Phys.Rev.Lett. 132, 102501 (2024)

M.Beck, W.Heil, Ch.Schmidt, S.Baessler, F.Gluck, G.Konrad, U.Schmidt

Reanalysis of the β - ν-bar_e Angular Correlation Measurement from the aSPECT Experiment with New Constraints on Fierz Interference

RADIOACTIVITY ¹NN(β^-); analyzed 4π by the aSPECT spectrometer data; deduced he electron-antineutrino angular correlation (a coefficient) in free neutron decay inferred from the recoil energy spectrum of the protons, b, the Fierz interference parameter, implications for the standard model.

doi: 10.1103/PhysRevLett.132.102501