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- W2598475742 abstract "Background: The $ensuremath{beta}$ decays of ${}^{3}$H and ${}^{6}$He can play an important role in testing nuclear wave-function calculations and fixing low-energy constants in effective-field theory approaches. However, there exists a large discrepancy between previous measurements of the ${}^{6}$He half-life.Purpose: Our measurement aims at resolving this long-standing discrepancy in the ${}^{6}$He half-life and providing a reliable $ft$ value and Gamow-Teller matrix element for comparison with theoretical ab initio calculations.Method: We measured the ${}^{6}$He half-life by counting the $ensuremath{beta}$-decay electrons with two scintillator detectors operating in coincidence.Results: The measured ${}^{6}$He half-life is $806.89ifmmodepmelsetextpmfi{}0.{11}_{mathrm{stat}}{}_{ensuremath{-}0.19}^{+0.23}{}_{mathrm{syst}}$ ms corresponding to a relative precision of $3ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}$. Calculating the statistical rate function we determined the $ft$ value to be $803.{04}_{ensuremath{-}0.23}^{+0.26}$ s.Conclusions: Our result resolves the previous discrepancy by providing a higher-precision result with careful analysis of potential systematic uncertainties. The result provides a reliable basis for future precision comparisons with ab initio calculations." @default.
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- W2598475742 date "2012-09-20" @default.
- W2598475742 modified "2023-09-23" @default.
- W2598475742 title "Precision measurement of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mrow /><mml:mn>6</mml:mn></mml:msup></mml:math>He half-life and the weak axial current in nuclei" @default.
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- W2598475742 doi "https://doi.org/10.1103/physrevc.86.035506" @default.
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