Final results for the neutron β-asymmetry parameter A0 from the UCNA experiment

/ Authors

B. Plaster, E. Adamek, B. Allgeier, Jose María Anaya, H. Back, Y. Bagdasarova, D. B. Berguño, Matej Blatnik, J. Boissevain, T. Bowles

and 84 more authors

L. Broussard, M. A. Brown, R. Carr, D. J. Clark, S. Clayton, C. Cude-Woods, S. Currie, E. Dees, X. Ding, S. Du, B. Filippone, A. García, P. Geltenbort, S. Hasan, A. Hawari, K. Hickerson, R. Hill, M. Hino, J. Hoagland, S. Hoedl, G. Hogan, B. Hona, R. Hong, A. Holley, T. Ito, T. Kawai, K. Kirch, S. Kitagaki, A. Knecht, S. Lamoreaux, C-Y. Liu, J. Liu, M. Makela, R. Mammei, J. Martin, N. Meier, D. Melconian, M. Mendenhall, S. Moore, C. Morris, R. Mortensen, S. Nepal, N. Nouri, R. Pattie, A. P. Galvan, D. Phillips, A. Pichlmaier, R. Picker, M. Pitt, J. Ramsey, R. Rios, R. Russell, K. Sabourov, A. Sallaska, D. Salvat, A. Saunders, R. Schmid, S. Seestrom, C. Servicky, E. Sharapov, S. Sjue, S. Slutsky, D. Smith, W. Sondheim, X. Sun, C. Swank, G. Swift, E. Tatar, W. Teasdale, C. Terai, B. Tipton, M. Utsuro, R. Vogelaar, B. Vorndick, Z. Wang, B. Wehring, J. Wexler, T. Womack, C. Wrede, Y. Xu, H. Yan, A. R. Young, J. Yuan, B. Zeck

/ 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.

Journal: EPJ Web of Conferences

DOI: 10.1051/epjconf/201921904004

Final results for the neutron β-asymmetry parameter A0 from the UCNA experiment

/ Authors

B. Plaster, E. Adamek, B. Allgeier, Jose María Anaya, H. Back, Y. Bagdasarova, D. B. Berguño, Matej Blatnik, J. Boissevain, T. Bowles

and 84 more authors

/ Abstract

Journal: EPJ Web of Conferences

DOI: 10.1051/epjconf/201921904004