From: physics. nist. gov/constants Fundamental Physical Constants- Complete Listing Relative std UNIVERSAL speed of light in vacuum c,co299792458 ms-l (exact) 4xx10 NA 12.566370614..×10-7NA (exact) electric constant 1/uoc 8.854187817×10-12F (exact) characteristic impedance 376.73031346 Newtonian constant of gravitation G 6673(10)×10-1 3kg-1s-21.5×10 G/hc6.707(10)×10-39 (Gev/c2)-21.5×10-3 Planck constant h 662606876(52)×10-34Js 7.8×10=8 In ev s 413566727(16)×10-15eV 3.9×10° h/2 九 1.054571596(82)×10-34Js 7.8×10-8 6.58211889(26)×10-16eVs 39×10-8 12 Planck length h/mpc=(hG/33)/2Ip 16160(12)×10-35 7.5×10- Planck time lp/c=(nG/c5)/2 53906(40)×10 7.5×10 ELECTROMAGNETIC elementary charge 1.602176462(63) 3.9×10 e/h2.417989491(95)×1014AJ 3.9×10-8 magnetic flux quantum h/2e 206783363681)×10-15Wb 3.9×10-8 conductance quantum 2e2/h 7748091696(28)×10-5S inverse of conductance quantum G0 12906.403786(47) 3.7×10-9 osephson constant 2e/h 483597898(19)×109 Hz v-I von Klitzing constant h/e2= uoc/ 25812.807572(95) 3.7×10 Bohr magneton eh/2me 927400899(37)×10-26JT-1 4.0×10-8 ineV T 5788381749(43)×10-5 evT-l 73×10-9 B/h13.99624624(56)×109HzT-1 4.0×10 B/hc46.6864521(19) m 4.0×10-8 B/k0.6717131(12) KT 1.7×10 nuclear magneton eh/2mp 505078317(20)×10-27JT-1 4.0×10 ineV t 3152451238(24)×10-8eVT 7.6×10-9 八N/h7.62259396(31) MHZ T 4.0×10-8 N/hc2.54262366(10)×10-2m-1T- 4.0×10-8 /k3.6582638(64)×10 KT 1.7×10 ATOMIC AND NUCLEAR fine-structure constante2/eohc 729735253327)×10-3 3.7× inverse fine-structure constant 137.03599976(50) Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, 1999 and Reviews of Modern Physics, Vol. 72, No. 2, 2000
From: physics.nist.gov/constants Fundamental Physical Constants — Complete Listing Relative std. Quantity Symbol Value Unit uncert. ur UNIVERSAL speed of light in vacuum c, c0 299 792 458 m s−1 (exact) magnetic constant µ0 4π × 10−7 N A−2 = 12.566 370614... × 10−7 N A−2 (exact) electric constant 1/µ0c2 ε0 8.854 187 817... × 10−12 F m−1 (exact) characteristic impedance of vacuum √µ0/0 = µ0c Z0 376.730 313 461... (exact) Newtonian constant of gravitation G 6.673(10) × 10−11 m3 kg−1 s−2 1.5 × 10−3 G/c 6.707(10) × 10−39 (GeV/c2)−2 1.5 × 10−3 Planck constant h 6.626 068 76(52)× 10−34 Js 7.8 × 10−8 in eV s 4.135 667 27(16)× 10−15 eV s 3.9 × 10−8 h/2π 1.054 571 596(82) × 10−34 Js 7.8 × 10−8 in eV s 6.582 118 89(26) × 10−16 eV s 3.9 × 10−8 Planck mass (c/G)1/2 mP 2.1767(16) × 10−8 kg 7.5 × 10−4 Planck length /mPc = (G/c3)1/2 lP 1.6160(12) × 10−35 m 7.5 × 10−4 Planck time lP/c = (G/c5)1/2 tP 5.3906(40) × 10−44 s 7.5 × 10−4 ELECTROMAGNETIC elementary charge e 1.602 176 462(63) × 10−19 C 3.9 × 10−8 e/h 2.417 989 491(95)× 1014 A J−1 3.9 × 10−8 magnetic flux quantum h/2e 80 2.067 833 636(81)× 10−15 