# Majorana Neutrino

#### topsquark

Forum Staff
I heard about a year ago that a the neutrino is actually a Majorana particle (a fermion that is its own anti-particle). It's a big deal because it would be a major step (no pun intended!) to prove that Supersymmetry is a symmetry of nature. It's hard to even measure anything about neutrinos and so this is a very big deal.

But I haven't heard anything since. Even with Google the topic is hard to research and I don't suppose I'd have much luck with ArXiv since the paper would be a year old.

Thanks!

-Dan

#### benit13

I heard about a year ago that a the neutrino is actually a Majorana particle (a fermion that is its own anti-particle). It's a big deal because it would be a major step (no pun intended!) to prove that Supersymmetry is a symmetry of nature. It's hard to even measure anything about neutrinos and so this is a very big deal.

But I haven't heard anything since. Even with Google the topic is hard to research and I don't suppose I'd have much luck with ArXiv since the paper would be a year old.

Thanks!

-Dan
Unfortunately not. I was aware that there were papers hypothesizing them, but I haven't really kept up to date with the literature these days... there's so much of it and I no longer work for a University, so paywalls often bar me from the articles I want to see.

1 person

#### Woody

It is difficult to get any solid information on neutrinos,
they are such slippery little ...

I also saw the conjecture, perhaps a year or so ago (in a New Scientist article).
But nothing since.

1 person

#### neila9876

cryptic vs simple

I don't know why people consider so cryptic the neutrino is. I consider it very simple from the physical (structure) angle. Yes, its anti - particle is just itself. "Supersymmetry"...? wo,,,another super - fashion word...

#### benit13

I don't know why people consider so cryptic the neutrino is. I consider it very simple from the physical (structure) angle. Yes, its anti - particle is just itself. "Supersymmetry"...? wo,,,another super - fashion word...
They are extremely hard to detect. There are also phenomena specific to neutrinos, such as neutrino oscillation (aka neutrino mixing). We have a lot of information on the neutrino now, but only through a lot of hard work!

#### neila9876

What does "hard work" mean in physics? Just to find out some phenomina?
Why neutron can be relatively easy to be blocked while neutrino not? More hard work? 10 years more blinded exploration?

#### benit13

What does "hard work" mean in physics?
Lots of money and time (as well as clever people trying to actually to perform the research).

Just to find out some phenomina?
Yes. Detecting neutrinos requires giant chambers filled with chlorine and hundreds of well-maintained photodetectors. Detecting neutrinos is difficult.

Why neutron can be relatively easy to be blocked while neutrino not? More hard work? 10 years more blinded exploration?
The neutrino only interacts with other matter via the weak interaction, which has very, very small interaction probabilities. Consequently, the fluxes of neutrinos going into a detector must be extremely high or, alternatively, for a fixed flux of neutrinos, the detectors must be very sensitive. In this latter scenario, a lot of background noise must be eliminated.

Neutrons can interact with other matter using the strong interaction (like protons, mesons and $$\displaystyle \alpha$$-particles), so the amount of effort required to get an interaction and measure it is less challenging than the neutrino. That said, they are neutral particles, so they cannot be controlled with magnets, making them harder to work with than protons or electrons.

2 people

#### neila9876

neutral vs neutral

Neutral guys have two different characters? Interesting?

#### benit13

Neutral guys have two different characters? Interesting?
Of course! There's a lot more to particles than just mass and charge. You should look up the "particle zoo" and the standard model of particle physics. There's some good text books on the topic.

#### neila9876

pig to pig

When people draw a front piture for a pig, they have to draw the eyes, the eyebrows, the nose with two holes, the mouth, the teeth, the big ears. When people draw a side profile for a pig, they only need to draw a long nose.
Make clear the very classic concept: charges. Why electron carry the same opposite charge as the proton, why the volume of charge does not change following the movement of paticles...before going deep into nuclei, "standard ***"...Is there a "standard ***" for electron too?