The aCORN experiment reports updated a-coefficient results in free neutron decay, suggesting improved agreement with past weak interactions metrics.
The aCORN experiment measures the electron-antineutrino a-coefficient in free neutron decay. We update the previous aCORN results to include radiative and recoil corrections to first order, and discuss a key issue in the comparison of results from different a-coefficient experimental methods when these effects are considered. The corrected combined result is ā = -0.10779 ± 0.00125\, ( stat) ± 0.00133\, ( sys), averaged over the full Fermi neutron beta spectrum. The corresponding corrected result for the ratio of weak coupling constants λ= GA/GV is λ= -1.2712 ± 0.0061. This improves agreement with previous a-coefficient experiments, in particular the 2020 aSPECT result
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E. et al. (2023) studied this question.
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