Neutrinos are light, uncharged leptons. The neutrino tag should be applied to question relating to neutrino properties or interactions involving neutrinos.

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Neutrinos and DNA

This is a question which bridges the gap between biology and physics... but I thought this was the best place to ask it. I remember reading a while ago that it is thought that neutrinos may play a ...
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Is a DIY neutrino detector feasible?

How long does a neutrino detector filled with distilled water need to be to pick up neutrinos from one direction at about the level of a distant star within our galaxy? Would an off the shelf ...
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Why neutrinos are weakly interacting? [duplicate]

I recently attended a talk on neutrinos, where the speaker said there are billions of neutrinos passes through our body every second, but in our lifetime the probability of alteast one neutrino ...
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1answer
40 views

Where do astrophysical neutrinos come from?

What I really do not get about them is collisions of cosmic rays with light produces high energy neutrinoes but cosmic rays have a little energy maybe less than a 5000 electron volt. How do high ...
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Would a neutrino bomb do anything? Or can weak force kill you?

In a disreputable animated cartoon (I accidentally watch every episode of religiously), a mad scientist plans on killing all humans with a Neutrino bomb. From context, this is a bomb that produces a ...
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1answer
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Derivative coupling of neutrinos to massless Goldstone boson - calculation of decay width

I have a theory with a derivative coupling of neutrinos $\nu_{i,j}$ to a massless Goldstone boson $\phi$: \begin{equation} g_{ij}\partial^\mu \phi_\mu\bar{\nu_i}\nu_j. \end{equation} Now I want to ...
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75 views

How many neutrinos would it take to accelerate a 75kg human? [closed]

Assume that you have somehow creates a neutrino emitter that does not release any heat or light–just a lot of neutrinos. You weigh 75kg, and step right into the flow of the emitter. How many ...
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2answers
54 views

Are charges absolute or relative?

The charge of a particle is (mostly) an intrinsic property of the particle. One of the few elementary particles that doesn't have a charge are neutrino's. Does that mean that it is still possible ...
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Is a deviation from the equal flavor ratio of neutrinos ruled out experimentally?

Neutrinos have a lifetime which exceeds the lifetime of our universe. Therefore we measure an equal ratio of all three neutrino flavors, 1:1:1. However, lets assume that the heavier neutrinos can ...
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1answer
48 views

Can neutrinos cause $^{14}\rm C\to\,^{14} N$ beta-decay?

I half-heard in a lecture that radiocarbon beta-decay is caused by neutrinos passing close to the nuclei & weakly interacting with one of the carbon neutrons, flipping it to a proton and producing ...
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zee model of radiative neutrino mass

Without computing the expression for radiatively generated neutrino mass matrix $M_{\alpha\beta}$, in Zee model, is it possible to guess that the diagonal elements of the mass matrix vanishes? I ...
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2answers
136 views

Is it possible to go faster than the speed of light in vacuum?

If it is possible for particles to go faster than the speed of light in certain events, would it be possible to create a situation in which the barrier of the speed of light can be crossed?
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I need Resources on CMB Neutrinos

I am doing a research paper for upper level undergrad class on CMB neutrinos (C$\nu$B). I need papers that explain CMB Neutrinos from the ground up like the main theory behind the CMB Neutrinos and ...
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2answers
32 views

In typical decay experiments what range of energies do electron neutrinos and muon neutrinos exhibit?

in experiments over decay of particles, what are the typical range of energies of electron neutrinos and muon neutrinos? I would guess I need to specify in the inertial frame of a lab here on earth? ...
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1answer
45 views

Do muon neutrinos have more energy than electron neutrinos?

I saw an answer to "how to identify a muon neutrino and electron neutrino" as being "Weak interaction conserve not only the global lepton number, but the lepton flavor numbers as well. And that is ...
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1answer
39 views

What is the gravitational power that neutrinos created in the big bang exert on us?

