Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..osf.c2004k&link_type=abstract
American Physical Society, Fall Meeting of the Ohio Section, October 17-18, 2003, Case Western Reserve University, Cleveland Ohi
Physics
Scientific paper
The Cryogenic Dark Matter Search uses position sensitive Ge and Si crystals in the direct detection of Weakly Interacting Massive Particles (WIMPs), believed to constitute most of the dark matter in the Universe. By simultaneously measuring ionization and phonon energies deposited from particle interactions in the crystals, the detectors use event-by-event discrimination to eliminate the predominant gamma and beta backgrounds. As both neutrons and WIMPs exhibit nuclear recoils, Monte Carlo simulations are used to estimate, and subtract, the limiting background from fast neutrons arising from cosmic ray interactions. Past experimental Runs at the Stanford Underground Facility helped set limits on the spin-independent WIMP-nucleon elastic-scattering crosssection. Analysis of data from a recent Run there point to the detectors demonstrating photon rejection efficiencies >99.85% and beta rejection >95% with additional shielding further reducing the neutron background. The results set limits on the WIMP-nucleon cross-section that are lower than previous findings for high WIMP masses and exclude new parameter space for WIMPs with masses between 8 - 20 GeV c-2. The experiment has since shifted to the 713 meter deep Soudan Underground Facility where data taking is currently in progress. This will further attenuate the backgrounds from 1 to 0.01 event/kg-days, increasing WIMP sensitivities by a factor of 100.
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