This paper reports a direct measurement of the { { } ^ { 7 } } Be solar neutrino signal rate performed with the Borexino low background liquid scintillator detector .
This is the first real-time spectral measurement of sub-MeV solar neutrinos .
The result for 0.862 MeV { { } ^ { 7 } } Be neutrinos is 47 \pm 7 _ { stat } \pm 12 _ { sys } counts/ ( day \cdot 100 ton ) , consistent with predictions of Standard Solar Models and neutrino oscillations with LMA-MSW parameters .