Mainz 2004 – scientific programme

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T: Teilchenphysik

T 404: Neutrinomassen

T 404.7: Talk

Wednesday, March 31, 2004, 15:30–15:45, HS V

Status of the HEIDELBERG-MOSCOW Experiment 2003. — •Irina Krivosheina, Hans Volker Klapdor-Kleingrothaus, Alexander Dietz, and Oleg Chkvorets — Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1,D-69117 HEIDELBERG,GERMANY

The HEIDELBERG-MOSCOW Double-Beta-Decay experiment in GRAN SASSO has collected data in the period August 1990 - 2003. The measurement and the analysis of the data is presented. The collected statistics is 71.7 kg y. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/kg y keV. The two-neutrino accompanied half-life is determined on the basis of more than 100 000 events. The confidence level for the neutrinoless signal has been improved.