PoS - Proceedings of Science
Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T03: Dark Matter
NEWS-G: Search for Light Dark Matter with a Spherical Proportional Counter
P. Knights*  on behalf of the NEWS-G collaboration
Full text: pdf
Pre-published on: January 17, 2022
Published on: May 12, 2022
Abstract
The NEWS-G collaboration is searching for light dark matter candidates using a novel detector
concept, the spherical proportional counter. Access to the mass range from 0.05 − 10 GeV is
enabled by the combination of low energy threshold, light gaseous targets (H, He, Ne), and highly
radio-pure detector construction. Initial NEWS-G results obtained with SEDINE, a 60 cm in
diameter spherical proportional counter operating at LSM (France), excluded for the first time
WIMP-like dark matter candidates down to masses of 0.5 GeV. NEWS-G has now constructed
a 140 cm in diameter, spherical proportional counter using 4N copper with a 500 m electroplated
inner layer. The detector is currently being commissioned in SNOLAB. The detector will use
a read-out technology incorporating resistive materials and multiple anodes, which enable high
gain and high-pressure operation. Future NEWS-G detectors which will be fully electroformed
underground are also being designed.
DOI: https://doi.org/10.22323/1.398.0139
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