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If heavy neutrinos with mass $m_{\nu_{H}}\geq$2$ m_e $ are produced in theSun via the decay ${^8\rm{B}} \rightarrow {^8\rm{Be}} + e^+ + \nu_H$ in a sidebranch of pp-chain, they would undergo the observable decay into an electron, apositron and a light neutrino $\nu_{H}\rightarrow\nu_{L}+e^++e^-$. In thepresent work Borexino data are used to set a bound on the existence of suchdecays. We constrain the mixing of a heavy neutrino with mass 1.5 MeV $\leqm_{\nu_{H}} \le$ 14 MeV to be $|U_{eH}|^2\leq (10^{-3}-4\times10^{-6})$respectively. These are tighter limits on the mixing parameters than obtainedin previous experiments at nuclear reactors and accelerators.

New limits on heavy sterile neutrino mixing in ${^{8}\rm{B}}$-decay obtained with the Borexino detector