Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session LJ: Mini-Symposium on Fundamental Neutron Physics V
9:00 AM–11:45 AM,
Saturday, October 27, 2018
Hilton Room: Kona 5
Chair: Nadia Fomin, University of Tennessee
Abstract ID: BAPS.2018.HAW.LJ.8
Abstract: LJ.00008 : Preliminary results on Fierz Interference from the most-recent UCNA data*
10:45 AM–11:00 AM
The Fierz Interference term, $b$ in the Standard Model expression of the neutron beta decay rate, probes Beyond Standard Model physics by acting as a test of scalar and tensor couplings. It manifests, experimentally, in neutron decay by modifying the decay beta energy spectrum. In the past, the Ultracold Neutron Asymmetry experiment (UCNA) has reported on several measurements of the beta decay asymmetry, $A$, in the expression above. UCNA measures the neutron decay products of a trap filled with polarized ultracold neutrons whose decay products are directed, by a 1 T magnetic field, to detectors on either side of this trap. Due to the precise energy reconstruction needed for $A$, UCNA is able to provide a measurement of the beta decay energy spectrum and, hence, a measure of $b$ as well. The UCNA collaboration has previously set limits on $b$ using an older dataset. Here, we provide an overview of analysis focused on the most recent two-year span of data taken for UCNA. Furthermore, we present the results of implementing new calibration and analysis techniques, including using the energy dependence of $A$ to extract $b$.
*DOE-ONP (DE-FG02-08ER41557, DE-SC0014622, DE-FG02-97ER41042). NSF (1002814, 1005233, 1102511, 1205977, 1306997, 1307426, 1506459, and 1615153). LDRD (20110043DR).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.LJ.8
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700