oscillation

A woman with a black shirt looks concerned and holds a banana in one hand. To the right of her, an illustration of a sun-like object that says "The Solar Neutrino Problem" in the middle of it. An illustration of three bananas is in the right-hand corner. Different flavors of neutrinos appear to come out of the sun-like object. Two electron neutrinos are in dark brown, other neutrinos are light in shade.

Throw on your shades: Today on #EvenBananas, we’re looking at particles from the sun — and how trillions of them went missing. Join Fermilab scientist Kirsty Duffy to explore how an experiment using 100,000 gallons of dry cleaning fluid a mile underground led to one of the biggest mysteries in particle physics: the solar neutrino problem.

NOvA scientists have seen evidence that one of the three neutrino mass states might not include equal parts of muon and tau flavor, as previously thought. Scientists refer to this as “nonmaximal mixing,” and NOvA’s result is the first hint that this may be the case for the third mass state.

NOvA announces its first cross section measurement, the probability than an electron neutrino interacts with the protons and neutrons inside the NOvA near detector. The measurement draws on the largest data set in the electron neutrino energy region from 1 GeV to 3 GeV.

NOvA takes a first measurement of disappearances of muon type neutrinos as they oscillate away. Where NOvA would expect to see 201 muon neutrinos if there were no oscillations, they actually see only 33 — clear evidence of oscillations.