Phys.Rev. C 97, 035505 (2018)

M.A.-P.Brown, for the UCNA Collaboration

New result for the neutron β-asymmetry parameter A₀ from UCNA

RADIOACTIVITY ¹n(β^-); measured neutrons, β, nβ(θ) using polarized neutrons from Ultracold Neutron (UCN) source at Los Alamos Neutron Science Center (LANSC, LANL); deduced precise value A₀ neutron-β^- asymmetry parameter, ratio of weak axial-vector to vector coupling constants g_A/g_V, and Cabibbo-Kobayashi-Maskawa (CKM) matrix element V_ud for 0+ 0+ superallowed β transitions; discussed systematic uncertainties. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.97.035505