00:01
In this question, we're going to talk about why there's evidence for neutrinos having a non -zero mass.
00:08
So up until about 1998, it was assumed that the mass of the neutrino was just zero.
00:21
It was just totally massless.
00:25
Then in 1998, so prior to 1998, then in 1998, then in 1998, there was an experience.
00:35
Done at the super kamilkande neutrino detector.
00:50
So this is a japanese neutrino detector and they were able to see that the weak interaction, so through the weak interaction, there is a process by which neutrinos can convert between types.
01:12
So for instance, an electron nutrient can turn into a muon neutrino and into a tau neutrino.
01:24
And we call this process neutrino oscillation.
01:31
Basically, it oscillates between the different types.
01:37
Neutrino oscillates...