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Comparison of CDMS [100] and [111] Oriented Germanium Detectors
The Cryogenic Dark Matter Search (CDMS) utilizes large mass, 3″ diameter × 1″ thick target masses as particle detectors. The target is instrumented with both phonon and ionization sensors and comparison of energy in each channel provides event-by-event classification of electron and nuclear recoils....
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Published in: | Journal of low temperature physics 2012-06, Vol.167 (5-6), p.1106-1111 |
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Main Authors: | , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The Cryogenic Dark Matter Search (CDMS) utilizes large mass, 3″ diameter × 1″ thick target masses as particle detectors. The target is instrumented with both phonon and ionization sensors and comparison of energy in each channel provides event-by-event classification of electron and nuclear recoils. Fiducial volume is determined by the ability to obtain good phonon and ionization signal at a particular location. Due to electronic band structure in germanium, electron mass is described by an anisotropic tensor with heavy mass aligned along the symmetry axis defined by the [111] Miller index (L valley), resulting in large lateral component to the transport. The spatial distribution of electrons varies significantly for detectors which have their longitudinal axis orientations described by either the [100] or [111] Miller indices. Electric fields with large fringing component at high detector radius also affect the spatial distribution of electrons and holes. Both effects are studied in a 3 dimensional Monte Carlo and the impact on fiducial volume is discussed. |
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ISSN: | 0022-2291 1573-7357 |
DOI: | 10.1007/s10909-011-0427-0 |