Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Y03: Selected Topics in Fundamental Symmetries and the Intensity Frontier
1:30 PM–3:18 PM,
Tuesday, April 16, 2019
Sheraton
Room: Plaza E
Sponsoring
Units:
DPF DNP
Chair: Nadia Fomin, University of Tennessee
Abstract: Y03.00003 : An Improved Measurement of the Neutron Decay Beta-Neutrino Correlation with the aCORN Experiment*
2:42 PM–3:18 PM
View Presentation
Abstract
Presenter:
Fred E Wietfeldt
(Tulane University)
Author:
Fred E Wietfeldt
(Tulane University)
Collaboration:
aCORN collaboration
The decay of the free neutron into a proton, electron, and antineutrino is the simplest example of nuclear beta decay. The electron-antineutrino correlation (a-coefficient) is one of several important experimental parameters of neutron decay. Together these parameters can be used to determine the charged weak couplings of neutrons and protons, measure the CKM matrix element Vud, and conduct precision low energy tests of physics beyond the Standard Model. The aCORN experiment uses a novel “wishbone asymmetry” method that does not require detailed proton spectroscopy to measure the neutron a-coefficient The first aCORN run in 2013–2014 produced the most precise measurement to date. The second run in 2015–2016 on the new high-flux beamline NG-C at the NIST Center for Neutron Research collected a ten-times larger data set. Details of the experiment and results from the NG-C run will be presented.
*NSF, NIST, DOE
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