Physics Help Forum Majorana Neutrino

 Nuclear and Particle Physics Nuclear and Particle Physics Help Forum

 Jan 19th 2019, 10:31 AM #1 Forum Admin     Join Date: Apr 2008 Location: On the dance floor, baby! Posts: 2,857 Majorana Neutrino 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. Does anyone have any (solid) information about this? Thanks! -Dan __________________ Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup. See the forum rules here.
Jan 21st 2019, 02:12 AM   #2
Senior Member

Join Date: Oct 2017
Location: Glasgow
Posts: 474
 Originally Posted by topsquark 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. Does anyone have any (solid) information about this? 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.

 Jan 21st 2019, 03:16 AM #3 Senior Member     Join Date: Jun 2016 Location: England Posts: 1,069 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. topsquark likes this. __________________ ~\o/~
 May 12th 2019, 11:46 AM #4 Senior Member   Join Date: Mar 2019 Location: cosmos Posts: 666 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...
May 13th 2019, 02:11 AM   #5
Senior Member

Join Date: Oct 2017
Location: Glasgow
Posts: 474
 Originally Posted by neila9876 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!

 May 13th 2019, 02:26 AM #6 Senior Member   Join Date: Mar 2019 Location: cosmos Posts: 666 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?
May 13th 2019, 03:01 AM   #7
Senior Member

Join Date: Oct 2017
Location: Glasgow
Posts: 474
 Originally Posted by neila9876 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.

 May 13th 2019, 03:31 AM #8 Senior Member   Join Date: Mar 2019 Location: cosmos Posts: 666 neutral vs neutral Neutral guys have two different characters? Interesting?
May 13th 2019, 05:51 AM   #9
Senior Member

Join Date: Oct 2017
Location: Glasgow
Posts: 474
 Originally Posted by neila9876 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.

 May 13th 2019, 07:01 AM #10 Senior Member   Join Date: Mar 2019 Location: cosmos Posts: 666 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?

 Tags majorana, neutrino