Speaker
Stefan Baessler
(University of Virginia)
Description
We report on a precise measurement of the antineutrino-electron angular
correlation (the $a$ coefficient) in free neutron beta-decay obtained with the
$a$SPECT experiment. The $a$ coefficient is inferred from the recoil
energy spectrum of the protons. Protons are detected in $4\pi$ in the
$a$SPECT spectrometer using magnetic adiabatic collimation with
an electrostatic filter. We have obtained $a = -0.10430(84)$ (as
published in Phys. Rev. C 101, 055506 (2020)) which is the most precise measurement of the neutron $a$ coefficient to date. We also give a preview on further
analysis efforts and our derivation of the Fierz term.
Primary author
Stefan Baessler
(University of Virginia)
