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Search for Light Dark Matter with NEWS-G at the Laboratoire Souterrain de Modane Using a Methane Target
M M Arora1, L Balogh1, C Beaufort2
1Queen's University, Department of Mechanical and Materials Engineering, Kingston, Ontario K7L 3N6, Canada.
Abstract:
The NEWS-G direct detection experiment uses spherical proportional counters to search for light dark matter candidates. New results from a 10 day physics run with a 135 cm in diameter spherical proportional counter at the Laboratoire Souterrain de Modane are reported. The target consists of 114 g of methane, providing sensitivity to dark matter spin-dependent coupling to protons. New constraints are presented in the mass range 0.17 to 1.2 GeV/c^{2}, with a 90% confidence level cross-section upper limit of 30.9 pb for a mass of 0.76 GeV/c^{2}.
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