuclear magneton ratio µn/µN −1.913 04272(45) 2.4 × 10−7 neutron g-factor 2µn/µN gn −3.826 085 45(90) 2.4 × 10−7 neutron-electron magnetic moment ratio µn/µe 1.040 668 82(25) × 10−3 2.4 × 10−7 neutron-proton magnetic moment ratio µn/µp −0.684 979 34(16) 2.4 × 10−7 neutron to shielded proton magnetic moment ratio µn/µ0 p −0.684 996 94(16) 2.4 × 10−7 (H2O, sphere, 25 ◦C) neutron gyromagnetic ratio 2|µn|/ γn 1.832 471 88(44) × 108 s−1 T−1 2.4 × 10−7 γn/2π 29.164 6958(70) MHz T−1 2.4 × 10−7 Deuteron, d deuteron mass md 3.343 583 09(26)× 10−27 kg 7.9 × 10−8 in u, md = Ar(d) u (deuteron relative atomic mass times u) 2.013 553 21271(35) u 1.7 × 10−10 energy equivalent mdc2 3.005 062 62(24) × 10−10 J 7.9 × 10−8 in MeV 1 875.612 762(75) MeV 4.0 × 10−8 deuteron-electron mass ratio md/me 3 670.482 9550(78) 2.1 × 10−9 deuteron-proton mass ratio md/mp 1.999 007 50083(41) 2.0 × 10−10 deuteron molar mass NAmd M(d), Md 2.013 553 21271(35) × 10−3 kg mol−1 1.7 × 10−10 deuteron magnetic moment µd 0.433 073 457(18)× 10−26 J T−1 4.2 × 10−8 to Bohr magneton ratio µd/µB 0.466 975 4556(50)× 10−3 1.1 × 10−8 to nuclear magneton ratio µd/µN 0.857 438 2284(94) 1.1 × 10−8 deuteron-electron magnetic moment ratio µd/µe −4.664 345 537(50) × 10−4 1.1 × 10−8 deuteron-proton magnetic moment ratio µd/µp 0.307 012 2083(45) 1.5 × 10−8 Page 5 Source: Peter J. Mohr and Barry N. Taylor, CODATA Recommended Values of the Fundamental Physical Constants: 1998, Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, 1999 and Reviews of Modern Physics, Vol. 72, No. 2, 2000