Measurement of radioactive contamination in the high-resistivity silicon CCDs of the DAMIC experiment - INSPIRE

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Measurement of radioactive contamination in the high-resistivity silicon CCDs of the DAMIC experiment

DAMIC

Collaboration

•

A. Aguilar-Arevalo
(
- Mexico U., ICN
)

Jun 8, 2015

19 pages

Published in:

JINST 10 (2015) 08, P08014

Published: Aug 25, 2015

e-Print:

1506.02562 [astro-ph.IM]

DOI:

10.1088/1748-0221/10/08/P08014

Report number:

FERMILAB-PUB-15-315-A-CD-E

Experiments:

FNAL-T-0987,
FNAL-E-0987

View in:

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Abstract: (IOP)

We present measurements of radioactive contamination in the high-resistivity silicon charge-coupled devices (CCDs) used by the DAMIC experiment to search for dark matter particles. Novel analysis methods, which exploit the unique spatial resolution of CCDs, were developed to identify α and β particles. Uranium and thorium contamination in the CCD bulk was measured through α spectroscopy, with an upper limit on the (238)U ((232)Th) decay rate of 5 (15) kg(−)(1) d(−)(1) at 95% CL. We also searched for pairs of spatially correlated electron tracks separated in time by up to tens of days, as expected from (32)Si –(32)P or (210)Pb –(210)Bi sequences of β decays. The decay rate of (32)Si was found to be 80(+110)(−)(65) kg(−)(1) d(−)(1) (95% CI). An upper limit of ~35 kg(−)(1) d(−)(1) (95% CL) on the (210)Pb decay rate was obtained independently by α spectroscopy and the β decay sequence search. These levels of radioactive contamination are sufficiently low for the successful operation of CCDs in the forthcoming 100 g DAMIC detector.

Note:

18 pages, 20 figures

Search for radioactive and fissile materials
Solid state detectors
Very low-energy charged particle detectors
Dark Matter detectors (WIMPs, axions, etc.)
electron: tracks
CCD
background: radioactivity
spatial resolution
dark matter: detector
uranium: nuclide

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