Simultaneous precision spectroscopy of p p , 7Be, and p e p solar neutrinos with Borexino Phase-II

We present the simultaneous measurement of the interaction rates R_{p p}, R_Be, R_{p e p} of p p , ⁷Be, and p e p solar neutrinos performed with a global fit to the Borexino data in an extended energy range (0.19-2.93) MeV with particular attention to details of the analysis methods. This result was obtained by analyzing 1291.51 days of Borexino Phase-II data, collected after an extensive scintillator purification campaign. Using counts per day (cpd )/100 ton as unit, we find R_{p p}=134 ±10 (stat )_-10⁺⁶(sys ) , R_{B e}=48.3 ±1.1 (stat )_-0.7^+0.4(sys ) ; and R_p^{e p HZ}=2.43 ±0.36 (stat )_-0.22^+0.15(sys ) assuming the interaction rate R_CNO of CNO-cycle (Carbon, Nitrogen, Oxigen) solar neutrinos according to the prediction of the high metallicity standard solar model, and R_p^{e p LZ}=2.65 ±0.36 (stat )_-0.24^+0.15(sys ) according to that of the low metallicity model. An upper limit R_CNO<8.1 cpd /100 ton (95% C.L.) is obtained by setting in the fit a constraint on the ratio R_{p p}/R_{p e p} (47.7 ±0.8 cpd /100 ton or 47.5 ±0.8 cpd /100 ton according to the high or low metallicity hypothesis).