Dewey, M.
, Nico, J.
and Wietfeldt, F.
(2024),
Recoil-Order and Radiative Corrections to the aCORN Experiment, Physical Review C, [online], https://doi.org/10.1103/PhysRevC.110.015502, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956316
(Accessed October 10, 2025)
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Recoil-Order and Radiative Corrections to the aCORN Experiment
Published
Author(s)
, , Fred Wietfeldt
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. The corrected combined result is a = -0.10859 +/- 0.00125 (stat) +/- 0.00133 (sys), an increase in magnitude of 0.7 % compared to the overall relative standard uncertainty of 1.7 %, which is unchanged. The corresponding corrected result for the ratio of weak coupling constants \lambda = G_A/G_V is \lambda = -1.2737 +/- 0.0061. This improves agreement with previous a-coefficient experiments, in particular the 2020 aSPECT result.Citation
Physical Review C
Volume
110
Issue
1
Pub Type
Journals
Download Paper
Keywords
neutron beta decay, correlation coefficients, tests of Standard Model
Citation
Issues
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Created July 8, 2024, Updated March 17, 2025