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Published March 25, 2013 | Published + Submitted
Journal Article Open

Precision measurement of the neutron β-decay asymmetry

Abstract

A new measurement of the neutron β-decay asymmetry A_0 has been carried out by the UCNA Collaboration using polarized ultracold neutrons (UCNs) from the solid deuterium UCN source at the Los Alamos Neutron Science Center. Improvements in the experiment have led to reductions in both statistical and systematic uncertainties leading to A_0=−0.11954(55)_(stat)(98)_(syst), corresponding to the ratio of axial-vector to vector coupling λ ≡ g_A/g_V = −1.2756(30).

Additional Information

© 2013 American Physical Society. Received 13 December 2012; revised manuscript received 19 February 2013; published 25 March 2013. This work was supported in part by the US Department of Energy, Office of Nuclear Physics (DE-FG02-08ER41557), National Science Foundation (NSF-0855538, NSF-1205977, NSF-0653222), and the Los Alamos National Laboratory LDRD program. We gratefully acknowledge the support of LANSCE and AOT divisions of Los Alamos National Laboratory.

Attached Files

Published - PhysRevC.87.032501.pdf

Submitted - 1210.7048v3.pdf

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August 19, 2023
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