Neutrino¶

Neutrino is one of the most interesting particles in our world. The first proposal of such a new particle was given by Pauli. He managed to explain the spectrum of beta decay. In 1956, neutrinos was first detected in Cowan–Reines neutrino experiment. [1] Later on a lot of neutrino experiments have been carried out.

Solar Neutrino Problem

The sun produce neutrinos inside it and the neutrinos propagate out. On the earth we can detect them. The problem was that the detected neutrinos was only one third of the total neutrino flux predicted which causes some people to think that the solar had shut down. The solution, however, is the neutrino oscillation.

As far as we know, we have three flavours of neutrinos and their anti particles and they are orthogonal to each other,

$\braket{\nu_{l'}}{\nu_l} &= \delta_{l'l} \\ \braket{\bar\nu_{l'}}{\bar\nu_l} &= \delta_{l'l} \\ \braket{\bar\nu_{l'}}{\nu_l} &= 0.$

The interesting thing about neutrinos is that it oscillates.

Table of Contents:

Questions¶

Question

Is neutrino its own antiparticle? Or is neutrino Majorana or dirac?

Question

What’s the mass hierarchy?

Question

What are the mixing angles?

Question

How many different flavours of neutrinos?

Definition¶

$\Delta &= \sqrt{2} G_F n(x) \\ \omega &= \frac{\Delta m^2}{2E}$

Support¶

DOI¶

Footnote¶

[1]	Cowan–Reines neutrino experiment