Improved measurement of ${}^8$B solar neutrinos with 1.5 kt y of Borexino exposure

Abstract

We report on an improved measurement of the ${}^8$B solar neutrino interaction rate with the Borexino experiment at the Laboratori Nazionali del Gran Sasso. Neutrinos are detected via their elastic scattering on electrons in a large volume of liquid scintillator. The measured rate of scattered electrons above 3 MeV of energy is $0.223\begin{array}{c}+0.015\\ -0.016\end{array}(stat)\begin{array}{c}+0.006\\ -0.006\end{array}(syst)$ cpd/100 t, which corresponds to an observed solar neutrino flux assuming no neutrino flavor conversion of $\Phi \begin{array}{c}\mathrm{ES}\\ {}^8\mathrm{B}\end{array}=2.57\begin{array}{c}+0.17\\ -0.18\end{array}(stat)\begin{array}{c}+0.07\\ -0.07\end{array}(syst)\times$10${}^6$ cm${}^{-2}$s${}^{-1}$. This measurement exploits the active volume of the detector in almost its entirety for the first time, and takes advantage of a reduced radioactive background following the 2011 scintillator purification campaign and of novel analysis tools providing a more precise modeling of the background. Additionally, we set a new limit on the interaction rate of solar $hep$ neutrinos, searched via their elastic scattering on electrons as well as their neutral current-mediated inelastic scattering on carbon, ${}^{12}$C($\nu ,{\nu }^{\prime }$)${}^{12}$C* ($E_{\gamma }$= 15.1 MeV).

arXiv comment14 pages, 13 figures, 4 tables

References in corpus (25)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• The GENIE Neutrino Monte Carlo Generator
• Updated fit to three neutrino mixing: exploring the accelerator-reactor complementarity
• Solar neutrino measurements in Super-Kamiokande-I
• New results on solar neutrino fluxes from 192 days of Borexino data
• The Borexino detector at the Laboratori Nazionali del Gran Sasso
• A new Generation of Standard Solar Models
• Atmospheric neutrino flux calculation using the NRLMSISE00 atmospheric model
• Solar Neutrino Measurements in Super-Kamiokande-IV
• Measurement of the solar 8B neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector
• Final results of Borexino Phase-I on low energy solar neutrino spectroscopy
• First evidence of pep solar neutrinos by direct detection in Borexino
• Production of Radioactive Isotopes through Cosmic Muon Spallation in KamLAND
• Measurements of extremely low radioactivity levels in BOREXINO
• Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth
• Muon and Cosmogenic Neutron Detection in Borexino
• Borexino calibrations: Hardware, Methods, and Results
• The ${}^8$B Neutrino Spectrum
• A Search for Neutrinos from the Solar hep Reaction and the Diffuse Supernova Neutrino Background with the Sudbury Neutrino Observatory
• Cosmogenic 11C production and sensitivity of organic scintillator detectors to pep and CNO neutrinos
• Pulse-Shape discrimination with the Counting Test Facility
• Radiogenic Neutron Yield Calculations for Low-Background Experiments
• The Monte Carlo simulation of the Borexino detector
• A search for low-energy neutrino and antineutrino signals correlated with gamma-ray bursts with Borexino
• The Borexino Thermal Monitoring & Management System and simulations of the fluid-dynamics of the Borexino detector under asymmetrical, changing boundary conditions

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