Search for Pauli Exclusion Principle Violating Atomic Transitions and   Electron Decay with a P-type Point Contact Germanium Detector
  A search for Pauli-exclusion-principle-violating K-alpha electron transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8x10^30 seconds at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the x-ray and Auger electrons present following the transition. A similar analysis was done to look for the decay of atomic K-shell electrons into neutrinos, resulting in a lower limit of 6.8x10^30 seconds at 90 C.L. It is estimated that the MAJORANA DEMONSTRATOR, a 44 kg array of p-type point contact detectors that will search for the neutrinoless double-beta decay of 76-Ge, could improve upon these exclusion limits by an order of magnitude after three years of operation. 
N. Abgrall, I.J. Arnquist, F.T. Avignone III, A.S. Barabash, F.E.   Bertrand, A.W. Bradley, V. Brudanin, M. Busch, M. Buuck,...
nucl-ex physics.ins-det