Wb 3.9 × 10−8 conductance quantum 2e2 /h G0 7.748 091 696(28)× 10−5 S 3.7 × 10−9 inverse of conductance quantum G−1 0 12 906.403 786(47) 3.7 × 10−9 Josephson constanta 2e/h KJ 483 597.898(19)× 109 Hz V−1 3.9 × 10−8 von Klitzing constantb h/e2 = µ0c/2α RK 25 812.807 572(95) 3.7 × 10−9 Bohr magneton e/2me µB 927.400 899(37) × 10−26 J T−1 4.0 × 10−8 in eV T−1 5.788 381 749(43)× 10−5 eV T−1 7.3 × 10−9 µB/h 13.996 246 24(56)× 109 Hz T−1 4.0 × 10−8 µB/hc 46.686 4521(19) m−1 T−1 4.0 × 10−8 µB/k 0.671 7131(12) K T−1 1.7 × 10−6 nuclear magneton e/2mp µN 5.050 783 17(20) × 10−27 J T−1 4.0 × 10−8 in eV T−1 3.152 451 238(24) × 10−8 eV T−1 7.6 × 10−9 µN/h 7.622 593 96(31) MHz T−1 4.0 × 10−8 µN/hc 2.542 623 66(10) × 10−2 m−1 T−1 4.0 × 10−8 µN/k 3.658 2638(64)× 10−4 K T−1 1.7 × 10−6 ATOMIC AND NUCLEAR General fine-structure constant e2 /4π0c α 7.297 352533(27) × 10−3 3.7 × 10−9 inverse fine-structure constant α−1 137.035 999 76(50) 3.7 × 10−9 Page 1 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
From: physics. nist. gov/constants Fundamental Physical Constants- Complete listing Relative std ydberg constant a-mec/2h 10973731.568549(83) 7.6×10=12 3289841960368(25)×1015Hz 7.6×10- 2.17987190(17)×10 Roohc in ev 13.60569172(53) 3.9×10-8 Bohr radius a/4xR∞=4x∈0h2/me2ao 0.5291772083(19)×10-10m 3.7×10-9 Hartree energy e2/4TE0a0=2Roohc 435974381(34)×10-18J 78×10-8 In h/2me3.636947516(27)×10-4ev 27.2113834(1 quantum of circulation s-17.3×10-9 h/m 7273895032(53)×10-4m2s-17.3×10 Fermi coupling constant GF/(hc)31.166391)×10-5 86×10-6 weak mixing angled ow(on-shell scheme) sinew 0.2224(19) 87×10-3 electron mass 910938188(72)×10-31kg 79×10-8 in u, me= Ar(e)u(electron relative atomic mass times u) 54857991012)×10-4 2.1×10 energy equivalent 818710414(64)×10 7.9×10 n mev 0.510998902(21) Mev 4.0×10-8 electron -muon mass ratio ml/m14.8363210(15) 3.0×10-8 electron-tau mass ratio me/mx28755547)×10-4 1.6×10-4 electron-proton mass ratio me/mp5.446170232(12)×10-4 2.1×10 electron-neutron mass ratio 5438673462(12)×10-4 electron-deuteron mass ratio 27244371170(58)×10-4 2.1×10- electron to alpha particle mass ratio me/ml1.3709335611(29)×10-4 electron charge to mass quotient 1758820174(71)× Ckg 40×10-8 electron molar mass Name M(e),M5.485799110(12)×10-7 kg mol-12.1×10 Compton wavelength h/mec 2426310215(8)×10-12m 73×10-9 λC/2x=aao=a2/4xR NC 3861592642(28)×10 7.3×10-9 classical electron radius a ao 2817940285(31)×10-15m 1.1×10=8 Thomson cross section(8T/3)r2 0665245854(15)×10-28m 2.2×10 electron magnetic moment 928476362(37)×10-26JT-140×10-8 to bohr magneton ratio He/uB 11596521869(41) to nuclear magneton ratio /u -1838.2819660(39) 2.1×10 electron magnetic moment anomaly luel/uB-1 11596521869(41)×10-3 3.5×10-9 electron g-factor -2(1+ae) 2.0023193043737(82) 4.1×10-12 electron-muon letic moment ratio e/pp206766972063) 3.0×10-8 Page 2 Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, 1999 and Reviews of Modern Physics, Vol. 72, No. 2, 2000
