Speaker
Description
The NEWS-G (New Experiments With Spheres – Gas) collaboration searches for light dark matter using spherical proportional counters (SPCs) located in deep underground laboratories. A choice of light gas targets (Ne, He, H) in conjunction with sub-KeV nuclear recoil thresholds allow for sensitivity to low-mass WIMPs (Weakly Interacting Massive Particles) down to 0.1 GeV/c^2. The recent results from SEDINE, a 60-cm diameter SPC located at LSM (Laboratoire Souterrain de Modane), set new constraints for WIMP masses lighter than 0.6 GeV/c^2. The principle of operations, a description of the 140cm diameter detector with compact shielding and with projected sensitivity will be presented. Preliminary results obtained with a temporary shield at the underground laboratory of Modane (LSM, France) with neon and methane as target gases will also be presented. Installation is ongoing in SNOLAB (Canada) and commissioning is expected in April 2020.
