Progress towards precision measurements of beta-decay correlation   parameters using atom and ion traps
  The correlations of the decay products following the beta decay of nuclei have a long history of providing a low-energy probe of the fundamental symmetries of our universe. Over half a century ago, the correlation of the electrons following the decay of polarized 60Co demonstrated that parity is not conserved in weak interactions. Today, the same basic idea continues to be applied to search for physics beyond the standard model: make precision measurements of correlation parameters and look for deviations compared to their standard model predictions. Efforts to measure these parameters to the 0.1% level utilizing atom and ion trapping techniques are described. 
D. Melconian, R.S. Behling, B. Fenker, M. Mehlman, P.D. Shidling, M.   Anholm, D. Ashery, J.A. Behr, A. Gorelov, G. Gwinner,...
physics.ins-det nucl-ex