3H

β- Decay Evaluated Data



Measurements
1947NO01: 3H; measured T1/2.
1950JE60: 3H; measured T1/2.
1951JO15: 3H; measured T1/2.
1952LA19: 3H.
1955JO20: 3H; measured T1/2.
1958FR50: 3H.
1958GR93: 3H.
1958PO64: 3H.
1959PO78: 3H.
1961JOZZ: 3H.
1961PI01: 3H; measured not abstracted; deduced nuclear properties.
1963EIZZ: 3H; measured T1/2.
1964MO29: 3H; measured not abstracted; deduced nuclear properties.
1967JO09: 3H; measured not abstracted; deduced nuclear properties.
1967JO10: 3H; measured not abstracted; deduced nuclear properties.
1969DA18: 3H; measured Eβ; deduced Qβ, ν rest mass, ft.
1969SA21: 3H; measured Eβ; deduced ν rest mass, Gamow-Teller matrix element.
1970LE15: 3H; measured Eβ; deduced ft.
1972BE11: 3H; analyzed Eβ; deduced Q, ft-value, axial-vector matrix element.
1973PI01: 3H; measured Eβ; deduced end-point energy, log ft, Q.
1974RO08: 3H; measured Eβ.
1975SM02: 3H; measured atomic mass.
1976TR07: 3H; measured Eβ.
1977RUZZ: 3H(β-); analyzed data; deduced T1/2.
1980UN01: 3H.
1981LU07: 3H; measured Eβ, Iβ; deduced neutrino rest mass limit, β-decay energy.
1983DE47: 3H(β-); measured β-spectra; deduced β-endpoint energy, antineutrino mass upper limit.
1985BO34: 3H(β-); measured β-spectrum in Valine molecule, end-point energy; deduced neutrino mass upper limit. 3H, 3He deduced atomic mass difference.
1985BO53: 3H(β-); measured Eβ, Iβ; deduced β-endpoint energy, neutrino mass lower limit. 3He, 3H deduced mass difference.
1985RU09: 3H(β-); measured I(β), I(ce).
1985SI07: 3H(β-); measured Eβ, endpoint energy; deduced Q.
1986FR09: 3H(β-); measured β-spectrum endpoint; deduced neutrino mass upper limit.
1986FR13: 3H(β-); measured endpoint region of β-spectrum; deduced an upper limit for mass of ν(bar)(e).
1986GE03: 3H(β-); measured β-spectra; deduced energy loss uncertainty exclusion.
1986KAZL: 3H(β-); measured Eβ; deduced ν mass limit.
1986SIZU: 3H(β-); measured Eβ, Iβ; deduced T1/2. High precision.
1987BO07: 3H(β-); measured beta spectrum; deduced neutrino mass.
1987BO35: 3H(β-); analyzed data; deduced β-endpoint energy, neutrino mass.
1987BU28: 3H.
1987GE04: 3H(β-); measured maximum, average β- energies; deduced heating powers.
1987KAZD, 1987KAZG: 3H(β-); measured Eβ; deduced ν mass upper limit.
1987OL04: 3H(β-); measured T1/2.
1987SI01: 3H(β-); measured T1/2, β-endpoint energy; deduced (G(a)/G(V))x<σ(τ)>.
1987WI07: 3H(β-); measured molecular beta spectrum; deduced electron-antineutrino mass limit.
1988BRZN: 3H(β-); measured Eβ. 3H, 3He deduced mass difference.
1988CH45: 3H(β-); measured β-detector efficiency.
1988KA12, 1988KA32: 3H(β-); measured E(β); deduced β-endpoint energy, electron antineutrino mass upper limit.
1988KU03: 3H(β-); measured β-endpoint energy; deduced neutrino mass upper limit.
1988WI07: 3H(β-); measured β-spectra; deduced neutrino mass upper limit.
1989BO06, 1989BOZS: 3H(β-); measured external bremsstrahlung spectrum; deduced electron antineutrino mass upper limit.
1989KAYX: 3H(β-); measured Eβ. Neutrino mass.
1989ST05: 3H(β-); measured E(γ), I(γ). 3H, 3He deduced atomic mass difference.
1989TA08: 3H(β-); measured β-activity; deduced quenching correction role in nuclide identification.
1991BU12: 3; measured bremsstrahlung spectra; deduced β-decay end point. 3H, 3He deduced mass difference.
1991BU13: 3H; measured T1/2.
1991KA40: 3H(β-); measured β-spectrum Kurie plot; deduced electron anti-neutrino mass upper limit, 95% confidence limit.
1991KA41: 3H(β-); measured β-spectra.
1991RO07: 3H(β-); measured β-decay spectrum shape; deduced electron antineutrino mass upper limit.
1992BAZT: 3H(β-); measured β-spectra; deduced improved limit for m(ν).
