Study of solar and other unknown anti-neutrino fluxes with Borexino at LNGS

2010/09/30 by G. Bellini, Borexino Collaboration · 1 citation
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1016/j.physletb.2010.12.030

published as Phys.Lett.B696:191-196,2011 · 8 pages, 2 figures, 1 table

arxiv created 2010/09/30 · arxiv updated 2011/01/17

Abstract

We report on the search for anti-neutrinos of yet unknown origin with the Borexino detector at the Laboratori Nazionali del Gran Sasso. In particular, a hypothetical anti-neutrino flux from the Sun is investigated. Anti-neutrinos are detected through the neutron inverse β decay reaction in a large liquid organic scintillator target. We set a new upper limit for a hypothetical solar ν_e flux of 760 \rm cm^-2\rm s^-1, obtained assuming an undistorted solar ⁸B energy spectrum. This corresponds to a limit on the transition probability of solar neutrinos to anti-neutrinos of 1.3×10^-4 (90% C.L.) for E_ν>1.8 MeV, covering the entire ⁸B spectrum. Best differential limits on anti-neutrino fluxes from unknown sources are also obtained between the detection energy threshold of 1.8 MeV and 17.8 MeV with more than 2 years of data.

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