Direct Measurement of the {sup 7}Be Solar Neutrino Flux with 192 Days of Borexino Data

Journal Article · Fri Aug 29 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.091302· OSTI ID:21134170

Arpesella, C; Di Pietro, G; Monzani, M E ^[1]; Back, H O; Hardy, S; Joyce, M; Manecki, S; Raghavan, R S; Rountree, D; Vogelaar, R B ^[2]; Balata, M; Di Credico, A; Gazzana, S; Korga, G; Laubenstein, M; Orsini, M; Papp, L; Razeto, A; Tartaglia, R ^[1]; Bellini, G ^[3]

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1. INFN Laboratori Nazionali del Gran Sasso, SS 17 bis Km 18-910, 67010 Assergi (Italy)
2. Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (United States)
3. Dipartimento di Fisica, Universita degli Studi e INFN, 20133 Milano (Italy)

We report the direct measurement of the {sup 7}Be solar neutrino signal rate performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The interaction rate of the 0.862 MeV {sup 7}Be neutrinos is 49{+-}3{sub stat}{+-}4{sub syst} counts/(day{center_dot}100 ton). The hypothesis of no oscillation for {sup 7}Be solar neutrinos is inconsistent with our measurement at the 4{sigma} C.L. Our result is the first direct measurement of the survival probability for solar {nu}{sub e} in the transition region between matter-enhanced and vacuum-driven oscillations. The measurement improves the experimental determination of the flux of {sup 7}Be, pp, and CNO solar {nu}{sub e}, and the limit on the effective neutrino magnetic moment using solar neutrinos.

• OSTI ID: 21134170
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BERYLLIUM 7
ELECTRON NEUTRINOS
KEV RANGE 100-1000
MAGNETIC MOMENTS
NEUTRINO OSCILLATION
PROBABILITY
SIGNALS
SOLAR NEUTRINOS