Solar neutrino and terrestrial antineutrino fluxes measured with Borexino at LNGS

Borexino Collaboration2

Research output: Contribution to journalConference article

Abstract

Borexino is a real time liquid scintillator detector for low energy neutrino and antineutrino spectroscopy located at the Gran Sasso National Laboratories (Italy). Thanks to its unique features - extremely low background, large scintillator mass (278 tons), low energy threshold and a carefully designed muon-veto system- it is giving a substantial contribution to key issues in many physics fields, like neutrino properties, solar physics, rare decays, Earth composition and heat balance. During the current year the Borexino collaboration efforts have been addressed to two main goals: the analysis of data set collected until December 2009 and the scintillator re-purification operations. Results obtained in 2010 concern: the update of solar 7Be-ν flux day/night asymmetry, the measurement of the solar 8B-ν flux with a lower threshold down to 3 MeV, the first observation of the geoneutrino signal at 4.2σ C.L., the measure of the European reactors antineutrino disappearence on a baseline of 1000 km, limits on the transition probability of solar neutrinos to antineutrinos and the most stringent up-to-date experimental bounds on Pauli exclusion principle violating transitions in 12C nuclei. Purification campaigns aiming to reduce mainly the 85Kr and 210Bi contaminants in the scintillator are in progress. The observed reduction of background is already sizeable and it is marking the beginning of a new phase of precision solar neutrino spectroscopy with an increased sensitivity to the more elusive components of solar neutrino flux like pep and CNO neutrinos.

Original languageEnglish
JournalProceedings of Science
Volume120
Publication statusPublished - Jan 1 2010
Externally publishedYes
Event35th International Conference of High Energy Physics, ICHEP 2010 - Paris, France
Duration: Jul 22 2010Jul 28 2010

Fingerprint

antineutrinos
solar neutrinos
scintillation counters
neutrinos
purification
solar physics
Pauli exclusion principle
heat balance
solar flux
thresholds
Italy
night
transition probabilities
spectroscopy
marking
contaminants
muons
reactors
asymmetry
physics

ASJC Scopus subject areas

  • General

Cite this

Solar neutrino and terrestrial antineutrino fluxes measured with Borexino at LNGS. / Borexino Collaboration2.

In: Proceedings of Science, Vol. 120, 01.01.2010.

Research output: Contribution to journalConference article

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abstract = "Borexino is a real time liquid scintillator detector for low energy neutrino and antineutrino spectroscopy located at the Gran Sasso National Laboratories (Italy). Thanks to its unique features - extremely low background, large scintillator mass (278 tons), low energy threshold and a carefully designed muon-veto system- it is giving a substantial contribution to key issues in many physics fields, like neutrino properties, solar physics, rare decays, Earth composition and heat balance. During the current year the Borexino collaboration efforts have been addressed to two main goals: the analysis of data set collected until December 2009 and the scintillator re-purification operations. Results obtained in 2010 concern: the update of solar 7Be-ν flux day/night asymmetry, the measurement of the solar 8B-ν flux with a lower threshold down to 3 MeV, the first observation of the geoneutrino signal at 4.2σ C.L., the measure of the European reactors antineutrino disappearence on a baseline of 1000 km, limits on the transition probability of solar neutrinos to antineutrinos and the most stringent up-to-date experimental bounds on Pauli exclusion principle violating transitions in 12C nuclei. Purification campaigns aiming to reduce mainly the 85Kr and 210Bi contaminants in the scintillator are in progress. The observed reduction of background is already sizeable and it is marking the beginning of a new phase of precision solar neutrino spectroscopy with an increased sensitivity to the more elusive components of solar neutrino flux like pep and CNO neutrinos.",
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AU - Machulin, I.

AU - Manecki, S.

AU - Maneschg, W.

AU - Manuzio, G.

AU - Meindl, Q.

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