Enhanced ballistic phonon production for surface events in cryogenic silicon detector

Journal Article · Mon May 15 00:00:00 EDT 2000 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.126529· OSTI ID:20216364

Clarke, R M ^[1]; Brink, P L ^[1]; Cabrera, B ^[1]; Colling, P ^[1]; Crisler, M B ^[1]; Davies, A K ^[1]; Eichblatt, S ^[1]; Gaitskell, R J ^[1]; Hellmig, J ^[1]; Martinis, J M ^[1]

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1. Physics Department, Stanford University, Stanford, California 94305 (United States)

We present evidence of an enhanced ballistic phonon component resulting from surface events in a 100 g silicon cryogenic dark matter detector. Surface events, calibrated using a {sup 14}C electron source, were found to have faster rise times ({approx}5 {mu}s) than bulk gamma and neutron events ({approx}7 {mu}s). Using this effect, we were able to discriminate bulk nuclear recoil events from a surface electron background at better than the 97% level above 25 keV recoil energy. The phonon risetime for bulk gamma events was dependent on the applied voltage, confirming that phonons produced from electron-hole emission are ballistic. (c) 2000 American Institute of Physics.

• OSTI ID: 20216364
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 20 Vol. 76; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ASTROPHYSICS
CALIBRATION
CARBON 14
CRYOGENICS
EXPERIMENTAL DATA
GAMMA RADIATION
IONIZATION
NEUTRONS
PHONONS
RADIATION DETECTORS
RECOILS
SURFACE PROPERTIES