CDMS-II to SuperCDMS: WIMP search at a zeptobarn
Abstract
The Cryogenic Dark Matter search experiment (CDMS) employs low-temperature Ge and Si detectors to detect WIMPs via their elastic scattering of target nuclei. The last analysis with an germanium exposure of 397.8 kg-days resulted in zero observed candidate events, setting an upper limit on the spin-independent WIMP-nucleon cross-section of 6.6 x 10-44 cm2 (4.6 x 10-44 cm2, when previous CDMS Soudan data is included) for a WIMP mass of 60 GeV. The improvements in the surface event rejection capability for the current analysis with an germanium exposure about a factor of 2.5 greater than used in the last analysis will be discussed. To increase the sensitivity beyond the 1 x 10-44 cm2 benchmark new 1 inch thick detectors have been developed. A first tower consisting of six of these detectors has been successfully installed at the Soudan site. These detectors will be used in a 15 kg SuperCDMS stage with an expected sensitivity on the spin-independent WIMP-nucleon elastic scattering cross-section of 5 x 10-45 cm2. In addition, the CDMS Collaboration has started to look for signatures of non WIMP dark matter particles, which may explain the annual modulation signature observed by DAMA.
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