Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2010-01-18
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
4 pages, 3 figures. Prepared for 5th Patras Workshop on Axions, WIMPs and WISPs, Durham, England, 13-17 July 2009
Scientific paper
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} cm^2 (4.6 x 10^{-44} cm^2, 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} cm^2 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} cm^2. 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.
Bruch Tobias
for the CDMS Collaboration
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