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29 March 2024
 
  » arxiv » 1110.5531

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Precision Measurement of the 6He Half-Life and the Weak Axial Current in Nuclei
A. Knecht ; R. Hong ; D.W. Zumwalt ; B.G. Delbridge ; A. Garcia ; P. Mueller ; H.E. Swanson ; I.S. Towner ; S. Utsuno ; W. Williams ; C. Wrede ;
Date 25 Oct 2011
AbstractStudies 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 3x10^(-4). Our value of 806.89 pm 0.11(stat)^{+0.23}_{-0.19}(syst) ms resolves a major discrepancy between previous measurements. Calculating the statistical rate function we determined the ft-value to be 803.04 ^{+0.26}_{-0.23} s. The extracted Gamow-Teller matrix element agrees within a few percent with ab-initio calculations.
Source arXiv, 1110.5531
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