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Search for double- beta decays of 96Ru and 104Ru by ultra-low background HPGe gamma spectrometry |
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| Authors: | P. Belli R. Bernabei F. Cappella R. Cerulli F. A. Danevich S. d’Angelo A. Incicchitti M. Laubenstein O. G. Polischuk D. Prosperi V. I. Tretyak |
| Affiliation: | 1. Dipartimento di Fisica, Università di Roma “Tor Vergata” and INFN, Sezione di Roma “Tor Vergata”, I-00133, Roma, Italy 2. Dipartimento di Fisica, Università di Roma “La Sapienza” and INFN, Sezione di Roma, I-00185, Roma, Italy 3. INFN, Laboratori Nazionali del Gran Sasso, I-67010, Assergi (Aq), Italy 4. Institute for Nuclear Research, MSP 03680, Kyiv, Ukraine |
| Abstract: | A search for double- $ beta$ processes in 96Ru and 104Ru was realized in the underground Gran Sasso National Laboratories of the INFN (Italy) with the help of ultra-low background HPGe $ gamma$ spectrometry. After 158h of data taking with 473g ruthenium sample, new improved limits on double-beta processes in 96Ru have been established on the level of 1018-1019yr. For the first time the double-beta decay of 104Ru to the 2+ 1 excited level of 104Pd has been restricted as T 1/2 > 3.5×1019 yr. |
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