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Characteristics of Signals Originating Near the Lithium-Diffused N+ Contact of High Purity Germanium P-Type Point Contact Detectors

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arxiv 1207.6716 v1 pith:BMRHF34U submitted 2012-07-28 physics.ins-det hep-exnucl-ex

Characteristics of Signals Originating Near the Lithium-Diffused N+ Contact of High Purity Germanium P-Type Point Contact Detectors

The MAJORANA Collaboration: E. Aguayo , M. Amman , F. T. Avignone III , A. S. Barabash , P. J. Barton , J. R. Beene , F. E. Bertrand , M. Boswell
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V. Brudanin M. Busch Y-D. Chan C. D. Christofferson J. I. Collar D. C. Combs R. J. Cooper J. A. Detwiler P. J. Doe Yu. Efremenko V. Egorov H. Ejiri S. R. Elliott J. Esterline J. E. Fast N. Fields P. Finnerty F. M. Fraenkle A. Galindo-Uribarri V. M. Gehman G. K. Giovanetti M. P. Green V. E. Guiseppe K. Gusey A. L. Hallin R. Hazama R. Henning E. W. Hoppe M. Horton S. Howard M. A. Howe R. A. Johnson K. J. Keeter M. F. Kidd A. Knecht O. Kochetov S. I. Konovalov R. T. Kouzes B. D. LaFerriere J. Leon L. E. Leviner J. C. Loach Q. Looker P. N. Luke S. MacMullin M. G. Marino R. D. Martin J. H. Merriman M. L. Miller L. Mizouni M. Nomachi J. L. Orrell N. R. Overman G. Perumpilly D. G. Phillips II A. W. P. Poon D. C. Radford K. Rielage R. G. H. Robertson M. C. Ronquest A. G. Schubert T. Shima M. Shirchenko K. J. Snavely D. Steele J. Strain V. Timkin W. Tornow R. L. Varner K. Vetter K. Vorren J. F. Wilkerson E. Yakushev H. Yaver A. R. Young C.-H. Yu V. Yumatov
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classification physics.ins-det hep-exnucl-ex
keywords contactenergygermaniumdetectorshighlithium-diffusednearoriginating
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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