Knecht A, Hong R, Zumwalt DW, Delbridge BG, García A, Müller P, Swanson HE, Towner IS, Utsuno S, Williams W, Wrede C. Precision measurement of the 6He half-life and the weak axial current in nuclei.
Phys Rev Lett 2012;
108:122502. [PMID:
22540577 DOI:
10.1103/physrevlett.108.122502]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Indexed: 05/31/2023]
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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