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High sensitivity GEM experiment on double beta decay of 76-Ge

Yu. G. Zdesenko·O. A. Ponkratenko·V. I. Tretyak
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Abstract

The GEM project is designed for the next generation 2 beta decay experiments with 76-Ge. One ton of ''naked'' HP Ge detectors (natural at the first GEM-I phase and enriched in 76-Ge to 86% at the second GEM-II stage) are operating in super-high purity liquid nitrogen contained in the Cu vacuum cryostat (sphere with diameter 5 m). The latest is placed in the water shield. Monte Carlo simulation evidently shows that sensitivity of the experiment (in terms of the T1/2 limit for neutrinoless 2 beta decay) is 10^27 yr with natural HP Ge crystals and 10^28 yr with enriched ones. These bounds corresponds to the restrictions on the neutrino mass less than 0.05 eV and 0.015 eV with natural and enriched detectors, respectively. Besides, the GEM-I set up could advance the current best limits on the existence of neutralinos - as dark matter candidates - by three order of magnitudes, and at the same time would be able to identify unambiguously the dark matter signal by detection of its seasonal modulation.

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Yu. G. Zdesenko, O. A. Ponkratenko, V. I. Tretyak. 2001-06-26. High sensitivity GEM experiment on double beta decay of 76-Ge. https://doi.org/10.1088/0954-3899%2F27%2F10%2F312

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