Ric Werme

Neutrinos are weird. IIRC, supernovae suggest they travel at the speed of light which requires they be massless. OTOH, the concern about the low neutrino flux from the sun was resolved when people found neutrinos changed to a different type, but that requires they don't travel at light speed and that they have mass.

https://neutrinos.fnal.gov/sources/solar-neutrinos/

The breakthrough came with data from two newer experiments. Super-Kamiokande, an improved version of the Kamiokande experiment, began observations in 1996, and the Sudbury Neutrino Observatory in Canada joined in 1999. Leaders of these two projects would go on to receive the 2015 Nobel Prize in physics for discovering the solution to the solar neutrino problem: neutrino oscillations. Roughly two-thirds of the electron neutrinos coming from the sun were changing their flavor as they traveled, arriving as muon or tau neutrinos. Evidence that neutrinos changed type also proved that they have mass, a shocking discovery not predicted by the Standard Model.

Posted by: Timothy Birdnow at 11:24 AM | No Comments | Add Comment
Post contains 163 words, total size 1 kb.