Final results for the neutron $\beta$-asymmetry parameter $A_0$ from the UCNA experiment
Abstract
The UCNA experiment was designed to measure the neutron -asymmetry parameter 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 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 .
Keywords
Cite
@article{arxiv.1904.05432,
title = {Final results for the neutron $\beta$-asymmetry parameter $A_0$ from the UCNA experiment},
author = {B. Plaster and E. Adamek and B. Allgeier and J. Anaya and H. O. Back and Y. Bagdasarova and D. B. Berguno and M. Blatnik and J. G. Boissevain and T. J. Bowles and L. J. Broussard and M. A. -P. Brown and R. Carr and D. J. Clark and S. Clayton and C. Cude-Woods and S. Currie and E. B. Dees and X. Ding and S. Du and B. W. Filippone and A. Garcia and P. Geltenbort and S. Hasan and A. Hawari and K. P. Hickerson and R. Hill and M. Hino and J. Hoagland and S. A. Hoedl and G. E. Hogan and B. Hona and R. Hong and A. T. Holley and T. M. Ito and T. Kawai and K. Kirch and S. Kitagaki and A. Knecht and S. K. Lamoreaux and C. -Y. Liu and J. Liu and M. Makela and R. R. Mammei and J. W. Martin and N. Meier and D. Melconian and M. P. Mendenhall and S. D. Moore and C. L. Morris and R. Mortensen and S. Nepal and N. Nouri and R. W. Pattie and A. Perez Galvan and D. G. Phillips and A. Pichlmaier and R. Picker and M. L. Pitt and J. C. Ramsey and R. Rios and R. Russell and K. Sabourov and A. L. Sallaska and D. J. Salvat and A. Saunders and R. Schmid and S. J. Seestrom and C. Servicky and E. I. Sharapov and S. K. L. Sjue and S. Slutsky and D. Smith and W. E. Sondheim and X. Sun and C. Swank and G. Swift and E. Tatar and W. Teasdale and C. Terai and B. Tipton and M. Utsuro and R. B. Vogelaar and B. VornDick and Z. Wang and B. Wehring and J. Wexler and T. Womack and C. Wrede and Y. P. Xu and H. Yan and A. R. Young and J. Yuan and B. A. Zeck},
journal= {arXiv preprint arXiv:1904.05432},
year = {2020}
}
Comments
6 pages, 7 figures, to appear in proceedings of the International Workshop on Particle Physics at Neutron Sources 2018