Recoil-order and radiative corrections to the aCORN experiment

Authors

F. E. Wietfeldt
W. A. Byron
B. Collett
M. S. Dewey
T. R. Gentile
F. Glück
M. T. Hassan
G. L. Jones
Alexander Komives, DePauw UniversityFollow
J. S. Nico
E. J. Stephenson

Document Type

Article

Publication Date

7-8-2024

Abstract

The aCORN experiment measures the electron-antineutrino correlation 𝑎 coefficient in free neutron decay. We update the previous aCORN results [G. Darius et al., Phys. Rev. Lett. 119, 042502 (2017) and M. T. Hassan et al., Phys. Rev. C 103, 045502 (2021)] 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⁢(stat)±0.00134⁢(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, and the corresponding value of 𝑎0, useful for comparing to proton recoil measurements, is 𝑎0=−0.1053±0.0018. This improves agreement with previous 𝑎-coefficient experiments, in particular the 2020 aSPECT result [M. Beck et al., Phys. Rev. C 101, 055506 (2020)].

DOI

10.1103/PhysRevC.110.015502

Comments

Version of record available via DOI

Recommended Citation

Wietfeldt, F. E., Byron, W. A., Collett, B., Dewey, M. S., Gentile, T. R., Glück, F., Hassan, M. T., Jones, G. L., Komives, A., Nico, J. S., & Stephenson, E. J. (2024). Recoil-order and radiative corrections to the aCORN experiment. Physical Review C, 110(1). https://doi.org/10.1103/PhysRevC.110.015502