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Title: Enhanced ballistic phonon production for surface events in cryogenic silicon detector

Abstract

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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Physics Department, Stanford University, Stanford, California 94305 (United States)
  2. Physics Department, Stanford University, Stanford, California 94305 (United States) (and others)
Publication Date:
OSTI Identifier:
20216364
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 76; Journal Issue: 20; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; RADIATION DETECTORS; CRYOGENICS; ASTROPHYSICS; PHONONS; SURFACE PROPERTIES; GAMMA RADIATION; NEUTRONS; RECOILS; IONIZATION; CALIBRATION; CARBON 14; EXPERIMENTAL DATA

Citation Formats

Clarke, R. M., Brink, P. L., Cabrera, B., Colling, P., Crisler, M. B., Davies, A. K., Eichblatt, S., Gaitskell, R. J., Hellmig, J., and Martinis, J. M. Enhanced ballistic phonon production for surface events in cryogenic silicon detector. United States: N. p., 2000. Web. doi:10.1063/1.126529.
Clarke, R. M., Brink, P. L., Cabrera, B., Colling, P., Crisler, M. B., Davies, A. K., Eichblatt, S., Gaitskell, R. J., Hellmig, J., & Martinis, J. M. Enhanced ballistic phonon production for surface events in cryogenic silicon detector. United States. doi:10.1063/1.126529.
Clarke, R. M., Brink, P. L., Cabrera, B., Colling, P., Crisler, M. B., Davies, A. K., Eichblatt, S., Gaitskell, R. J., Hellmig, J., and Martinis, J. M. Mon . "Enhanced ballistic phonon production for surface events in cryogenic silicon detector". United States. doi:10.1063/1.126529.
@article{osti_20216364,
title = {Enhanced ballistic phonon production for surface events in cryogenic silicon detector},
author = {Clarke, R. M. and Brink, P. L. and Cabrera, B. and Colling, P. and Crisler, M. B. and Davies, A. K. and Eichblatt, S. and Gaitskell, R. J. and Hellmig, J. and Martinis, J. M.},
abstractNote = {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.},
doi = {10.1063/1.126529},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 20,
volume = 76,
place = {United States},
year = {2000},
month = {5}
}