Measurement of the neutrino asymmetry in the beta decay of laser-cooled, polarized K-37
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A measurement of the neutrino asymmetry is presented which represents the first search for new physics using polarized radioactive atoms initially cooled and confined in a magneto-optical trap. Optical pumping and photoionization techniques are used to generate and measure, in situ, a highly spin-polarized (96.5 (0.8) %) sample of the short-lived +-emitter 37K. The angular distribution of neutrinos from this polarized decay, inferred from the daughter recoil asymmetry, is used to search for a hypothetical V + A current in the weak interaction. We find the asymmetry parameter to be B = - 0.755 0.020 (stat) 0.013 (syst), in agreement with the standard model's purely V - A interaction. 2007 Elsevier B.V. All rights reserved.
author list (cited authors)
Melconian, D., Behr, J. A., Ashery, D., Aviv, O., Bricault, P. G., Dombsky, M., ... Vollrath, I.
complete list of authors
Melconian, D||Behr, JA||Ashery, D||Aviv, O||Bricault, PG||Dombsky, M||Fostner, S||Gorelov, A||Gu, S||Hanemaayer, V||Jackson, KP||Pearson, MR||Vollrath, I