KamLAND Bounds on Solar Antineutrinos and neutrino transition magnetic moments

Abstract

We investigate the possibility of detecting solar electron antineutrinos with the KamLAND experiment. These electron antineutrinos are predicted by spin-flavor oscillations at a significant rate even if this mechanism is not the leading solution to the SNP. KamLAND is sensitive to antineutrinos originated from solar ${}^8$B neutrinos. From KamLAND negative results after 145 days of data taking, we obtain model independent limits on the total flux of solar electron antineutrinos $\Phi ({}^{8}B)<1.1-3.5\times 10^{4}c{m}^{-2}{s}^{-1}$, more than one order of magnitude smaller than existing limits, and on their appearance probability $P<0.15$ (95% CL). Assuming a concrete model for antineutrino production by spin-flavor precession, this upper bound implies an upper limit on the product of the intrinsic neutrino magnetic moment and the value of the solar magnetic field $\mu B<2.3\times 10^{-21}$ MeV 95% CL (for LMA $(\Delta m^2,{\tan }^2\theta )$ values). Limits on neutrino transition moments are also obtained. For realistic values of other astrophysical solar parameters these upper limits would imply that the neutrino magnetic moment is constrained to be, in the most conservative case, $μ\lsim 3.9\times 10^{-12} μ_B$ (95% CL) for a relatively small field $B=50$ kG. For higher values of the magnetic field we obtain: $μ\lsim 9.0\times 10^{-13} μ_B$ for field $B=200$ kG and $μ\lsim 2.0\times 10^{-13} μ_B$ for field $B=1000$ kG at the same statistical significance.

13 pages, 2 figures

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Cited by in corpus (13)

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• Enhanced solar anti-neutrino flux in random magnetic fields
• Neutrino mass parameters from Kamland, SNO and other solar evidence
• Resonant spin-flavor conversion of supernova neutrinos: Dependence on presupernova models and future prospects
• A comprehensive study of neutrino spin-flavour conversion in supernovae and the neutrino mass hierarchy
• LMA and sterile neutrinos: a case for resonance spin flavour precession?
• KamLAND, solar antineutrinos and the solar magnetic field
• The Neutrino mass matrix after Kamland and SNO salt enhanced results
• Dark consequences from light neutrino condensations
• Neutrino spin-flavor oscillations in solar environment
• Phenomenological implication of KamLAND on lepton mass matrices
• KamLAND and Solar Antineutrino Spectrum
• Neutrino transition magnetic moments and the solar magnetic field on the light of the Kamland evidence