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Largest physics meeting of the year: March 20-25, 2011, Dallas, Texas
Date:2/9/2011

g/Meeting/MAR11/SessionIndex2/?SessionEventID=139300">http://meetings.aps.org/Meeting/MAR11/SessionIndex2/?SessionEventID=139300

HIGH-PURITY GERMANIUM CRYSTALS FOR DARK MATTER EXPERIMENTS

More than 80% of the matter in the universe is a mystery to science. We call it dark matter, and though we know it exists, we don't know what it is and we have never been able to detect it directly. A number of new experiments to detect dark matter are underway in Japan, Europe, Canada, and the United States. These experiments are being conducted deep underground, hidden from the interfering radiation produced by cosmic ray showers. Dongming Mei from the University of South Dakota will describe the latest results in preparation of high-purity germanium crystals for the proposed experiments for the Deep Underground Science and Engineering Laboratory (DUSEL). The laboratory is being constructed more than a mile underground in the former Homestake gold mine in Lead, S.D. Mei and his colleagues are studying how to grow large crystals of high-purity germanium up to a few kg in weight in the underground environment at DUSEL in order to detect dark matter and to study neutrinos. Once in place about two years from now, the crystals will be used to detect particles of dark matter, as well as other rare and exotic phenomena. Mei will also present techniques for identifying impurity levels that can degrade the crystals' performance.
A11.00012 http://meetings.aps.org/Meeting/MAR11/Event/136468

SELF-PROPELLED MINI MACHINES

Rachita Sharma and colleagues at North Carolina State University have developed a technique for remotely steering millimeter-sized machines that are self-propelling when placed in a fluctuating electric field. Like miniature boats, the tiny machines float on water and pump microscopic amounts of fluid across their surface when the electric field is turned on, wh
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Contact: James Riordon
riordon@aps.org
301-209-3238
American Physical Society
Source:Eurekalert

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