All Questions
23 questions
0
votes
0
answers
68
views
Neutrino Mass from Tritium
I just read: Researchers close in on the elusive neutrino (phys.org)
However, I think I'm missing something. The basic argument appears to be:
(decay process)
Tritium -> Helium-3 + β− (electron) +...
- 113
0
votes
3
answers
931
views
Can photons turn into neutrinos, similar to 'pair production' of electrons and positrons?
Since neutrinos ate much lighter, and are their own antiparticles (Majorana), it should be much 'easier' than turning a photon into an electron-positron pair, correct?
- 4,709
1
vote
1
answer
91
views
Why is the spectrometer so big in KATRIN experiment?
I've been studying KATRIN experiment for a popularizing science project and I was wondering, why is the spectrometer so big ? I mean the thing is so huge that they had to carry it over 8000km on the ...
- 21
11
votes
3
answers
2k
views
Does the Electric Field Instantaneously vanish during an Electron Capture?
When an Electron Capture occurs a Neutron and a Neutrino are formed. Prior to this process due to the presence of the proton and electron an electric field must've existed however as soon as this ...
- 807
0
votes
0
answers
30
views
What is neutrino pair exchange? Can neutrino pair exchange deduce stronger-than-electromagnetic attractive forces between electrons?
I read recently about neutrino pair exchange. What is neutrino pair exchange? Can this exchange induce forces stronger than electromagnetic forces between electrons which in turn form attractive ...
- 557
-2
votes
2
answers
504
views
Beta ray maximum energy
I recently participated in a classical experiment that can calculate the maximum energy of a beta radiation emission (for Tl-204). When I searched the internet for other results for comparison, I ...
- 157
0
votes
1
answer
161
views
How would a monochromatic line in the $\beta$-decay spectrum neglect the existence of neutrinos?
When reading about the history of the discovery of the neutrino I came across the following paragraphs in my lecturer's notes:
(...) physicists were puzzled by the continuous spectrum of $\beta$-...
- 759
1
vote
2
answers
787
views
Neutrino "turns into" an electron?
Here: http://www.physics.usyd.edu.au/hienergy/index.php/Why_neutrinos_%22go_through_anything_and_everything%22
it mentions neutrinos turning into an electron. I also read that neutrinos are far less ...
- 2,288
12
votes
2
answers
6k
views
What is the difference between a neutrino and an electron neutrino?
So, what is the difference between a neutrino and an electron neutrino? Like how does the term 'electron' made a difference? Also, what is the difference between an antineutrino and an electron ...
- 876
1
vote
3
answers
2k
views
Electron density in the Sun
I'm currently working on solar neutrino and in order to make a numerical simulation, I need the potential felt by electron-neutrino :
\begin{equation}
V_e(r) = \sqrt{2} G_F N_e(r)
\end{equation}
where ...
- 75
27
votes
3
answers
6k
views
Can neutrinos "hit" electrons?
I understand that particles interact via the fundamentals forces of nature. For example photons interact with matter because they carry the change in the electromagnetic field. Neutrinos, on the other ...
- 1,036
3
votes
2
answers
797
views
What happens to the electron in a beta minus decay?
We know that in a beta minus decay the neutron decays into a proton, electron and electron antineutrino. So let's assume we have a vacuum chamber full of free neutrons which after sometime decay in to ...
- 1,923
1
vote
1
answer
116
views
Can the Mikheyev-Smirnov-Wolfenstein (MSW) effect be modified by non-standard neutrino-neutrino interactions?
The MSW effect describes how propagation of neutrinos through matter can resonantly enhance the neutrino mixing. The reason for this enhancement is that the presence of electrons in matter changes the ...
- 1,803
2
votes
0
answers
104
views
Did electrons, right after the big bang, all had the same handedness (like all neutrinos are lefthanded)?
It is known that all neutrinos are lefthanded (for simplicity I don't discriminate between the technicalities of handedness and helicity), though in the answers of this question one can read that the ...
1
vote
0
answers
91
views
Why can't weak interaction bind neutrino and electron together? [duplicate]
According to wiki, unlike the other three interactions, weak interaction does not produce bound states. However, according to this and this, the weak force should be attractive between particles with ...
- 71
2
votes
1
answer
277
views
Questions about subnuclear decay: helicity and parity.
I read that the process (where the last is the antineutrino of electron): $$ \pi^{-} \Rightarrow e^{-} + \hat{\nu}$$
is disadvantage because of spins and parity argumentations, but why? In the 99% ...
0
votes
1
answer
146
views
Do electrons or neutrinos really have gravity fields?
Although they are very small, they are assumed to have gravity fields, because they have mass. But is this demonstrably true? I'd think that the field would be too small to measure with any existing ...
- 2,645
0
votes
0
answers
239
views
How does an electron interact with an electron neutrino?
An electron and neutrino come close and they exchange a W boson and then they change places.. but why? A neutrino has no electric charge, so how do they know to interact?
user86072
115
votes
4
answers
16k
views
Why do electrons, according to my textbook, exist forever?
Does that mean that electrons are infinitely stable? The neutrinos of the three leptons are also listed as having a mean lifespan of infinity.
- 1,968
0
votes
3
answers
723
views
Which particles can go right through the atom?
Can elementary particles (like the electron, photon, or neutrino ) go through an atom (not the nucleus)?
- 247
1
vote
1
answer
553
views
How to know electron and muon neutrinos are different except measuring mass
Before the discovery of neutrino mass, how did people aware electron and muon neutrinos are different?
- 6,451
0
votes
0
answers
84
views
Why aren't there more than three generations of the leptons and quarks? [duplicate]
There are three generations of electrons, neutrinos, and quarks. The second and third generations of electrons and quarks are unstable and decay into lighter particles.
Why are there exactly three ...
- 451
11
votes
1
answer
670
views
Are oscillations of electron chirality experimentally observable?
Is there any plausible experiment by which chirality oscillations in electrons could be observed experimentally, such as through some analogy to neutrino oscillation experiments?
- 22.2k