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First results of the experiment to search for double beta decay of 106Cd with 106CdWO4 crystal scintillator in coincidence with four crystals HPGe detector

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arxiv 1312.5773 v1 pith:BGBVOUTL submitted 2013-12-19 nucl-ex

V.I. Tretyak , P. Belli , R. Bernabei , V.B. Brudanin , F. Cappella , V. Caracciolo , R. Cerulli , D.M. Chernyak
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F.A. Danevich S. d'Angelo A. Incicchitti M. Laubenstein V.M. Mokina D.V. Poda O.G. Polischuk R.B. Podviyanuk I.A. Tupitsyna
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keywords betacdwo4crystaldoubleexperimentscintillatorcoincidencecrystals
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An experiment to search for double beta processes in 106Cd by using cadmium tungstate crystal scintillator enriched in 106Cd (106CdWO4) in coincidence with the four crystals HPGe detector GeMulti is in progress at the STELLA facility of the Gran Sasso underground laboratory of INFN (Italy). The 106CdWO4 scintillator is viewed by a low-background photomultiplier tube through a lead tungstate crystal light-guide produced from deeply purified archaeological lead to suppress gamma quanta from the photomultiplier tube. Here we report the first results of the experiment after 3233 hours of the data taking. A few new improved limits on double beta processes in 106Cd are obtained, in particular T1/2(2nuECb+) > 8.4e20 yr at 90% C.L.

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