BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Wenjiang Fan \, UVA- Department of Physics\n\n
The Nab collab oration at the Spallation Neutron Source (SNS) aims to measure the electro n-neutrino correlation parameter "\;a"\; with a relative uncertain ty of about 10^{-3}\, and the Fierz interference term "\;b"\; with absolute uncertainty of 3 x 10^{-3}. Nab will use a novel "\;time of flight"\; (TOF) EM field spectrometer and segmented Si detectors. The scientific motivation is to provide an independent measurement of the rati o of axial-vector to vector coupling constants of the nucleon to an uncert ainty of 0.03% and to test the unitarity of the CKM quark mixing matrix. I n the Nab experiment\, "\;a"\; is determined by combined precise d eterminations of the electron energy and the proton time of flight. In thi s talk\, we present the motivation of the Nab experiment\, the principle a nd the uncertainty analysis of the measurement of &ldquo\;a&rdquo\;.
\n DTSTART:20160419T193000Z LOCATION:Physics Building\, Room 204 SUMMARY:Precise measurement of the electron-neutrino correlation in neutron beta decay END:VEVENT END:VCALENDAR