Enhanced ballistic phonon production for surface events in cryogenic silicon detector

Citation
Rm. Clarke et al., Enhanced ballistic phonon production for surface events in cryogenic silicon detector, APPL PHYS L, 76(20), 2000, pp. 2958-2960
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
76
Issue
20
Year of publication
2000
Pages
2958 - 2960
Database
ISI
SICI code
0003-6951(20000515)76:20<2958:EBPPFS>2.0.ZU;2-Z
Abstract
We present evidence of an enhanced ballistic phonon component resulting fro m surface events in a 100 g silicon cryogenic dark matter detector. Surface events, calibrated using a C-14 electron source, were found to have faster rise times (similar to 5 mu s) than bulk gamma and neutron events (similar to 7 mu s). Using this effect, we were able to discriminate bulk nuclear r ecoil events from a surface electron background at better than the 97% leve l above 25 keV recoil energy. The phonon risetime for bulk gamma events was dependent on the applied voltage, confirming that phonons produced from el ectron-hole emission are ballistic. (C) 2000 American Institute of Physics. [S0003-6951(00)05020-8].