Characteristics of Signals Originating Near the Lithium-Diffused N+   Contact of High Purity Germanium P-Type Point Contact Detectors
  A study of signals originating near the lithium-diffused n+ contact of p-type point contact (PPC) high purity germanium detectors (HPGe) is presented. The transition region between the active germanium and the fully dead layer of the n+ contact is examined. Energy depositions in this transition region are shown to result in partial charge collection. This provides a mechanism for events with a well defined energy to contribute to the continuum of the energy spectrum at lower energies. A novel technique to quantify the contribution from this source of background is introduced. Experiments that operate germanium detectors with a very low energy threshold may benefit from the methods presented herein. 
The MAJORANA Collaboration: E. Aguayo, M. Amman, F. T. Avignone III,   A. S. Barabash, P. J. Barton, J. R. Beene, F. E. Bert...
physics.ins-det hep-ex nucl-ex