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This paper gives an estimation of the number of neutrinos which can beregistered in Borexino detector from the Sun neutrinos generated in reaction$^{7}Be + e^{-} \to ^{7}Li + \nu_e$ with energy $E_{\nu_e} = 0.862 MeV$ in theabsence of neutrino oscillations. This number is supposed be between $N^{theor} = 86.45 \div 96.52 \frac{counters}{(day\cdot 100\quad ton)}$ independence on primary neutrino fluxes. Then ratios between number of neutrinos$N^{exper}$ registered in Borexino detector and counted numbers $N^{theor}$,are $\frac{N^{exper}}{N^{theor}} = 0.49 \div 0.54$. This value is close enoughto the same value obtained in $^{71}Ga - ^{71}Ge$ experiments in the closeenergy regions. The value $\frac{N^{exper}}{N^{theor}}$ obtained at suppositionthat $\theta_{1 3} \approx 0$ and absence of the resonance effect approximatelyequal to $\simeq 0.67$ and it is noticeably greater than the above value.Probably it means that the supposition that $\theta_{1 3} \approx 0$ is notjustified and there can be a definite deposit of $\tau$ neutrinos.

Computation of the number of neutrino events which can be registered in Borexino detector from the Sun neutrinos flux with energy $E_\nu = 0.862 MeV$