However, no beta particle is emitted, but only an electron neutrino.

By interacting with the geological layers, electron neutrinos that had changed flavor inside the Sun would be converted back again.

This means that during weak interactions, electron neutrinos behave like electrons.

The neutrinos produced by the Sun are all electron neutrinos.

The flavor seen first was the electron neutrino, which interacts only with electrons.

The effect is important at the very large electron densities of the Sun where electron neutrinos are produced.

The part of the detector that measures electron neutrinos alone looks for their impacts on heavy-hydrogen atoms.

But what are the conditions under which electron neutrinos from the Sun undergo this curious transformation?

Would the collision produce electron neutrinos or even the Higgs boson?

For example, the data show that within 5% confidence, the rest mass of the electron neutrino is at most 16 eV.