Simultaneous Precision Spectroscopy of $pp$, ${}^7$Be, and $pep$ Solar Neutrinos with Borexino Phase-II

Abstract

We present the first simultaneous measurement of the interaction rates of $pp$, ${}^7$Be, and $pep$ solar neutrinos performed with a global fit to the Borexino data in an extended energy range (0.19-2.93)MeV. This result was obtained by analyzing 1291.51days of Borexino Phase-II data, collected between December 2011 and May 2016 after an extensive scintillator purification campaign. We find: rate($pp$)=$134$$\pm$$10$($stat$)${}_{-10}^{+6}$($sys$)cpd/100t, rate(${}^7$Be)=$48.3$$\pm$$1.1$($stat$)${}_{-0.7}^{+0.4}$($sys$)cpd/100t, and rate($pep$)=$2.43$$\pm$$0.36$($stat$)${}_{-0.22}^{+0.15}$($sys$)cpd/100t. These numbers are in agreement with and improve the precision of our previous measurements. In particular, the interaction rate of ${}^7$Be $\nu$'s is measured with an unprecedented precision of 2.7%, showing that discriminating between the high and low metallicity solar models is now largely dominated by theoretical uncertainties. The absence of $pep$ neutrinos is rejected for the first time at more than 5$\sigma$. An upper limit of $8.1$cpd/100t (95%C.L.) on the CNO neutrino rate is obtained by setting an additional constraint on the ratio between the $pp$ and $pep$ neutrino rates in the fit. This limit has the same significance as that obtained by the Borexino Phase-I (currently providing the tightest bound on this component), but is obtained by applying a less stringent constraint on the $pep$ $\nu$ flux.

arXiv comment8 pages, 7 figures

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