Performance of the EDELWEISS-III experiment for direct dark matter searches

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90072%2F17%3A00344156" target="_blank" >RIV/68407700:90072/17:00344156 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1088/1748-0221/12/08/P08010" target="_blank" >https://doi.org/10.1088/1748-0221/12/08/P08010</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1748-0221/12/08/P08010" target="_blank" >10.1088/1748-0221/12/08/P08010</a>

Result language

angličtina

Original language name

Performance of the EDELWEISS-III experiment for direct dark matter searches

Original language description

We present the results of measurements demonstrating the efficiency of the EDELWEISS-III array of cryogenic germanium detectors for direct dark matter searches. The experimental setup and the FID (Fully Inter-Digitized) detector array is described, as well as the efficiency of the double measurement of heat and ionization signals in background rejection. For the whole set of 24 FID detectors used for coincidence studies, the baseline resolutions for the fiducial ionization energy are mainly below 0.7 keV(ee) (FHWM) whereas the baseline resolutions for heat energies are mainly below 1.5 keV(ee) (FWHM). The response to nuclear recoils as well as the very good discrimination capability of the FID design has been measured with an AmBe source. The surface beta- and alpha-decay rejection power of R-surf < 4 x 10(-5) per alpha at 90% C. L. has been determined with a 210Pb source, the rejection of bulk gamma-ray events has been demonstrated using gamma-calibrations with (133B)a sources leading to a value of R gamma(-mis-fid) < 2 : 5 x 10(-6) at 90% C. L.. The current levels of natural radioactivity measured in the detector array are shown as the rate of single gamma background. The fiducial volume fraction of the FID detectors has been measured to a weighted average value of (74.6 +/- 0.4)% using the cosmogenic activation of the Zn-65 and Ge-68,Ge-71 isotopes. The stability and uniformity of the detector response is also discussed. The achieved resolutions, thresholds and background levels of the upgraded EDELWEISS-III detectors in their setup are thus well suited to the direct search of WIMP dark matter over a large mass range.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

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Continuities

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Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Instrumentation

ISSN

1748-0221

e-ISSN

1748-0221

Volume of the periodical

12

Issue of the periodical within the volume

P08010

Country of publishing house

IT - ITALY

Number of pages

46

Pages from-to

1-46

UT code for WoS article

000414159500010

EID of the result in the Scopus database

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