From: physics.nist.gov/constants Fundamental Physical Constants — Complete Listing Relative std. Quantity Symbol Value Unit uncert. ur Rydberg constant α2mec/2h R∞ 10 973 731.568 549(83) m−1 7.6 × 10−12 R∞c 3.289 841 960368(25) × 1015 Hz 7.6 × 10−12 R∞hc 2.179 871 90(17) × 10−18 J 7.8 × 10−8 R∞hc in eV 13.605 691 72(53) eV 3.9 × 10−8 Bohr radius α/4π R∞ = 4π02 /mee2 a0 0.529 177 2083(19)× 10−10 m 3.7 × 10−9 Hartree energy e2 /4πε0a0 = 2R∞hc = α2mec2 Eh 4.359 743 81(34)× 10−18 J 7.8 × 10−8 in eV 27.211 3834(11) eV 3.9 × 10−8 quantum of circulation h/2me 3.636 947 516(27)× 10−4 m2 s−1 7.3 × 10−9 h/me 7.273 895 032(53)× 10−4 m2 s−1 7.3 × 10−9 Electroweak Fermi coupling constantc GF/(c)3 1.166 39(1) × 10−5 GeV−2 8.6 × 10−6 weak mixing angled θW (on-shell scheme) sin2 θW = s2 W ≡ 1 − (mW/mZ)2 sin2 θW 0.2224(19) 8.7 × 10−3 Electron, e− electron mass me 9.109 381 88(72)× 10−31 kg 7.9 × 10−8 in u, me = Ar(e) u (electron relative atomic mass times u) 5.485 799 110(12)× 10−4 u 2.1 × 10−9 energy equivalent mec2 8.187 10414(64) × 10−14 J 7.9 × 10−8 in MeV 0.510 998 902(21) MeV 4.0 × 10−8 electron-muon mass ratio me/mµ 4.836 332 10(15) × 10−3 3.0 × 10−8 electron-tau mass ratio me/mτ 2.875 55(47) × 10−4 1.6 × 10−4 electron-proton mass ratio me/mp 5.446 170 232(12) × 10−4 2.1 × 10−9 electron-neutron mass ratio me/mn 5.438 673 462(12)× 10−4 2.2 × 10−9 electron-deuteron mass ratio me/md 2.724 437 1170(58) × 10−4 2.1 × 10−9 electron to alpha particle mass ratio me/mα 1.370 933 5611(29) × 10−4 2.1 × 10−9 electron charge to mass quotient −e/me −1.758 820 174(71) × 1011 C kg−1 4.0 × 10−8 electron molar mass NAme M(e), Me 5.485 799 110(12)× 10−7 kg mol−1 2.1 × 10−9 Compton wavelength h/mec λC 2.426 310 215(18) × 10−12 m 7.3 × 10−9 λC/2π = αa0 = α2 /4π R∞ C 386.159 2642(28)× 10−15 m 7.3 × 10−9 classical electron radius α2a0 re 2.817 940 285(31) × 10−15 m 1.1 × 10−8 Thomson cross section (8π/3)r 2 e σe 0.665 245 854(15)× 10−28 m2 2.2 × 10−8 electron magnetic moment µe −928.476 362(37)× 10−26 J T−1 4.0 × 10−8 to Bohr magneton ratio µe/µB −1.001 159 6521869(41) 4.1 × 10−12 to nuclear magneton ratio µe/µN −1 838.281 9660(39) 2.1 × 10−9 electron magnetic moment anomaly |µe|/µB − 1 ae 1.159 652 1869(41) × 10−3 3.5 × 10−9 electron g-factor −2(1 + ae) ge −2.002 319 3043737(82) 4.1 × 10−12 electron-muon magnetic moment ratio µe/µµ 206.766 9720(63) 3.0 × 10−8 Page 2 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
