Direct Measurement of the {sup 7}Be Solar Neutrino Flux with 192 Days of Borexino Data
- INFN Laboratori Nazionali del Gran Sasso, SS 17 bis Km 18-910, 67010 Assergi (Italy)
- Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (United States)
- 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, Vol. 101, Issue 9; Other Information: DOI: 10.1103/PhysRevLett.101.091302; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). Borexino Collaboration; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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