Author/Authors :
Burgos، نويسنده , , S. M. Forbes، نويسنده , , J. and Ghag، نويسنده , , C. S. Gold، نويسنده , , M. and Kudryavtsev، نويسنده , , V.A and Lawson، نويسنده , , T.B. and Loomba، نويسنده , , D. and Majewski، نويسنده , , P. and Muna، نويسنده , , D. and Murphy، نويسنده , , A. StJ. and Nicklin، نويسنده , , G.G. and Paling، نويسنده , , S.M. and Petkov، نويسنده , , A. and Plank، نويسنده , , S.J.S. and Robinson، نويسنده , , M. and Sanghi، نويسنده , , N.، نويسنده ,
Abstract :
Data from the DRIFT-IIa directional dark matter experiment are presented, collected during a near continuous 6 month running period. A detailed calibration analysis comparing data from gamma-ray, X-ray and neutron sources to a GEANT4 Monte Carlo simulations reveals an efficiency for detection of neutron induced recoils of 94 ± 2(stat.) ± 5(sys.)%. Software-based cuts, designed to remove non-nuclear recoil events, are shown to reject 60Co gamma-rays with a rejection factor of better than 8 × 10−6 for all energies above threshold. An unexpected event population has been discovered and is shown here to be due to the alpha-decay of 222Rn daughter nuclei that have attached to the central cathode. A limit on the flux of neutrons (<4 neutrons recoils day−1) in the Boulby Underground Laboratory is derived from analysis of unshielded and shielded data.
Keywords :
Radon detection , Negative ion TPC , Neutralino , WIMP , drift , directionality , Dark matter
