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T: Teilchenphysik

T 511: Halbleiterdetektoren IV

T 511.2: Talk

Wednesday, March 25, 1998, 16:45–17:00, HS K

Direct Search for WIMPs with New Heidelberg Germanium Experiments — •L. Baudis, J. Hellmig, H.V. Klapdor–Kleingrothaus, B. Majorovits, Y. Ramachers, and H. Strecker — Max–Planck–Institut f"ur Kernphysik, Postfach 103 980, 69029 Heidelberg

We report about two new projects for Ge–semiconductor dark matter WIMP detectors: the HDMS and the GENIUS detector. HDMS will drastically reduce the Compton background due to the use of anticoincidence between two Ge-detectors. We expect to improve WIMP-nucleon cross section limits to a level comparable to planned cryogenic experiments. The HDMS–detector is now in the Gran Sasso Underground Laboratory and will start operating in 1997.

GENIUS is planned as a further step for the future [1]. It will be a high-mass (1 ton) Ge experiment with a much further reduced background. Therefore it will be able to give a WIMP limit of the order 0.01 cpd/kg and additionally to look for the annual modulation WIMP-signature by using raw data without subtraction. In the search for neutralinos as dark matter it will be largely competitive to LHC.
[1] H.V. Klapdor–Kleingrothaus, J. Hellmig, M. Hirsch, J. Phys. G, in print