2011/06/30 by KamLAND Collaboration, S. Abe, K. Furuno +89 · 3 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Flux (metallurgy) #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Solar neutrino #astro-ph.SR #hep-ex #nucl-ex
paper · pdf · doi:10.1103/physrevc.84.035804
6 pages, 3 figures
arxiv created 2011/08/25 · openalex publication_date 2011/09/13 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We report a measurement of the neutrino-electron elastic scattering rate from 8B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5-MeV analysis threshold is 1.49 \ifmmode±\else\textpm\fi 0.14(stat) \ifmmode±\else\textpm\fi 0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a 8B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77 \ifmmode±\else\textpm\fi 0.26(stat) \ifmmode±\else\textpm\fi 0.32(syst) \ifmmode×\else\texttimes\fi106 cm^\ensuremath-2s^\ensuremath-1. The analysis threshold is driven by 208Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic 11Be. The measured rate is consistent with existing measurements and with standard solar model predictions which include matter-enhanced neutrino oscillation.