A Search for Neutrinos from the Solar hep Reaction and the Diffuse Supernova Neutrino Background with the Sudbury Neutrino Observatory

Abstract

A search has been made for neutrinos from the hep reaction in the Sun and from the diffuse supernova neutrino background (DSNB) using data collected during the first operational phase of the Sudbury Neutrino Observatory, with an exposure of 0.65 kilotonne-years. For the hep neutrino search, two events are observed in the effective electron energy range of 14.3 MeV <T_eff< 20 MeV where 3.1 background events are expected. After accounting for neutrino oscillations, an upper limit of 2.3x10^4 cm^-2s^-1 at the 90% confidence level is inferred on the integral total flux of hep neutrinos. For DSNB neutrinos, no events are observed in the effective electron energy range of 21 MeV <T_eff< 35 MeV and, consequently, an upper limit on the nu_e component of the DSNB flux in the neutrino energy range of 22.9 MeV <E_nu< 36.9 MeV of 70 cm^-2s^-1 is inferred at the 90% confidence level. This is an improvement by a factor of 6.5 on the previous best upper limit on the hep neutrino flux and by two orders of magnitude on the previous upper limit on the ${\nu }_e$ component of the DSNB flux.

12 pages, 5 figures, accepted for publication by ApJ. Minor updates to address referees comments

References in corpus (1)

• The diffuse neutrino flux from supernovae: upper limit on the electron neutrino component from the non-observation of antineutrinos at SuperKamiokande

Cited by in corpus (39)

• Neutrino Physics with JUNO
• Solar fusion cross sections II: the pp chain and CNO cycles
• Phenomenology with Massive Neutrinos
• Supernova Neutrino Detection
• Solar Neutrino Measurements in Super-Kamiokande-IV
• Supernova Relic Neutrino Search at Super-Kamiokande
• Neutrino Coherent Scattering Rates at Direct Dark Matter Detectors
• A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics
• Search for extraterrestrial antineutrino sources with the KamLAND detector
• Letter of Intent: Jinping Neutrino Experiment
• Diffuse Supernova Neutrino Background Search at Super-Kamiokande
• Solar Neutrinos as a Signal and Background in Direct-Detection Experiments Searching for Sub-GeV Dark Matter With Electron Recoils
• Diffuse supernova neutrinos at underground laboratories
• The Sudbury Neutrino Observatory
• Improved measurement of ${}^8$B solar neutrinos with 1.5 kt y of Borexino exposure
• Spectrum of the Supernova Relic Neutrino Background and Metallicity Evolution of Galaxies
• Synoptic Sky Surveys and the Diffuse Supernova Neutrino Background: Removing Astrophysical Uncertainties and Revealing Invisible Supernovae
• Neutrino Spectrum from SN 1987A and from Cosmic Supernovae
• Shockwaves in Supernovae: New Implications on the Diffuse Supernova Neutrino Background
• Neutrino physics with dark matter detectors
• Discovery potential for supernova relic neutrinos with slow liquid scintillator detectors
• Neutrinos from failed supernovae at future water and liquid argon detectors
• Impact of COHERENT measurements, cross section uncertainties and new interactions on the neutrino floor
• Upper limits on the diffuse supernova neutrino flux from the SuperKamiokande data
• CNO Neutrino Grand Prix: The race to solve the solar metallicity problem
• Search for $hep$ solar neutrinos and the diffuse supernova neutrino background using all three phases of the Sudbury Neutrino Observatory
• Solar fusion III: New data and theory for hydrogen-burning stars
• The Cosmic MeV Neutrino Background as a Laboratory for Black Hole Formation
• Quark Nugget Dark Matter: No contradictions with neutrino flux constraints
• Testing neutrino spectra formation in collapsing stars with the diffuse supernova neutrino flux
• Measurement of neutrino flux from the primary proton--proton fusion process in the Sun with Borexino detector
• Neutrino non-radiative decay and the diffuse supernova neutrino background
• Hidden MeV-Scale Dark Matter in Neutrino Detectors
• Cosmogenic Neutron Production at the Sudbury Neutrino Observatory
• Recommended conventions for reporting results from direct dark matter searches
• First Detailed Calculation of Atmospheric Neutrino Foregrounds to the Diffuse Supernova Neutrino Background in Super-Kamiokande
• Search for the second forbidden beta decay of 8B to the ground state of 8Be
• Light Higgs boson scenario in the SUSY seesaw model
• Status and Perspectives of Neutrino Physics