Abstract

The UCNA experiment was designed to measure the neutron β-asymmetry parameter A0 using polarized ultracold neutrons (UCN). UCN produced via downscattering in solid deuterium were polarized via transport through a 7 T magnetic field, and then directed to a 1 T solenoidal electron spectrometer, where the decay electrons were detected in electron detector packages located on the two ends of the spectrometer. A value for A0 was then extracted from the asymmetry in the numbers of counts in the two detector packages. We summarize all of the results from the UCNA experiment, obtained during run periods in 2007, 2008–2009, 2010, and 2011–2013, which ultimately culminated in a 0.67% precision result for A0.

Details

Title
Final results for the neutron β-asymmetry parameter A0 from the UCNA experiment
Author
Plaster, B; Adamek, E; Allgeier, B; Anaya, J; Back, HO; Bagdasarova, Y; Berguno, D B; Blatnik, M; Boissevain, J G; Bowles, T J; Broussard, L J; MA-P Brown; Carr, R; Clark, D J; Clayton, S; Cude-Woods, C; Currie, S; Dees, E B; Ding, X; S Du; Filippone, B W; García, A; Geltenbort, P; Hasan, S; Hawari, A; Hickerson, K P; Hill, R; Hino, M; Hoagland, J; Hoedl, SA; Hogan, GE; Hona, B; Hong, R; Holley, A T; Ito, T M; Kawai, T; Kirch, K; Kitagaki, S; Knecht, A; Lamoreaux, S K; C-Y, Liu; Liu, J; Makela, M; Mammei, R R; Martin, J W; Meier, N; Melconian, D; Mendenhall, M P; Moore, S D; Morris, CL; Mortensen, R; Nepal, S; Nouri, N; Pattie, RW, Jr; A Pérez Galván; Phillips, DG, II; Pichlmaier, A; Picker, R; Pitt, M L; Ramsey, J C; Rios, R; Russell, R; Sabourov, K; Sallaska, AL; Salvat, D J; Saunders, A; Schmid, R; Seestrom, S J; Servicky, C; Sharapov, E I; Sjue, SKL; Slutsky, S; Smith, D; Sondheim, W E; Sun, X; Swank, C; Swift, G; Tatar, E; Teasdale, W; Terai, C; Tipton, B; Utsuro, M; Vogelaar, R B; VornDick, B; Wang, Z; Wehring, B; Wexler, J; Womack, T; Wrede, C; Xu, Y P; Yan, H; Young, A R; Yuan, J; Zeck, BA
Section
Studies of Neutron Beta Decay
Publication year
2019
Publication date
2019
Publisher
EDP Sciences
ISSN
21016275
e-ISSN
2100014X
Source type
Conference Paper
Language of publication
English
DOI
https://doi.org/10.1051/epjconf/201921904004
ProQuest document ID
2345554882
Copyright
© 2019. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and conditions, you may use this content in accordance with the terms of the License.