Status of the NPDGamma experiment.

Authors :: Fry, J.
Alarcon, R.
Allen, R.
Askanazi, E.
Balascuta, S.
Barron-Palos, L.
Baeßler, S.
Barzilov, A.
Blessinger, C.
Blyth, D.
Bowman, J.
Calarco, J.
Chupp, T.
Coppola, C.
Crawford, C.
Craycraft, K.
Dabaghyan, M.
Evans, D.
Favela, J.
Fieseler, C.
Source :: Hyperfine Interactions; 12/27/2016, Vol. 238 Issue 1, p1-8, 8p
Publication Year :: 2016
Abstract: The NPDGamma experiment measures the parity-violating (PV) gamma asymmetry from polarized cold neutrons captured on protons at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). The (PV) neutron spin asymmetry A of photons from polarized cold neutron capture on protons is proportional to the Δ I=1 long range weak meson coupling $h_{\pi }^{1}$ between nucleons in the hadronic weak interaction (HWI). Liquid para-hydrogen production data taking concluded in April 2014 and once the background aluminum asymmetry measurements are complete, the PV asymmetry A can be extracted. Preliminary results of the analysis of A are presented. [ABSTRACT FROM AUTHOR]