Neutrino Definition and 390 Threads

I've been reading about the T2K experiment where a "neutrino beam" is being sent from the J-PARC accelertor in Takio to the Super-Kamiokande detector in Japan. So if neutrinos only interact weakly, how do they create a beam of them? At J-PARC they create them by firing high-energy protons at...

I just watched the movie 2012. Now I know it's just a movie and a bit of fantasy. What I want to know is, is there any type of radiation from the Sun that can penetrate a few miles into the Earth's crust and have some sort of effect on the rock down there. For example, can the amount of...

p ----> n + 2v where v = neutrino , tell me why the combination of a neutrino and anti neutrino is observed and how to expreimentally distinguish b/w neutrino and anti neutrino ? It is chargeless ,almost massless , is it related to the spin , how to make a neutrino interact with a target...

If we knew the four momentum of a neutrino should we then be in position to calculate whether the gravitational potential of our galaxy might "bind" that neutrino? Thank you for any thoughts.

I recently discovered that there is a possibility that neutrinos are their own antiparticles. However, I cannot see how lepton number could be conserved if this were so, can anyone help explain it to me? Thanks!

I was wondering if we could create a device that could interact with neutrinos and extract their energy to some considerable percentage, would this allow for an almost undirectional and free power source? I'm unable to do a rough estimate of the power per square meter as it seems tying to find...

How many neutrino emission mechanism, that causes the cooling of star, are there in neutron star? And How, what equation, to calculate the emissivity of each mechanism? thankfully, First

Can nuclear weapons explosion produce "neutrino pluse"? Can nuclear weapons explosion produce "neutrino pluse"?

I'm trying to understand the energy spectrum of neutrinos ejected from the sun. Any suggestions on a book that covers this aspect of beta+ decay? I'm just not sure how to treat the kinematics of a fusion reaction or decay- only collisions. Thanks.

I'm wondering if it will ever be possible to detect the cosmic neutrino background. I don't know all that much about neutrino detection, so I'd really like to hear some thoughts / speculations.

I'm a new grad student preparing to do some work on Daya Bay, and I'm basically taking in all the information on neutrinos that I can right now. It's pretty interesting stuff, but I was wondering if anyone has any thoughts on the following: Assuming I correctly understand that neutrino flavor...

Hello All, I have read that because the Neutrino has so little mass, and because it is not affected by the Electromagnetic Force that it can travel through light years of solid lead. The photon is also mass-less, I believe. Why can it not do the same as neutrinos? I understand the photon...

Hi, I have a question about this decay: \pi^- \rightarrow e^- \overline{\nu_e} there is a factor: 1 - \frac{v_e}{c} what are these values, v_e,c, and why this quantity is equal to: \frac{m^2_e}{m^2_\pi + m^2_e}? Thank you Ciccio

I was reading about the South Dakota Homestake Solar Neutrino detector and I have a question? What I am getting from reading about it is that, they detect solar neutrinos by looking for a neutrinos interaction with a (Cl) nucleus to make a radioactive (Ar) Nucleus. (Ar) is one atomic...

I have a question is it possible to make an engine that is powered by neutrinos? i read that neutrinos can change nuclei and that they can become protons so can that in any way be used to create a nuclear fusion reaction which in turn would power the device?? thank you guys for your help...

A historical question: The neutrino was proposed by Pauli in 1930/31 to solve the crisis caused by the continuous energy distribution of the beta rays (electrons). The neutron was not discovered until 1932. Was Pauli aware, or did he even suspect, at the time of his proposal, the violation of...

Wikipedia says that the phenomenon of Neutrino Oscillation implies that the neutrino has a non-zero mass (http://en.wikipedia.org/wiki/Neutrino_oscillation" ). Why is that? Why is it that Neutrino Oscillation can only exist, if neutrinos do have mass?

I have many doubts about neutrinos..can someone explain me? 1. All neutrinos and anti neutrinos have different masses..and if the neutrinos oscillate, how the difference in mass is justified? is there any violation of energy conservation? 2. If neutrinos which are leptons oscillate, then...

I don't really understand why neutrino oscillation occurs so I looked it up on wikipedia: http://en.wikipedia.org/wiki/Neutrino_oscillation I went to the "Theory, graphically" section and it gives quite a good explanation. However, there are a few details I don't get. It says: "This...

From a thread on “void theory vs. acceleration” (link in quote below); Rather than hijack the other thread for more detail on a side topic, I’ve opened this new thread. I’m interested in how science hopes to use “Neutrino observatories”. I’ve not seen much on the hopeful physics of making...

Homework Statement I'm lost at how to derive the probability of a neutrino species surviving an oscillation. After performing calculations, I can't seem to get it into the nice tidy form 1-\sin^{2}2\theta\sin^{2}\left(\frac{\Delta m^{2}t}{4p}\right) Homework Equations Whatev...

Regardless of the measured flux, is the expected neutrino flux from the sun greater or less than the expected flux from nuclear reactors? I don't know if I'm using the word flux correctly. I mean number of neutrinos per square meter per second on the surface of the earth.

Hi all. What is the difference between a neutrino and an antineutrino if they both have no charge and aren't made up of quarks? Thanks.

[Moderator's note: Quoted-printable stuff NOT corrected. Sometimes I correct small errors, but a) there are several here and b) it is not obvious what the meaning should be. Please submit only 100% 7-bit ASCII plain-text posts. Even if YOU can read something fancier, many readers can't...