I was thinking about the big bang, and I remembered that neutrinos not only travel at the speed of light, but they were also created in massive quantities very early in the universe (Hadron epoch). ...
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Do neutrinos get their mass via interacting with the Higgs Boson? [duplicate]

Do neutrinos follow the Standard Model and get their mass via the Higgs Mechanism or we still don't know about the origin of their mass as neutrinos with mass are beyond the Standard Model?
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66 views

Negative Mass Square

I'm reading a book about neutrino physics (from 1997). In the chapter about neutrino mass they list results of certain experiments. All of them get a negative value for $m(\nu_e)^2$ but a positive one ...
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How to understand particle decoupling in the early universe?

We often say that when the rate of some interactions, say the beta decay and electron capture, are slower that the rate of universe's expansion, then the corresponding particles, say neutrinos, ...
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Can the Higgs mechanism provide complex masses for quarks and neutrinos?

Can the Higgs mechanism give complex masses to quarks and neutrinos, or is only real mass generation possible? There exist complex phases in the CKM and PMNS matrices, can they be explained through ...
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Can both types of W boson be responsible for a neutron-neutrino interaction?

My textbooks lists the exchange particle for a neutron-neutrino interaction as being the W- boson. Is this the only option, or can it also be a W+ boson? Nothing jumps out at me that would suggest it ...
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1answer
40 views

Do neutrinos ever turn back to something less ghostly?

The most notable source of neutrinos seems to be the Sun. Obviously, the neutrinos are created from something else. Now as I think of it, they can just fly away through the solar system and be gone. ...
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1answer
33 views

Neutrino oscillation and mass [closed]

Neutrino oscillations indicate that neutrino have little bit mass. Among three neutrinos - electron, muon and tau neutrino - which is heavier? What is the mass range of these neutrino?
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Sterile neutrino constraints (summary of results)

Constraints on sterile neutrinos come from an amazingly wide range of different sources. From astrophysical observations (review1, review2) to particle physics experiments (MiniBooNE, Daya Bay, LSND, ...
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Is neutrino in superposition state else how does it knows when to change flavor?

Is the neutrino being in all 3 flavors at the same time until observed if not how does it know when to alter its mass and become another flavor?
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Does the uncertainty principle imply the existence of particles that exceed the speed of light?

The uncertainty principle allows for the creation of virtual particles (with non-zero mass) that exist for very short durations. This allows empty space to have particle pairs that pop into existence ...
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2answers
213 views

Has neutrino redshift been observed?

I understand that neutrinos are emitted when supernova explode. I presume that there are quite accurate models that predict the energies of those neutrinos at the time of emission. Has the phenomenon ...
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86 views

What is the bigger number of particles crossing an area: the number of photons or the number of neutrinos? [closed]

Take an squared area with (10²)² m² in front of the sun. What is the bigger number of particles crossing an area: the number of photons or the number of neutrinos? Just for clarification: you can ...
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28 views

Anomalies, neutrino condensate and neutrino masses

Is neutrino number conservation not affected by the U(1) QCD and QED anomalies due its zero U(1) charge? Is this the reason why the neutrino should be massless and there should be no lepton family ...
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Chiral anomaly and fermion number conservation

Chiral anomalies in QED and QCD violate fermion number conservation, since a U(1) vector symmetry corresponds to fermion number conservation. However, only the LH and RH fermion numbers are not ...
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Can we create sheet of neutron

I want to know are there any theory or technology to create a neutron matter like neutron star on earth. Even a tiny thin sheet like graphene And how heavy it is if we create 1x1 sqmm of neutron ...
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1answer
101 views

Quark mixing vs neutrino mixing, mass eigenstates, weak states and detection

I have some doubts regarding the CKM matrix in the quark sector and PMNS matrix in the leptonic sector. Let us call $(d^\prime, s^\prime, b^\prime)$ the weak basis for quarks and $(d,s,b)$ the mass ...
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2answers
181 views

Nobel Prize challenge: Could neutrinos be used for quantum information processing?

