Improved limits on Fierz interference using asymmetry measurements from the Ultracold Neutron Asymmetry (UCNA) experiment
| Pub type: | Article |
| Citation: | PhysRevC.101.035503 |
| Status: | Published |
| Journal: | Phys. Rev. C |
| Volume: | 101 |
| Number: | 3 |
| Year: | 2020 |
| Month: | Mar |
| Pages: | 035503 |
| Publisher: | American Physical Society |
| URL: | https://link.aps.org/doi/10.11... |
| DOI: | 10.1103/physrevc.101.035503 |
| Abstract: | The Ultracold Neutron Asymmetry (UCNA) experiment was designed to measure the β-decay asymmetry parameter, A_0, for free neutron decay. In the experiment, polarized ultracold neutrons are transported into a decay trap, and their β-decay electrons are detected with ≈4π acceptance into two detector packages which provide position and energy reconstruction. The experiment also has sensitivity to b_n, the Fierz interference term in the neutron β-decay rate. In this work, we determine b_n from the energy dependence of A_0 using the data taken during the UCNA 2011–2013 run. In addition, we present the same type of analysis using the earlier 2010 A dataset. Motivated by improved statistics and comparable systematic errors compared to the 2010 data-taking run, we present a new b_n measurement using the weighted average of our asymmetry dataset fits, to obtain b_n=0.066±0.041stat±0.024syst which corresponds to a limit of −0.012 |
| Month_val: | 3 |
| Collaborator(s): | García, A. (University of Washington, Center for Experimental Nuclear Physics and Astrophysics), Young, A. R. (North Carolina State University) |
| Authors: | |
| Added by: | [DGM] |
| Total mark: | 0 |
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