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October 31, 2018 to November 4, 2018
UBC Robson Square
America/Vancouver timezone

Update on the $hep$ solar neutrino limit from the three-phase SNO dataset

Nov 1, 2018, 6:00 PM
Room C215 (UBC Robson Square)

Room C215

UBC Robson Square


Dr Karin Gilje (University of Alberta)


The spectrum of solar neutrinos from the $pp$ chain has been studied in depth by a variety of underground detectors. However, neutrinos from the $hep$ reaction (${}^3$He $+$ $p^+$ $\rightarrow$ ${}^4$He $+$ $e^+$ + $\nu_e$) remain unobserved due to the small theoretical branching ratio ($2\times10^{−7}$ per $pp$ termination). The SNO detector has a unique sensitivity to neutrino energies above the ${}^8$B spectrum endpoint (~15 MeV) through the $hep$ spectrum endpoint (~18.8 MeV) due to the charged current interaction on deuterium, which allows a more precise extraction of the underlying neutrino energy spectrum. The SNO collaboration previously published a world-leading limit in 2006 only using the first heavy water phase with 306.4 days of data. An updated status report on the analysis of the $hep$ neutrino spectrum from all three phases of SNO (1170.2 days) will be presented in this poster.

Primary author

Dr Karin Gilje (University of Alberta)


Dr Andy Mastbaum (University of Chicago)

Presentation materials