We know that two scientists, Takaaki Kajita and Arthur B. McDonald, working on Neutrinos have just been awarded the 2015 Nobel Prize in Physics. My question as a Nobel Prize Challenge Question is: ...
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Physics behind this neutrino-related joke

In the comment section of a newspaper article reporting on the 2015 Nobel Prize for Physics, which was awarded for work on neutrino oscillation, I found the following joke: "I'm sorry, we do not ...
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Can the newly discovered mass of the neutrino explain in part, the missing matter [duplicate]

This question is related to the recent discovery of the neutrino mass 0.320 ± 0.081 eV/$c^2$. Could this account for at least some of the Dark Matter/Missing matter of the universe?
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Neutrinos and global $U(1)$ symmetry of Weyl fields

My book on QFT says that neutrinos are well described by left-handed Weyl spinor. The classical Lorentz-invariant Lagrangian density for that field is: $$ \mathcal{L} = ...
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Time evolution operator acting on a non-eigenket

I'm taking a course in QM at my university, and I'm trying to work out an assignment given to the class by our professor. The setup is as follows: The problem is about a simplified description of ...
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Does the neutrino have charge? Obviously not!

I was recently reading "Particle Physics: A Very Short Introduction" by Oxford University Press, and in it (I haven't finished it yet though) he says, "The weak force changes one variety of ...
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What is the product of low energy neutrino annihilation?

Since neutrinos are only subjected to weak interaction(ignore gravitation), thus the interaction of neutrinos are only governed by Z bosons, and photon is unlikely produced. If two neutrinos ...
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Is a blackhole just a neutrino with much more mass?

If there was a blackhole that had a mass similar to that of a neutrino ($0.320 ± 0.081\,\mathrm{eV/c^2}$), would we still be able to differentiate the blackhole from the neutrino? Is there any ...
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In what ways does the sun output energy?

I'm curious about the energy output of the sun, and how it breaks down. What fraction is from EM radiation, solar wind, neutrinos, et cetera? How does energy output vary over the EM spectrum? I was ...
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Is the right-handed antineutrino the CPT conjugate of the left-handed neutrino?

I am working from the book Massive Neutrinos in Physics and Astrophysics by Mohapatra and Pal (which is available here). On page 66, the authors claim that $\psi_{L}$ is the $\mathcal{CPT}$ conjugate ...
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Earth density distribution from shooting neutrinos?

I am interested in possibility of inferring Earth interior structure from gravitational data. As classical calculus problem shows, it is impossible to understand non-uniform density distribution ...
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189 views

What type of neutrinos do we detect

There are three types of neutrinos known today. When detecting them, how can we tell which type we are detecting?
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What is the analogous effect of cosmological redshift for particles with mass?

Due to the metric expansion of space, light emitted from earlier times in faraway parts of the universe and travels for a long time to reach us get progressively redshifted, decreasing the energy of ...
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101 views

Is neutrino-based communication possible?

Referring to this article, where we see there are three flavors of neutrinos, got me thinking of simple binary-based communication, but more like the UDP protocol where we can live with dropped ...
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Neutrinos have mass. But how much mass?

Can somebody explain to me how much mass neutrinos have. According to my understanding neutrinos oscillate, therefore they should have some mass. If this is right then how much mass do they have?
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1answer
64 views

Current constraints on lightest neutrino mass?

This paper from 2005 claims that the mass of the lightest neutrino is unconstrained. (see p9) Oscillations are only able to constrain the differences in squares as far as I know, but perhaps ...
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1answer
70 views

Are Fermi-Dirac-statistics relevant to view the universal system of neutrinos?

Should the energy distribution of neutrinos be affected by Fermi-Dirac statistics? And if so, what would the consequences be? Could this locally cause weak interaction because of the Pauli Exclusion ...
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Is it experimentally verified that the neutrinos are affected by gravity?

If neutrinos (or any other particles) wasn't affected by gravity that would contradict the general theory of relativity. I'm convinced that the postulate of the equivalence between inertial mass and ...