Final results of Borexino Phase-I on low energy solar neutrino spectroscopy

Abstract

Borexino has been running since May 2007 at the LNGS with the primary goal of detecting solar neutrinos. The detector, a large, unsegmented liquid scintillator calorimeter characterized by unprecedented low levels of intrinsic radioactivity, is optimized for the study of the lower energy part of the spectrum. During the Phase-I (2007-2010) Borexino first detected and then precisely measured the flux of the 7Be solar neutrinos, ruled out any significant day-night asymmetry of their interaction rate, made the first direct observation of the pep neutrinos, and set the tightest upper limit on the flux of CNO neutrinos. In this paper we discuss the signal signature and provide a comprehensive description of the backgrounds, quantify their event rates, describe the methods for their identification, selection or subtraction, and describe data analysis. Key features are an extensive in situ calibration program using radioactive sources, the detailed modeling of the detector response, the ability to define an innermost fiducial volume with extremely low background via software cuts, and the excellent pulse-shape discrimination capability of the scintillator that allows particle identification. We report a measurement of the annual modulation of the 7 Be neutrino interaction rate. The period, the amplitude, and the phase of the observed modulation are consistent with the solar origin of these events, and the absence of their annual modulation is rejected with higher than 99% C.L. The physics implications of phase-I results in the context of the neutrino oscillation physics and solar models are presented.

References in corpus (11)

• Observation of electron-antineutrino disappearance at Daya Bay
• Measurement of the solar neutrino capture rate with gallium metal. III: Results for the 2002--2007 data-taking period
• Solar neutrino measurements in Super-Kamiokande-II
• First Indication of Terrestrial Matter Effects on Solar Neutrino Oscillation
• Search for Solar Axions Produced in $p(d,{}^3\mathrm{He})\mathrm{A}$ Reaction with Borexino Detector
• A Scintillator Purification System for the Borexino Solar Neutrino Detector
• Pulse-Shape discrimination with the Counting Test Facility
• The Nylon Scintillator Containment Vessels for the Borexino Solar Neutrino Experiment
• Positronium signature in organic liquid scintillators for neutrino experiments
• Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran Sasso
• An approximation of the ideal scintillation detector line shape with a generalized gamma distribution

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