Measurement of radioactive contamination in the CCD’s of the DAMIC experiment - INSPIRE

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Measurement of radioactive contamination in the CCD’s of the DAMIC experiment

A. Aguilar-Arevalo
(
- Mexico U.
)
,
D. Amidei
(
- Michigan U.
)
,
X. Bertou
(
- Centro Atomico Bariloche
)
,
D. Bole
(
- Michigan U.
)
,
M. Butner
(
- Fermilab and
- Northern Illinois U.
)

Jun 9, 2016

5 pages

Part of Proceedings, 14th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2015) : Torino, Italy, September 7-11, 2015

Published in:

J.Phys.Conf.Ser. 718 (2016) 4, 042057

Contribution to:

- TAUP 2015

Published: Jun 9, 2016

DOI:

10.1088/1742-6596/718/4/042057

Experiments:

DAMIC

View in:

ADS Abstract Service

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Abstract: (IOP)

DAMIC (Dark Matter in CCDs) is an experiment searching for dark matter particles employing fully-depleted charge-coupled devices. Using the bulk silicon which composes the detector as target, we expect to observe coherent WIMP-nucleus elastic scattering. Although located in the SNOLAB laboratory, 2 km below the surface, the CCDs are not completely free of radioactive contamination, in particular coming from radon daughters or from the detector itself. We present novel techniques for the measurement of the radioactive contamination in the bulk silicon and on the surface of DAMIC CCDs. Limits on the Uranium and Thorium contamination as well as on the cosmogenic isotope (32) Si, intrinsically present on the detector, were performed. We have obtained upper limits on the (238) TJ ((232) Th) decay rate of 5 (15) kg(_1) d(_1) at 95% CL. Pairs of spatially correlated electron tracks expected from (32) Si-(32) P and (210) Pb-(210) Bi beta decays were also measured. We have found a decay rate of 80+(l10) -65 kg(_1) d(_1) for (32) Si and an upper limit of - 35 kg-(1) d(-1) for (210) Pb, both at 95% CL.

talk: Torino 2015/09/07
WIMP nucleus: elastic scattering
photon: detector
electron: tracks
CCD
background: radioactivity
dark matter: detector
decay rate
surface
silicon

References(8)

Figures(0)

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Alvaro E. Chavarria
(
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)
,
Javier Tiffenberg
(
- Fermilab
)
,
Alexis Aguilar-Arevalo
(
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,
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(
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)
,
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•

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(
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)

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,
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(
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,
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