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

Plaster, B. and Adamek, E. and Allgeier, B. and Anaya, J. and Back, H. O. and Bagdasarova, Y. and Berguno, D. B. and Blatnik, M. and Boissevain, J. G. and Bowles, T. J. and Broussard, L. J. and Brown, M. A.-P. and Carr, R. and Clark, D. J. and Clayton, S. and Cude-Woods, C. and Currie, S. and Dees, E. B. and Ding, X. and Du, S. and Filippone, B. W. and García, A. and Geltenbort, P. and Hasan, S. and Hawari, A. and Hickerson, K. P. and Hill, R. and Hino, M. and Hoagland, J. and Hoedl, S. A. and Hogan, G. E. and Hona, B. and Hong, R. and Holley, A. T. and Ito, T. M. and Kawai, T. and Kirch, K. and Kitagaki, S. and Knecht, A. and Lamoreaux, S. K. and Liu, C.-Y. and Liu, J. and Makela, M. and Mammei, R. R. and Martin, J. W. and Meier, N. and Melconian, D. and Mendenhall, M. P. and Moore, S. D. and Morris, C. L. and Mortensen, R. and Nepal, S. and Nouri, N. and Pattie, R. W. and Pérez Galván, A. and Phillips II, D. G. and Pichlmaier, A. and Picker, R. and Pitt, M. L. and Ramsey, J. C. and Rios, R. and Russell, R. and Sabourov, K. and Sallaska, A. L. and Salvat, D. J. and Saunders, A. and Schmid, R. and Seestrom, S. J. and Servicky, C. and Sharapov, E. I. and Sjue, S. K. L. and Slutsky, S. and Smith, D. and Sondheim, W. E. and Sun, X. and Swank, C. and Swift, G. and Tatar, E. and Teasdale, W. and Terai, C. and Tipton, B. and Utsuro, M. and Vogelaar, R. B. and VornDick, B. and Wang, Z. and Wehring, B. and Wexler, J. and Womack, T. and Wrede, C. and Xu, Y. P. and Yan, H. and Young, A. R. and Yuan, J. and Zeck, B. A. (2019) Final results for the neutron β-asymmetry parameter A₀ from the UCNA experiment. EPJ Web of Conferences, 219 . Art. No. 04004. ISSN 2100-014X.

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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.

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Filippone, B. W.0000-0002-2618-2688
Hickerson, K. P.0000-0001-7647-119X
Additional Information:© 2019 The Authors, published by EDP Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Published online 12 December 2019. This work was supported in part by the U.S. Department of Energy, Office of Nuclear Physics (DE-FG02-08ER41557, DE-SC0014622, DE-FG02-97ER41042) and the National Science Foundation (NSF-0700491, NSF-1002814, NSF-1005233, NSF-1102511, NSF-1205977, NSF-1306997, NSF-1307426, NSF-1506459, and NSF-1615153). We gratefully acknowledge the support of the LDRD program (20110043DR), and the LANSCE and AOT divisions of the Los Alamos National Laboratory. We thank the organizers of the PPNS-2018 workshop for selecting this abstract for an oral presentation, and for their excellent hospitality during this outstanding decennial workshop.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-08ER41557
Department of Energy (DOE)DE-SC0014622
Department of Energy (DOE)DE-FG02-97ER41042
Los Alamos National Laboratory20110043DR
Record Number:CaltechAUTHORS:20200309-133907238
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Official Citation:Final results for the neutron β-asymmetry parameter A0 from the UCNA experiment. B. Plaster, E. Adamek, B. Allgeier, J. Anaya, H.O. Back, Y. Bagdasarova, D.B. Berguno, M. Blatnik, J.G. Boissevain, T.J. Bowles, L.J. Broussard, M.A.-P. Brown, R. Carr, D.J. Clark, S. Clayton, C. Cude-Woods, S. Currie, E.B. Dees, X. Ding, S. Du, B.W. Filippone, A. García, P. Geltenbort, S. Hasan, A. Hawari, K.P. Hickerson, R. Hill, M. Hino, J. Hoagland, S.A. Hoedl, G.E. Hogan, B. Hona, R. Hong, A.T. Holley, T.M. Ito, T. Kawai, K. Kirch, S. Kitagaki, A. Knecht, S.K. Lamoreaux, C.-Y. Liu, J. Liu, M. Makela, R.R. Mammei, J.W. Martin, N. Meier, D. Melconian, M.P. Mendenhall, S.D. Moore, C.L. Morris, R. Mortensen, S. Nepal, N. Nouri, R.W. Pattie, A. Pérez Galván, D.G. Phillips II, A. Pichlmaier, R. Picker, M.L. Pitt, J.C. Ramsey, R. Rios, R. Russell, K. Sabourov, A.L. Sallaska, D.J. Salvat, A. Saunders, R. Schmid, S.J. Seestrom, C. Servicky, E.I. Sharapov, S.K.L. Sjue, S. Slutsky, D. Smith, W.E. Sondheim, X. Sun, C. Swank, G. Swift, E. Tatar, W. Teasdale, C. Terai, B. Tipton, M. Utsuro, R.B. Vogelaar, B. VornDick, Z. Wang, B. Wehring, J. Wexler, T. Womack, C. Wrede, Y.P. Xu, H. Yan, A.R. Young, J. Yuan and B.A. Zeck. EPJ Web Conf., 219 (2019) 04004; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101790
Deposited By: Tony Diaz
Deposited On:09 Mar 2020 21:07
Last Modified:09 Mar 2020 21:07

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