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Surface Characterization of P-Type Point Contact Germanium Detectors
- Source :
- Particles, Vol 4, Iss 36, Pp 489-511 (2021), Particles, Volume 4, Issue 4, Pages 36-511
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- P-type point contact (PPC) germanium detectors are used in rare event and low-background searches, including neutrinoless double beta (0νββ) decay, low-energy nuclear recoils, and coherent elastic neutrino-nucleus scattering. The detectors feature an excellent energy resolution, low detection thresholds down to the sub-keV range, and enhanced background rejection capabilities. However, due to their large passivated surface, separating the signal readout contact from the bias voltage electrode, PPC detectors are susceptible to surface effects such as charge build-up. A profound understanding of their response to surface events is essential. In this work, the response of a PPC detector to alpha and beta particles hitting the passivated surface was investigated in a multi-purpose scanning test stand. It is shown that the passivated surface can accumulate charges resulting in a radial-dependent degradation of the observed event energy. In addition, it is demonstrated that the pulse shapes of surface alpha events show characteristic features which can be used to discriminate against these events.
- Subjects :
- Materials science
Physics - Instrumentation and Detectors
Physics::Instrumentation and Detectors
P-type point contact germanium detectors
FOS: Physical sciences
chemistry.chemical_element
Germanium
QC770-798
01 natural sciences
alpha and beta surface backgrounds
neutrinoless double beta decay
High Energy Physics - Experiment
High Energy Physics - Experiment (hep-ex)
Double beta decay
Nuclear and particle physics. Atomic energy. Radioactivity
0103 physical sciences
Beta particle
010306 general physics
Range (particle radiation)
010308 nuclear & particles physics
business.industry
Scattering
Detector
Biasing
Instrumentation and Detectors (physics.ins-det)
chemistry
Electrode
Optoelectronics
business
Subjects
Details
- Language :
- English
- Volume :
- 4
- Issue :
- 36
- Database :
- OpenAIRE
- Journal :
- Particles
- Accession number :
- edsair.doi.dedup.....c2f43023491cfa129e22b659274b5230