1992BU13: 3H(β-); measured internal, external bremsstrahlung X-ray spectra following β-decay; deduced maximum electron kinetic energy.
1992HO09: 3H(β-); measured β-spectra; deduced ν-mass upper limit.
1992TA23: 3H(β-); measured γ-ray energy distribution; deduced upper limit for Eγ.
1993BA08, 1993BAZF: 3H(β-); measured Eβ near endpoint; deduced (ν-bar)(e) rest mass. 3H, 3He deduced mass difference.
1993SU32: 3H(β-); measured β-endpoint energy; deduced ((ν-bar)(e)), mass upper limit.
1993WE03: 3H(β-); measured β-spectrum endpoint energy; deduced electron-antineutrino mass upper limit. 3H, 3He deduced atomic mass difference.
1994GR04: 3H(β-); measured β-counting rates, spectra
1994GR22: 3H(β-); measured activity vs quench values.
1994HO11: 3H(β-); measured integral β-counting rates, high accuracy modifield integral counting method.
1994WA35: 3H(β-); measured β-spectra, Eβ distributions.
1995BA82: 3H(β-); measured direct limit on heavy neutrino.
1995BE35: 3H(β-); measured β-spectrum in end-point region; deduced ν rest mass, 95% confidence limit.
1995GR04: 3H(β-); measured spectra, β-distributions maximum points.
1995ST26: 3H; measured β end point energy spectra; deduced anomalous structure, ν-mass implications.
1996SZ04: 3H(β-); measured βγ-, (e)γ-, (X-ray)γ-coin.
1997KA29: 3H(β-); analyzed, reviewed neutrino mass estimates from β-decay data analyses.
1997ZI03: 3H(β-); compiled, reviewed data; deduced consistency of national 3H standard disseminated by several laboratories.
1998AK06: 3H(β-); measured T1/2 difference for atomic, molecular tritium.
1998LO14: 3H(β-); measured β-spectrum in end-point region; deduced origin of spectrum anomaly, neutrino mass upper limit.
1998LO21: 3H(β-); measured β spectra; deduced neutrino rest mass upper limit.
1998VA22: 3H(β-); measured Eβ, Iβ(H, θ); deduced asymmetry coefficient.
1999BB29: 3H(β-); analyzed β spectrum; deduced neutrino mass limit.
1999HA46: 3H(β-); measured β spectra; deduced electron screening potential.
1999LO09, 1999LO10, 1999LO23: 3H(β-); measured β spectra; deduced endpoint energy, neutrino mass limit.
1999WE13: 3H(β-); measured β spectra; deduced endpoint energy, neutrino mass limit.
2000AK09: 3H(β-); analyzed T1/2 for atomic, molecular tritium, related data.
2000BO26, 2000BO32: 3H(β-); measured Eβ, Iβ; deduced ν mass upper limit.
2000DE16, 2000ER02: 3H(β-); measured Eβ, Iβ.
2000DE20: 3H(β-); measured Eβ; deduced neutrino mass limit.
2000LO08: 3H(β-); analyzed β-spectra anomalies; neutrino mass upper limit.
2000LO09: 3H(β-); measured Eβ, Iβ; deduced ν mass upper limit.
2000LU17: 3H(β-); compiled, evaluated T1/2.
2001BO06: 3H(β-); measured Eβ, Iβ; deduced neutrino mass limits.
2001LO02: 3H(β-); measured Eβ, Iβ; deduced neutrino mass limits.
2002BO27, 2002BO31: 3H(β-); analyzed Eβ; deduced neutrino mass.
2003KR17: 3H(β-); measured Eβ; deduced neutrino mass limits.
2004AK16: 3H(β-); measured chemical shift in decay constant between atomic and molecular tritium; deduced atomic tritium T1/2.
2005AK04: 3H(β-); analyzed data; deduced bare triton decay T1/2, coupling constants ratio.
2005DO15: 3H(β-); calculated Eβ, effect of external electromagnetic wave field. Implications for neutrino mass determination discussed.
2005KR03: 3H(β-); measured Eβ; deduced neutrino mass limit.
2006BI13: 3H(β-); analysed data; deduced neutrino mass limit and spectrum shapes.
2006WE03: 3H(β-); compiled, analyzed decay data, neutrino mass limits.
2010OT02: 3H(β-); measured Ie, Ee; deduced β-spectrum, neutrino mass.
2011AS10: measured 3H decay; deduced anti-neutrino mass.
2013BI07: 3H(β-); measured decay products, Eβ, Iβ.
2016PO08: 3H(β-); measured decay products; deduced exponential nature of nuclear decay.
2017AB05: 3H(β-); measured decay products, Eβ, Iβ; deduced β-spectrum.

