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

Abstract

This paper gives an estimation of the number of neutrinos which can be registered in Borexino detector from the Sun neutrinos generated in reaction ${}^{7}Be+e^{-}{\to }^{7}Li+{\nu }_e$ with energy $E_{{\nu }_e}=0.862MeV$ in the absence of neutrino oscillations. This number is supposed be between $N^{theor}=86.45÷96.52\frac{counters}{(day\cdot 100ton)}$ in dependence on primary neutrino fluxes. Then ratios between number of neutrinos $N^{exper}$ registered in Borexino detector and counted numbers $N^{theor}$, are $\frac{N^{exper}}{N^{theor}}=0.49÷0.54$. This value is close enough to the same value obtained in ${}^{71}Ga{-}^{71}Ge$ experiments in the close energy regions. The value $\frac{N^{exper}}{N^{theor}}$ obtained at supposition that ${\theta }_{13}\approx 0$ and absence of the resonance effect approximately equal to $\simeq 0.67$ and it is noticeably greater than the above value. Probably it means that the supposition that ${\theta }_{13}\approx 0$ is not justified and there can be a definite deposit of $\tau$ neutrinos.

Comments: 9 pages, no figuries