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Published November 12, 2012 | Published
Journal Article Open

Measurement of the neutron β-asymmetry parameter A_0 with ultracold neutrons

Abstract

We present a detailed report of a measurement of the neutron β-asymmetry parameter A_0, the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2×2π solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A_0=−0.11966±0.00089_(−0.00140)^(+0.00123), from which we extract a value for the ratio of the weak axial-vector and vector coupling constants of the nucleon, λ=g_A/g_V=−1.27590±0.00239_(−0.00377)^(+0.00331). Complete details of the analysis are presented.

Additional Information

© 2012 American Physical Society. Received 25 July 2012; published 12 November 2012. This work was supported in part by the Department of Energy Office of Nuclear Physics (Grant No. DE-FG02-08ER41557), the National Science Foundation (Grants No. NSF-0555674, No. NSF-0855538, No. NSF-0653222, and No. NSF-1005233), and the Los Alamos National Laboratory LDRD program. We gratefully acknowledge the support of the LANSCE and AOT divisions of Los Alamos National Laboratory.

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Published - PhysRevC.86.055501.pdf

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August 19, 2023
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