Recoil-Order and Radiative Corrections to the aCORN Experiment

2023/06/26 by F. E. Wietfeldt, W. A. Byron, Wietfeldt, F. E. +18
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #Radiation Detection and Scintillator Technologies

paper · pdf · doi:10.48550/arxiv.2306.15042

openalex publication_date 2023/06/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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 a = -0.10779 ± 0.00125 (\rm stat) ± 0.00133 (\rm sys), averaged over the full Fermi neutron beta spectrum. The corresponding corrected result for the ratio of weak coupling constants λ= G_A/G_V is λ= -1.2712 ± 0.0061. This improves agreement with previous a-coefficient experiments, in particular the 2020 aSPECT result

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