Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session E03: Fundamental Symmetries I
8:30 AM–10:42 AM,
Friday, November 9, 2018
Holiday Inn Knoxville Downtown
Room: Parlor
Chair: Jason Fry, University of Virginia
Abstract ID: BAPS.2018.SES.E03.1
Abstract: E03.00001 : Update on the BL2 in-beam measurement of the neutron lifetime*
8:30 AM–8:42 AM
Presenter:
Jimmy Caylor
(University of Tennessee)
Author:
Jimmy Caylor
(University of Tennessee)
Collaboration:
For the BL2 collaboration
Neutron beta decay is the simplest example of semi-leptonic decay. A precise measurement of the neutron lifetime, as well as the coupling constant λ allows for a determination of the CKM matrix element Vud that is free from nuclear structure effects. The neutron lifetime provides an important test of unitarity and consistency of the Standard Model. The neutron lifetime is also the largest uncertainty in Big Bang Nucleosynthesis calculations of light element abundance. There is currently a large discrepancy between different experimental methods of measuring the neutron lifetime. A new measurement of the neutron lifetime using the in-beam method is ongoing at the NIST Center for Neutron Research. This method requires the absolute counting of the decay protons in a neutron beam of precisely known flux. Improvements in the neutron and proton detection systems as well as the use of a new analysis technique should permit an overall uncertainty of 1s. The experimental status, technical improvements, analysis techniques and early data will be presented.
*Supported by: DOE, NSF and NIST
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.SES.E03.1
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