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

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arxiv 1904.05432 v1 pith:T6M7WW2Z submitted 2019-04-10 nucl-ex physics.ins-det

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
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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. Garcia 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. Perez Galvan D.G. Phillips 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 B.A. Zeck
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The UCNA experiment was designed to measure the neutron $\beta$-asymmetry parameter $A_0$ 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 $A_0$ 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 $A_0$.

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  1. Ultracold Neutron Guide-Coating Facility at U.Winnipeg

    physics.ins-det 2025-10 accept novelty 5.0

    A new PLD facility has been built and tested to apply DLC coatings on cylindrical UCN guides, achieving XRR-measured densities of 2.3-2.8 g/cm³ corresponding to optical potentials of 200-240 neV.