Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 701, Issue -, Pages 176-185Publisher
ELSEVIER
DOI: 10.1016/j.nima.2012.11.004
Keywords
Germanium detectors; Dead layer; Transition layer
Categories
Funding
- Direct For Mathematical & Physical Scien
- Division Of Physics [855314, 0903335] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1003399, 1102292, 1125897, 1202950, 1206314] Funding Source: National Science Foundation
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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. Published by Elsevier B.V.
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