The rate of neutrino-electron elastic scattering interactions from 862 keV Be7 solar neutrinos in Borexino is determined to be 46.0±1.5(stat)+1.5−1.6(syst) counts/(day⋅100  ton). This corresponds to a νe-equivalent Be7 solar neutrino flux of (3.10±0.15)×10+9  cm−2 s−1 and, under the assumption of νe transition to other active neutrino flavours, yields an electron neutrino survival probability of 0.51±0.07 at 862 keV. The no flavor change hypothesis is ruled out at 5.0 σ. A global solar neutrino analysis with free fluxes determines Φpp=6.06+0.02−0.06×1010  cm−2 s−1 and ΦCNO<1.3×10+9  cm−2 s−1 (95% C.L.). These results significantly improve the precision with which the Mikheyev-Smirnov-Wolfenstein large mixing angle neutrino oscillation model is experimentally tested at low energy.

Precision measurement of the 7Be solar neutrino interaction rate in Borexino

ORTICA, Fausto;ROMANI, Aldo;
2011

Abstract

The rate of neutrino-electron elastic scattering interactions from 862 keV Be7 solar neutrinos in Borexino is determined to be 46.0±1.5(stat)+1.5−1.6(syst) counts/(day⋅100  ton). This corresponds to a νe-equivalent Be7 solar neutrino flux of (3.10±0.15)×10+9  cm−2 s−1 and, under the assumption of νe transition to other active neutrino flavours, yields an electron neutrino survival probability of 0.51±0.07 at 862 keV. The no flavor change hypothesis is ruled out at 5.0 σ. A global solar neutrino analysis with free fluxes determines Φpp=6.06+0.02−0.06×1010  cm−2 s−1 and ΦCNO<1.3×10+9  cm−2 s−1 (95% C.L.). These results significantly improve the precision with which the Mikheyev-Smirnov-Wolfenstein large mixing angle neutrino oscillation model is experimentally tested at low energy.
2011
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/290095
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 485
  • ???jsp.display-item.citation.isi??? 431
social impact