One more question (I'm wary I'm totally spamming the forum!).. its in reference to the decay of Cr to V, see attached files. The decay is clearly beta plus decay. p->n+positron+antineutrino The question asks to determine the neutrino spectrum. Now the energy of the neutrino is simply...

I've been reading about this very fascinating experiments there and one thing I can't figure out--either from their literature or that from other places--is how they can be sure that the reactions producing the Cherenkov light are caused by *neutrinos*. That is, how do we know that it's...

Hi everyone, I have always been very worried about the possible consequences of neutrino masses. I just came accros a paper which I thought I would share with you. First, the reference : Neutrino mass and mixing implied by underground deficit of low energy muon-neutrino events John G...

Do the neutrino detectors measure only the number of events but not the energy of the detected neutrino?

Is it allowed? such as a electron neutrino and an electron anti-neutrino. And why? Now, I am confused... Thanks.

How many people remember the days of the birth of the www? I cut my teeth on Dr. Neutrino back in '96. It's only been 12 years, but seems like a lifetime.

If a neutrino is unaffected by EM and strong forces, and only interacts weakly, how is it possible to measure its spin? I don't mean measurement in a practical sense, as in looking at pion decay.. but how it could be measured in principle. I guess what I mean is are there any physical phenomena...

Homework Statement In some theory the electron neutrinos and the muon neutrinos mix like this: \mathcal{L}_{m} &= -\frac{1}{2}m\left(\overline{ \nu^{C}_{\mu\text{R}} }\nu_{\text{eL}} + \overline{ \nu^{C}_{\text{eR}} }\nu_{\mu\text{L}}\right) + \text{h.c.} Show that there exists a...

Because of the existence of sterile neutrino, how and why it gives effect on the big bang nucleosynthesis more than active-active neutrino oscillation. Its a question on behalf of my friend. thanks for any help

Homework Statement in the decay process, \pi ^{+} -> \mu^{+} + \nu_{\mu} show that for a neutrino of finite (but small) mass, compared with the case of the massless neutrino, the muon momentum would be reduced by the fraction: \frac{p'}{p}= - \frac{m_{\nu}^2...

With physicists building big neutrino detectors like IceCube and Anteras astrophysicists where hoping for a completely new way of seeing the universe. However the first results for neutrino astronomy coming the old Super Kamiokande labs, and from around 1500 neutrino in the TeV range, the've...

Homework Statement I have a questions on Neutrino Oscillations, but i have no idea how to solve any of it... this is just one part... How do I show that the probability of a mu neutrino having transformed into a tau neutrino at a time t is: sin^2(2theta)sin^2[((difference in masses...

I have a few questions about Neutrino Oscillations... Firstly, why are they called oscillations? Is it because they can go back and forth to different flavours/masses? Next, if, for example, a tau neutrino is produced in the sun, will it oscillate to the other flavours on its way to earth...

In the solar neutrino experiments, there were deficits in the observed solar neutrino flux when compared with the theoretical values. If i just focus on the Cl-37 and Ga-71 reactions to detect solar neutrinos, there is a question confuses me a lot. That is, from the result of experiment...

Why do only neutrino oscillates (showing massiveness of neutrino)? Why don't electron, muon and tau oscillates?

What exactly are neutrinos doing(their purpose)?

Does 1a type supernova release the same amount of neutrino as 2 type supernova?

I tried and I got a ridiculous large number for the neutrino mass. I basically used E=\gamma m c and then, for 10 MeV neutrinos, time taken is t + 10 seconds to reach Earth, for 50 MeV neutrinos, time taken is t seconds. Speed = \frac{100 000}{(t+10)} for 10 MeV and Speed = \frac{100 000}{t}...

Hi guys, I've been struggling with this problem for a while now and can't seem to get anywhere with it. Roughly speaking: We are given that an Ar37 atom decays through electron K capture into a Cl37 atom and a neutrino, plus a gamma ray of wavelength 4.2 Angstroms. The binding energy of...

Why does pions(coming through atmosphere) decays into a muon and a muon neutrino, not directly into electron and lelectron neutrino?I know it's because splin angular momentum conservation...but I need to be more clear about it.

The mass of sun is determined by measuring the distance of a planet from the sun,the speed of that planet around the sun ,and then using Newtons law of gravity.In the same fashion one can determine the distribution of mass in a galaxy by observing the position adn motion of the stars in that...

so does the Higg field give the neutrino mass, and can neutrino velocity change? how close to c is neutrino velocity?

People say that if neutrinos are Majorana particles, they are "identical to their anti particle". But anti neutrinos are obviously different from neutrinos. They produce anti-leptons rather than leptons in the scattering process. So the only difference I can image is the helicity, however that...

I put a notice of this earlier today in the QG links thread https://www.physicsforums.com/showpost.php?p=1134904&postcount=529 https://www.physicsforums.com/showthread.php?p=1134904#post1134904 This thread is in case anyone wishes to discuss the paper: http://arxiv.org/abs/hep-th/0610241...

hello everyone, what is the solar neutrino problem ?

Cosmic Neutrino Background... What was the temperature and age of the Universe, when it became 'transparent' to cosmic neutrinos? From what type of nuclear reaction did cosmic neutrinos originate? What is the peak temperature of cosmic neutrinos?