Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session C14: Mini-Symposium:The Neutron Lifetime Anomaly - current status
1:30 PM–3:06 PM,
Saturday, April 13, 2019
Sheraton
Room: Plaza Court 3
Sponsoring
Unit:
DNP
Chair: Nadia Fomin, University of Tennessee
Abstract: C14.00004 : The UCNτ measurement of the free neutron lifetime: overview and status report*
2:30 PM–2:42 PM
Presenter:
Christopher Cude-Wood
(Los Alamos national Laboratory)
Author:
Christopher Cude-Wood
(Los Alamos national Laboratory)
Collaboration:
UCNTau
The UCNτ experiment measures the mean decay lifetime of the free neutron. Ultracold neutrons (UCN) from the Los Alamos ultracold neutron facility are loaded into an asymmetric trap wherein they are confined by gravity and an array of permanent magnets, and, after varying storage times, the surviving UCN are counted in-situ. The recent installation of a preconditioning storage volume has improved the ability to normalize the number of neutrons loaded into the trap for each data run by partially removing the effect of the pulsed nature of the Los Alamos UCN source. The experiment has completed acquiring production data during two annual accelerator run cycles, leading to a statistical uncertainty on the neutron lifetime well below 0.5 s. We will present the status of the analysis and the ongoing multiyear production run.
*This work was funded by DOE low energy nuclear physics and by LANL LDRD.
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