Improved limits on Fierz interference using asymmetry measurements from the Ultracold Neutron Asymmetry (UCNA) experiment

doi:10.1103/PhysRevC.101.035503

Improved limits on Fierz interference using asymmetry measurements from the Ultracold Neutron Asymmetry (UCNA) experiment

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23 Citas (Scopus)

Resumen

The Ultracold Neutron Asymmetry (UCNA) experiment was designed to measure the β-decay asymmetry parameter, A0, for free neutron decay. In the experiment, polarized ultracold neutrons are transported into a decay trap, and their β-decay electrons are detected with ≈4π acceptance into two detector packages which provide position and energy reconstruction. The experiment also has sensitivity to bn, the Fierz interference term in the neutron β-decay rate. In this work, we determine bn from the energy dependence of A0 using the data taken during the UCNA 2011-2013 run. In addition, we present the same type of analysis using the earlier 2010 A dataset. Motivated by improved statistics and comparable systematic errors compared to the 2010 data-taking run, we present a new bn measurement using the weighted average of our asymmetry dataset fits, to obtain bn=0.066±0.041stat±0.024syst which corresponds to a limit of -0.012<bn<0.144 at the 90% confidence level.

Idioma original	English
Número de artículo	035503
Publicación	Physical Review C
Volumen	101
N.º	3
DOI	https://doi.org/10.1103/PhysRevC.101.035503
Estado	Published - mar 2020

Nota bibliográfica

Publisher Copyright:
© 2020 American Physical Society.

Financiación

This work is 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 (1002814, 1005233, 1205977, 1306997, 1307426, 1506459, 1615153, 1812340, and 1914133). Furthermore, we gratefully acknowledge the support of the LDRD program (20110043DR), and the help of those at the Accelerator Operations and Technology division at Los Alamos National Laboratory.

Financiadores	Número del financiador
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	1506459, 1205977, 1615153, 1914133, 1005233, 1306997, 1307426, 1812340, 1002814
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China
U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing Center
Horia Hulubei National Institute for Physics and Nuclear Engineering	DE-FG02-08ER41557, DE-FG02-97ER41042, DE-SC0014622
Horia Hulubei National Institute for Physics and Nuclear Engineering
Laboratory Directed Research and Development	20110043DR
Laboratory Directed Research and Development
Los Alamos National Laboratory

ASJC Scopus subject areas

Nuclear and High Energy Physics

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title = "Improved limits on Fierz interference using asymmetry measurements from the Ultracold Neutron Asymmetry (UCNA) experiment",

abstract = "The Ultracold Neutron Asymmetry (UCNA) experiment was designed to measure the β-decay asymmetry parameter, A0, for free neutron decay. In the experiment, polarized ultracold neutrons are transported into a decay trap, and their β-decay electrons are detected with ≈4π acceptance into two detector packages which provide position and energy reconstruction. The experiment also has sensitivity to bn, the Fierz interference term in the neutron β-decay rate. In this work, we determine bn from the energy dependence of A0 using the data taken during the UCNA 2011-2013 run. In addition, we present the same type of analysis using the earlier 2010 A dataset. Motivated by improved statistics and comparable systematic errors compared to the 2010 data-taking run, we present a new bn measurement using the weighted average of our asymmetry dataset fits, to obtain bn=0.066±0.041stat±0.024syst which corresponds to a limit of -0.012",

author = "X. Sun and E. Adamek and B. Allgeier and Y. Bagdasarova and Berguno, \{D. B.\} and M. Blatnik and Bowles, \{T. J.\} and Broussard, \{L. J.\} and Brown, \{M. A.P.\} and R. Carr and S. Clayton and C. Cude-Woods and S. Currie and Dees, \{E. B.\} and X. Ding and Filippone, \{B. W.\} and A. Garc{\'i}a and P. Geltenbort and S. Hasan and Hickerson, \{K. P.\} and J. Hoagland and R. Hong and Holley, \{A. T.\} and Ito, \{T. M.\} and A. Knecht and Liu, \{C. Y.\} and J. Liu and M. Makela and R. Mammei and Martin, \{J. W.\} and D. Melconian and Mendenhall, \{M. P.\} and Moore, \{S. D.\} and Morris, \{C. L.\} and S. Nepal and N. Nouri and Pattie, \{R. W.\} and \{P{\'e}rez G{\'a}lvan\}, A. and Phillips, \{D. G.\} and R. Picker and Pitt, \{M. L.\} and B. Plaster and Salvat, \{D. J.\} and A. Saunders and Sharapov, \{E. I.\} and S. Sjue and S. Slutsky and W. Sondheim and C. Swank and E. Tatar",