From: physics. nist. gov/constants Fundamental Physical Constants-Complete listing Relative std Quantity Value uncert. lr electron-proton magnetic moment ratio ue/u -658.2106875(66) 10×10=8 electron to shielded proton magnetic moment ratio 658.2275954(71) l×10 (H2O, sphere,25°C) electron-neutron magnetic moment ratio pe/an 96092050(23) 2.4×10- electron-deuteron magnetic moment ratio -2143.923498(23) 1.1×10-8 electron to shielded helion magnetic moment ratio /864.05825510) 1.2×10-8 (gas, sphere,25°C) electron gyromagnetic ratio 2lueI/h ye 1.760859794(71)×1011s-1T-140×10- 28024.9540(11) MHzT-140×10-8 Muon, u muon mass 188353109(16)×10-28kg 84×10-8 in u, mu= Ar(u)u(muon relative atomic mass times u) 0.1134 8(34) 3.0×10 energy equivalent 1.69283332(14)×10-11J in mev 105.6583568(52) Mev 4.9×10-8 muon-electron mass ratio m/me206.7682657(63) 30×10-8 muon -tau mass ratio 94572(97)×10-2 muon-proton mass ratio m1/mp0.1126095173(34) 3.0×10-8 muon-neutron mass ratio m/mn0.124545079(34) muon molar mass NAmu M(),M40.34289168(34)×10-3 kg mol-13.0×10-8 muon Compton wavelength h/ 1173444197(35)×10-15m 2.9×10-8 1.86759444455)×10-15m 2.9×10=8 muon magnetic moment μμ -449044813(22)×10-26JT-1 to bohr magneton ratio -4.84197085(15)×10-3 3.0×10-8 to nuclear magneton ratio Au/uN 889059770(27) 3.0×10-8 muon magnetic moment anomaly p∥(eh/2m1)-1 116591602(64)×10-3 5.5×10- muon g-factor-2(1+ au) gt 2.0023318320(13) 6.4×10-10 magnetic mo ratio μ 3.18334539(10) 3.2×10 au. T 316788(52)×10-27 1.6×10-4 inu, mt= Ar()u(tau relative atomic mass times u) 1.90774(31) 1.6×10-4 energy equivalent c 284715(46)×10-10 J 1.6×10 in me v 1777.05(29) Mev 1.6×10-4 Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, 1999 and Reviews of Modern Physics, Vol. 72, No. 2, 2000
From: physics.nist.gov/constants Fundamental Physical Constants — Complete Listing Relative std. Quantity Symbol Value Unit uncert. ur electron-proton magnetic moment ratio µe/µp − 658.2106875(66) 1.0 × 10−8 electron to shielded proton magnetic moment ratio µe/µ0 p − 658.227 5954(71) 1.1 × 10−8 (H2O, sphere, 25 ◦C) electron-neutron magnetic moment ratio µe/µn 960.920 50(23) 2.4 × 10−7 electron-deuteron magnetic moment ratio µe/µd −2 143.923 498(23) 1.1 × 10−8 electron to shielded helione magnetic moment ratio µe/µ0 h 864.058 255(10) 1.2 × 10−8 (gas, sphere, 25 ◦C) electron gyromagnetic ratio 2|µe|/ γe 1.760 859 794(71) × 1011 s−1 T−1 4.0 × 10−8 γe/2π 28 024.9540(11) MHz T−1 4.0 × 10−8 Muon, µ− muon mass mµ 1.883 531 09(16)× 10−28 kg 8.4 × 10−8 in u, mµ = Ar(µ) u (muon relative atomic mass times u) 0.113 428 9168(34) u 3.0 × 10−8 energy equivalent mµc2 1.692 833 32(14) × 10−11 J 8.4 × 10−8 in MeV 105.658 3568(52) MeV 4.9 × 10−8 muon-electron mass ratio mµ/me 206.768 2657(63) 3.0 × 10−8 muon-tau mass ratio mµ/mτ 5.945 72(97) × 10−2 1.6 × 10−4 