Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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P. Belli¹, R. Bernabei¹, C. J. Dai², H. L. He², G. Ignesti³, A. Incicchitti³, H. H. Kuang², J. M. Ma², F. Montecchia¹, O. A. Ponkratenko⁴, D. Prosperi³, V. I. Tretyak⁴, Yu. G. Zdesenko⁴

Abstract: The background measurements have been performed in the Gran Sasso National Laboratory of INFN with the help of the large mass (≅100 kg) highly radiopure DAMA NaI(Tl) set up. Using statistics of 19511 kg · day, new limit on the mean life of the electron was established for "disappearance" channel: τ_e(e^- → ν_eν_eν_e) > 4.2 (2.4) · 10²⁴ y at 68 % (90 %) C.L.

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