note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = mar,

doi = "10.1103/PhysRevC.101.035503",

language = "English",

volume = "101",

number = "3",

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T1 - Improved limits on Fierz interference using asymmetry measurements from the Ultracold Neutron Asymmetry (UCNA) experiment

AU - Sun, X.

AU - Adamek, E.

AU - Allgeier, B.

AU - Bagdasarova, Y.

AU - Berguno, D. B.

AU - Blatnik, M.

AU - Bowles, T. J.

AU - Broussard, L. J.

AU - Brown, M. A.P.

AU - Carr, R.

AU - Clayton, S.

AU - Cude-Woods, C.

AU - Currie, S.

AU - Dees, E. B.

AU - Ding, X.

AU - Filippone, B. W.

AU - García, A.

AU - Geltenbort, P.

AU - Hasan, S.

AU - Hickerson, K. P.

AU - Hoagland, J.

AU - Hong, R.

AU - Holley, A. T.

AU - Ito, T. M.

AU - Knecht, A.

AU - Liu, C. Y.

AU - Liu, J.

AU - Makela, M.

AU - Mammei, R.

AU - Martin, J. W.

AU - Melconian, D.

AU - Mendenhall, M. P.

AU - Moore, S. D.

AU - Morris, C. L.

AU - Nepal, S.

AU - Nouri, N.

AU - Pattie, R. W.

AU - Pérez Gálvan, A.

AU - Phillips, D. G.

AU - Picker, R.

AU - Pitt, M. L.

AU - Plaster, B.

AU - Salvat, D. J.

AU - Saunders, A.

AU - Sharapov, E. I.

AU - Sjue, S.

AU - Slutsky, S.

AU - Sondheim, W.

AU - Swank, C.

AU - Tatar, E.

PY - 2020/3

Y1 - 2020/3

N2 - The Ultracold Neutron Asymmetry (UCNA) experiment was designed to measure the β-decay asymmetry parameter, A0, for free neutron decay. In the experiment, polarized ultracold neutrons are transported into a decay trap, and their β-decay electrons are detected with ≈4π acceptance into two detector packages which provide position and energy reconstruction. The experiment also has sensitivity to bn, the Fierz interference term in the neutron β-decay rate. In this work, we determine bn from the energy dependence of A0 using the data taken during the UCNA 2011-2013 run. In addition, we present the same type of analysis using the earlier 2010 A dataset. Motivated by improved statistics and comparable systematic errors compared to the 2010 data-taking run, we present a new bn measurement using the weighted average of our asymmetry dataset fits, to obtain bn=0.066±0.041stat±0.024syst which corresponds to a limit of -0.012

AB - The Ultracold Neutron Asymmetry (UCNA) experiment was designed to measure the β-decay asymmetry parameter, A0, for free neutron decay. In the experiment, polarized ultracold neutrons are transported into a decay trap, and their β-decay electrons are detected with ≈4π acceptance into two detector packages which provide position and energy reconstruction. The experiment also has sensitivity to bn, the Fierz interference term in the neutron β-decay rate. In this work, we determine bn from the energy dependence of A0 using the data taken during the UCNA 2011-2013 run. In addition, we present the same type of analysis using the earlier 2010 A dataset. Motivated by improved statistics and comparable systematic errors compared to the 2010 data-taking run, we present a new bn measurement using the weighted average of our asymmetry dataset fits, to obtain bn=0.066±0.041stat±0.024syst which corresponds to a limit of -0.012

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DO - 10.1103/PhysRevC.101.035503

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VL - 101

JO - Physical Review C

JF - Physical Review C

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ER -

Improved limits on Fierz interference using asymmetry measurements from the Ultracold Neutron Asymmetry (UCNA) experiment

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