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 cm-2s-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 Eν>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.
Original language | English (US) |
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Pages (from-to) | 191-196 |
Number of pages | 6 |
Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Volume | 696 |
Issue number | 3 |
DOIs | |
State | Published - Jan 31 2011 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
Keywords
- Anti-neutrinos
- Liquid scintillator
- Neutrino detector
- Solar neutrinos