Precision measurement of the 6He half-life and the weak axial current in nuclei |
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Authors: | Knecht A Hong R Zumwalt D W Delbridge B G García A Müller P Swanson H E Towner I S Utsuno S Williams W Wrede C |
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Affiliation: | Department of Physics and Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA. knechta@uw.edu |
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Abstract: | Studies of 6He beta decay along with tritium can play an important role in testing ab initio nuclear wave-function calculations and may allow for fixing low-energy constants in effective-field theories. Here, we present an improved determination of the 6He half-life to a relative precision of 3×10(-4). Our value of 806.89±0.11(stat)(-0.19syst)(+0.23) ms resolves a major discrepancy between previous measurements. Calculating the statistical rate function we determined the ft value to be 803.04(-0.23)(+0.26) s. The extracted Gamow-Teller matrix element agrees within a few percent with ab initio calculations. |
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