Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session H14: Mini-Symposium:The Neutron Lifetime Anomaly - possible explanations
10:45 AM–12:21 PM,
Sunday, April 14, 2019
Sheraton
Room: Plaza Court 3
Sponsoring
Unit:
DNP
Chair: Chris Wrede, Michigan State University
Abstract: H14.00005 : Ultra-Cold Neutron measurement of Proton branching ratio in neutron Beta decay (UCNProBe)*
11:57 AM–12:09 PM
View Presentation Abstract
Presenter:
Zhaowen Tang
(Los Alamos National Laboratory)
Authors:
Zhaowen Tang
(Los Alamos National Laboratory)
Chris Cude-Woods
(Los Alamos National Laboratory)
Steven Clayton
(Los Alamos National Laboratory)
Christopher Lee Morris
(Los Alamos National Laboratory)
Takeyasu M Ito
(Los Alamos National Laboratory)
Mark F Makela
(Los Alamos National Laboratory)
Alexander Saunders
(Los Alamos National Laboratory)
Jin Ha Choi
(North Carolina State University)
Jared Lambert
(Utah State University)
Chen-Yu Liu
(Indiana University Bloomington)
Albert Young
(North Carolina State University)
Deion Fellers
(University of Colorado, Boulder)
Kevin P Hickerson
(Caltech)
Erik Watkins
(Los Alamos National Laboratory)
Robert W Pattie
(East Tennessee State University)
Bryan A Zeck
(North Carolina State University)
Christopher Martin O'Shaughnessy
(Los Alamos National Laboratory)
The free neutron lifetime can be measured using one of two methods: measuring the decay products of neutrons in a well calibrated neutron beam (beam experiment), or counting the number of surviving neutrons stored in a UCN trap over time (bottle experiment). The lifetime results from the two different methods differ by 10 seconds or five standard deviations. Our goal is to resolve the difference between the two measurements by measuring the proton branching ratio of neutron decay using UCNs. Detecting a proton branching ratio of less than one will indicate new physics beyond the Standard Model of particle physics. The experiment is realized by storing the neutrons in a material trap made from deuterated scintillators. To measure the beta decay lifetime, we will attempt to measure the absolute number of UCNs inside the trap and the absolute number of electrons from beta decay to 0.1% precision. In this talk, we will describe the concept of the experiment and its systematic error. We will also report recent characterization measurements performed on the scintillator.
*LANL LDRD DOE SULI
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