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: C14.00002 : The BL2 Experiment: An In-Beam Measurement of the Neutron Lifetime*
2:06 PM–2:18 PM
View Presentation Abstract
Presenter:
Jimmy Caylor
(The University of Tennessee - Knoxville)
Author:
Jimmy Caylor
(The University of Tennessee - Knoxville)
Collaboration:
For the BL2 Collaboration
Neutron beta decay is the simplest example of semi-leptonic decay. A precise measurement of the neutron lifetime and λ, the ratio of axial vector and vector coupling constants of the weak interaction, allow 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. 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 beta 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.
*This work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract DE-FG02-03ER41258
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