muon-proton mass ratio mµ/mp 0.112 609 5173(34) 3.0 × 10−8 muon-neutron mass ratio mµ/mn 0.112 454 5079(34) 3.0 × 10−8 muon molar mass NAmµ M(µ), Mµ 0.113 428 9168(34)× 10−3 kg mol−1 3.0 × 10−8 muon Compton wavelength h/mµc λC,µ 11.734 441 97(35) × 10−15 m 2.9 × 10−8 λC,µ/2π C,µ 1.867 594444(55) × 10−15 m 2.9 × 10−8 muon magnetic moment µµ −4.490 448 13(22) × 10−26 J T−1 4.9 × 10−8 to Bohr magneton ratio µµ/µB −4.841 97085(15) × 10−3 3.0 × 10−8 to nuclear magneton ratio µµ/µN −8.890 597 70(27) 3.0 × 10−8 muon magnetic moment anomaly |µµ|/(e/2mµ) − 1 aµ 1.165 916 02(64)× 10−3 5.5 × 10−7 muon g-factor −2(1 + aµ) gµ −2.002 331 8320(13) 6.4 × 10−10 muon-proton magnetic moment ratio µµ/µp −3.183 345 39(10) 3.2 × 10−8 Tau, τ − tau massf mτ 3.167 88(52) × 10−27 kg 1.6 × 10−4 in u, mτ = Ar(τ) u (tau relative atomic mass times u) 1.907 74(31) u 1.6 × 10−4 energy equivalent mτc2 2.847 15(46) × 10−10 J 1.6 × 10−4 in MeV 1 777.05(29) MeV 1.6 × 10−4 Page 3 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
From: physics. nist. gov/constants Fundamental Physical Constants-Complete Listing Relative std Quantity Symbol Value Unit uncert. Il tau-electron mass ratio n/me3477.60(57) 16×10-4 tau-muon mass ratio i/ 168188(27) 1.6×10 tau-proton mass ratio m/mp1.89396(31) 1.6×10 tau-neutron mass ratio m/mn189135(31) 1.6×10 tau molar mass NAm M(),M11.90774(31)×10-3 kg mol-11.6×10- tau Compton wavelength h/mc ic 069770(11)×10-15 1.6×10-4 0.l11042(18)×10 15 Proton, p proton mass 1.67262158(13)×10-27kg 79×10-8 Ar (p)u(pr relative atomic mass times u) 1.00727646688(13) 1.3×10-10 nergy equivalent mDC 1.50327731(12)×10-10J .9 in mev 938.271998(38) Mev 4.0×10-8 proton-electron mass ratio m1p/me1836.1526675(39) 2.1×10-9 proton-muon mass ratio mp/m8.88024408(27) 30×10-8 proton-tau mass ratio mp/m:0.527994(86) 16×10-4 proton-neutron mass ratio mp/mn0.99862347855(58) 58×10=10 proton charge to mass quotient 957883408(38)×107 C kg 4.0×10-8 proton molar mass NAmp M(p),M1.00727646688(13)×10-3 kg mol-11.3×10-10 proton Compton wavelength h/mpc A 1.321409847(10)×10-15m 7.6×10-9 0.2103089089(16)×10~15m 7.6×10-9 proton magnetic moment 1410606633(58×10-26JT-14.1×10-8 to bohr magneton ratio p/B1.521032203(15)×10-3 1.0×10-8 to nuclear magneton ratio 2.792847337029) 10×10-8 proton g-factor 2up/uN 5.585694675(57) 10×10-8 Toton-neutron magnetic moment ratio 1.45989805(34) 2.4×10-7 shielded proton magnetic moment 1.410570399(59)×10-26JT-1 4.2×10-8 (H2O, sphere, 25C to bohr magneton ratio p/μB 1.520993132(16)×10-3 1.1 to nuclear magneton rati Hm/N2.792775597(31) 1.1×10=8 proton magnetic shielding correction I-un/u 25687(15)×10-6 5.7×10-4 (H2O, sphere,25°C) proton gyromagnetic ratio 2pp/h 26752222(11)×108 4.l×10-8 /2r 42.5774825(18) MHzT-14.1×10 shielded proton gyromagnetic ratio 2un/h Yp 267515341(11)×108 S-I T 4.2×10-8 (H2O, sphere,25°C) y/2x425763888(18) MHzT-14.2×10-8 Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, 1999 and Reviews of Modern Physics, Vol. 72, No. 2, 2000
