Article
Study of Solar and Other Unknown Anti-Neutrino Fluxes with Borexino at LNGS
Physics Letters B (2011)
• , University of Massachusetts - Amherst
Keywords
• anti-neutrinos,
• solar neutrinos,
• neutrino detector,
• liquid scintillator
Disciplines
Publication Date
January 31, 2011
Publisher Statement
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 $\beta$ decay reaction in a large liquid organic scintillator target. We set a new upper limit for a hypothetical solar $\bar{\nu}_e$ flux of 760 ${\rm cm}^{-2}{\rm s}^{-1}$, obtained assuming an undistorted solar $^8$B energy spectrum. This corresponds to a limit on the transition probability of solar neutrinos to anti-neutrinos of $1.3\times10^{-4}$ (90\% C.L.) for $E_{\bar{\nu}}>1.8$ MeV, covering the entire $^{8}$B 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.
Citation Information
G. Bellini, J. Benzinger, S. Bonetti, M. Buizza Avanzini, et al.. "Study of Solar and Other Unknown Anti-Neutrino Fluxes with Borexino at LNGS" Physics Letters B Vol. 696 Iss. 3 (2011)
Available at: http://works.bepress.com/andrea_pocar/10/