Direction-sensitive dark matter search with the low-background gaseous detector NEWAGE-0.3b”

Abstract NEWAGE is a direction-sensitive dark matter search using low-pressure gaseous time projection chamber. A low alpha-ray emission rate micro pixel chamber had been developed in order to reduce background for search. We conducted the at Kamioka Observatory 2018. The total live was 107.6 d, corresponding an exposure of 1.1 kg$\>$d. Two events remained energy region 50–60 keV, which consistent with expected 2.5 events. directional analysis carried out and no significant forward–backward asymmetry derived from WIMP-nucleus elastic scatterings found. Thus 90$\%$ confidence level upper limit on spin-dependent WIMP-proton cross-section 50 pb WIMP mass 100 GeV$\>c^{-2}$ derived. This most stringent yet obtained experiments.