I am not sure if this has been asked recently, but has there been any headway into solving the solar neutrino problem? I recently completed the Particle Physics for non-Physicists by Professor Stephen Pollack. It is from 2006 and I was wondering if the issue had been solved yet.
In it he stated that 66% of the expected neutrinos were being detected. He postulated that the neutrinos could possibly oscillate between types. However wouldn't a tau neutrino and muon neutrino be detected as well?