Nab: Measurement principles, apparatus and uncertainties

Authors :: Počanić, Dinko
Alarcon, R.
Alonzi, L.P.
Baeßler, S.
Balascuta, S.
Bowman, J.D.
Bychkov, M.A.
Byrne, J.
Calarco, J.R.
Cianciolo, V.
Crawford, C.
Frlež, E.
Gericke, M.T.
Greene, G.L.
Grzywacz, R.K.
Gudkov, V.
Hersman, F.W.
Klein, A.
Martin, J.
Page, S.A.
Source :: Nuclear Instruments & Methods in Physics Research Section A. Dec2009, Vol. 611 Issue 2/3, p211-215. 5p.
Publication Year :: 2009
Abstract: Abstract: The Nab collaboration will perform a precise measurement of a, the electron–neutrino correlation parameter, and b, the Fierz interference term in neutron beta decay, in the Fundamental Neutron Physics Beamline at the SNS, using a novel electric/magnetic field spectrometer and detector design. The experiment is aiming at the accuracy level in , and will provide an independent measurement of , the ratio of axial-vector to vector coupling constants of the nucleon. Nab also plans to perform the first ever measurement of b in neutron decay, which will provide an independent limit on the tensor weak coupling. [Copyright &y& Elsevier]