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VOLUME 76 | ISSUE 7 | PAGE 483
Search for the neutrino radiative decay with the prototype of the Borexino detector
PACS: 13.15.+g, 14.60.Pq
Abstract
Results of background measurements with the prototype of the Borexino detector have been used to obtain bounds on the lifetime of the radiative neutrino decay \nu _{H}\rightarrow \nu_{L}+\gamma. The new lower limit for the lifetime of pp and 7Be neutrinos is \tau _{c.m.}(\nu _{H}\rightarrow \nu
_{L}+\gamma)/m_{\nu }\geq 4.2\cdot 10^{3} {\rm s\cdot eV}^{-1} (α=0). It is more than one order of magnitude stronger than obtained in previous experiments using nuclear reactors and accelerators.