Measured half-life for 3H(β-)3He

Recommended value (September, 2015): 12.323 ± 0.020 years (Weighted Average Method: uncertainties of (1955JO20) and (1977RUZZ) adjusted to
12.262 ± 0.030 and 12.3232 ± 0.0246 as suggested in (2000LU17).)
Summary Table of Uncertainty Analysis:         Table 03H preview (PDF)  
Measured values: 12.33 ± 0.02 years (2000Unterweger: see also 12.43 ± 0.05 years in (1980UN01).)
12.31 ± 0.03 years (1991BU13: see also 12.29 ± 0.15 years in (1987BU28).)
12.279 ± 0.033 years (1988Akulov; Akulov et al, Zh. Tekh. Fiz. 14 (1988) 940; Sov. Tech. Phys. Lett. 14 (1988) 416.
See discussion on a comparison of the molecular lifetime vs. the atomic lifetime in (2004AK16),
where T1/2(atomic) ≈ 12.264 ± 0.018 years is obtained.)
          12.38 ± 0.03 / 0.04 years (1987OL04 / 1989Oliver)
12.32 ± 0.03 years (1987SI01)
12.3232 ± 0.0043 years (1977RUZZ: see also 12.346 ± 0.002 years in (1967JO09) and 12.355 ± 0.010 years in (1963EIZZ).)
12.25 ± 0.08 years (1967JO10)
12.31 ± 0.13 years (1966Merritt; Merritt and Taylor, Chalk River Rept. AECL-2510 (1966))
12.58 ± 0.18 years (1958PO64)
12.262 ± 0.004 years (1955JO20)
12.41+0.15-0.25 years (1951JO15)
12.46 ± 0.1 years   (1950JE60)
12.1 ± 0.5 years (1947NO01)
10.7 ± 2.0 years (1947GO08)
Other Reviews: 12.312 ± 0.025 years (DDEP)
12.312 ± 0.011 years (2006MA57)
12.320 ± 0.022 years (2000LU17)

Previous Measurements

 

Reference Method or forms of 3H sources End Point Energy (keV) Heat Output (W/γ)
(1952LA19) magnetic 17.95 ± 0.1   (1950JE60) 0.321 ± 0.003
(1958FR50) mass 18.65 ± 0.2 a (1958GR93) 0.319 ± 0.001
(1959PO78) magnetic 18.61 ± 0.1   (1958PO64) 0.312 ± 0.001
(1964MO29) mass   18.47 ± 0.17 a (1961JOZZ) 0.3244 ± 0.0013
(1969SA21) electrostatic   18.70 ± 0.06 b (1961PI01) 0.3240 ± 0.0009
(1969DA18) magnetic 18.570 ± 0.075 Average Eβ (keV)
(1970LE15) 3H implanation 18.540 ± 0.095 (1950JE60) 5.69 ± 0.04; calorimetry
(1972BE11) magnetic-electrostatic 18.610 ± 0.016 (1958GR93) 5.57 ± 0.01; calorimetry
(1973PI01) magnetic 18.578 ± 0.040 (1961PI01) 5.73 ± 0.03; calorimetry
(1974RO08) magnetic 18.648 ± 0.026
(1975SM02) mass difference 18.559 ± 0.007
(1976TR07) magnetic 18.575 ± 0.013
(1981LU07) magnetic 18.577 ± 0.013
(1983DE47) thermal diffuse 18.562 ± 0.006
(1985SI07) 3H implanation 18.577 ± 0.007
(1985BO34) magnetic 18.5842 ± 0.0016
(1987BO07) valine 18.5794 ± 0.004  
(1993BA08) moleculare tritium 18.5748 ± 0.0006
(1993SU32) C14H15T6O2N3 18.5783 ± 0.0051
(1995ST26) gaseous tritium 18.5685 ± 0.002  
(2003KR17) gaseous tritium 18.5705
a) Assumes anti-neutrino mass to be zero.
b) Not correct for resolution effects.

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Last modified: 21 May 2018