From: physics.nist.gov/constants Fundamental Physical Constants — Complete Listing Relative std. Quantity Symbol Value Unit uncert. ur tau-electron mass ratio mτ/me 3 477.60(57) 1.6 × 10−4 tau-muon mass ratio mτ/mµ 16.8188(27) 1.6 × 10−4 tau-proton mass ratio mτ/mp 1.893 96(31) 1.6 × 10−4 tau-neutron mass ratio mτ/mn 1.891 35(31) 1.6 × 10−4 tau molar mass NAmτ M(τ), Mτ 1.907 74(31) × 10−3 kg mol−1 1.6 × 10−4 tau Compton wavelength h/mτc λC,τ 0.697 70(11) × 10−15 m 1.6 × 10−4 λC,τ/2π C,τ 0.111 042(18) × 10−15 m 1.6 × 10−4 Proton, p proton mass mp 1.672 621 58(13) × 10−27 kg 7.9 × 10−8 in u, mp = Ar(p) u (proton relative atomic mass times u) 1.007 276 466 88(13) u 1.3 × 10−10 energy equivalent mpc2 1.503 277 31(12)× 10−10 J 7.9 × 10−8 in MeV 938.271 998(38) MeV 4.0 × 10−8 proton-electron mass ratio mp/me 1 836.152 6675(39) 2.1 × 10−9 proton-muon mass ratio mp/mµ 8.880 244 08(27) 3.0 × 10−8 proton-tau mass ratio mp/mτ 0.527 994(86) 1.6 × 10−4 proton-neutron mass ratio mp/mn 0.998 623 478 55(58) 5.8 × 10−10 proton charge to mass quotient e/mp 9.578 834 08(38) × 107 C kg−1 4.0 × 10−8 proton molar mass NAmp M(p), Mp 1.007 276 466 88(13)× 10−3 kg mol−1 1.3 × 10−10 proton Compton wavelength h/mpc λC,p 1.321 409 847(10)× 10−15 m 7.6 × 10−9 λC,p/2π C,p 0.210 308 9089(16) × 10−15 m 7.6 × 10−9 proton magnetic moment µp 1.410 606 633(58) × 10−26 J T−1 4.1 × 10−8 to Bohr magneton ratio µp/µB 1.521 032 203(15) × 10−3 1.0 × 10−8 to nuclear magneton ratio µp/µN 2.792 847 337(29) 1.0 × 10−8 proton g-factor 2µp/µN gp 5.585 694 675(57) 1.0 × 10−8 proton-neutron magnetic moment ratio µp/µn −1.459 898 05(34) 2.4 × 10−7 shielded proton magnetic moment µ0 p 1.410 570 399(59) × 10−26 J T−1 4.2 × 10−8 (H2O, sphere, 25 ◦C) to Bohr magneton ratio µ0 p/µB 1.520 993 132(16) × 10−3 1.1 × 10−8 to nuclear magneton ratio µ0 p/µN 2.792 775 597(31) 1.1 × 10−8 proton magnetic shielding correction 1 − µ0 p/µp σ0 p 25.687(15) × 10−6 5.7 × 10−4 (H2O, sphere, 25 ◦C) proton gyromagnetic ratio 2µp/ γp 2.675 222 12(11) × 108 s−1 T−1 4.1 × 10−8 γp/2π 42.577 4825(18) MHz T−1 4.1 × 10−8 shielded proton gyromagnetic ratio 2µ0 p/ γ 0 p 2.675 153 41(11)× 108 s−1 T−1 4.2 × 10−8 (H2O, sphere, 25 ◦C) γ 0 p/2π 42.576 3888(18) MHz T−1 4.2 × 10−8 Neutron, n Page 4 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
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, 2000
From: 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 C,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