All Questions
21 questions
27
votes
1
answer
534
views
The transit of Venus and solar neutrino rates
The following question was posed at the end of Maury Goodman's June 2012 long-baseline neutrino newsletter.
During the Venus transit of the sun, were more solar neutrinos
absorbed in Venus, or ...
20
votes
2
answers
7k
views
Sun light takes 1,000/30,000/100,000/170,000/1,000,000 years bouncing around inside to then reach the Earth
When light (photon particle) is generated inside the Sun, it takes a long time to bounce around inside to later escape and travel outwards.
Neutrinos escape immediately.
The numbers for the years ...
- 548
8
votes
4
answers
6k
views
How do neutrinos pass through the sun so quickly?
If it takes thousands of years for light to escape our sun then how can neutrinos generated in the very center of the sun reach earth in just 8 minutes? Why is their speed so great that they can ...
- 835
8
votes
2
answers
128
views
What is the composition of the universe's population of neutrinos?
I believe earth-based detectors measure mainly solar neutrinos, which have energies on the MeV scale of nuclear physics, are directed from the sun, and have flavors determined by the sun's nuclear ...
user4552
4
votes
2
answers
719
views
Are the muon/tau neutrinos produced in the Sun? If not, then where?
I was reading about Solar Neutrinos, and apparently they are all Electron Neutrinos.
However, there are two other types of neutrinos, the Muon and Tau Neutrinos. Does the Sun produce them? If not, ...
- 704
4
votes
1
answer
150
views
Is it proven that all "solar" neutrinos are coming from the Sun direction?
In "Observation of 8B solar neutrinos in the Kamiokande-II detector" (Phys.Rev.Lett., 63, 16(1989), http://prl.aps.org/pdf/PRL/v63/i1/p16_1) the Figure 2 shows that only small percentage of registered ...
- 41
3
votes
3
answers
354
views
Why don't the nuclear fusion processes inside the sun produce electron antineutrinos $(\bar\nu_e)$?
Why don't the nuclear fusion processes inside the sun produce $\bar\nu_e$ despite having the same mass as $\nu_e$? Is the reason as simple as "there is no production channel for $\bar\nu_e$s.&...
- 27.2k
3
votes
1
answer
296
views
Solar neutrino Spectrum - Why are there discrete energies for Be and pep?
What is the reason why some reactions give a continuum for the energy of the released neutrinos and others give only a discrete value ($\ ^7B$ and $pep$ )?
Thanks for your help. Please feel free to ...
- 653
3
votes
2
answers
160
views
Measuring the size of the core of the sun with multiple neutrino detectors
Back in 1998, researchers at the Super-Kamiokande neutrino detector released this image:
of the sun using their neutrino detector using approximately 500 days of data. This picture covered 90x90 ...
- 545
2
votes
2
answers
274
views
How do we exactly use neutrinos to probe the core of the Sun (if they can only interact weakly)?
Neutrinos are interacting with ordinary matter weakly. They pass through matter mostly unimpeded.
Thus, neutrinos typically pass through normal matter unimpeded and undetected.
Neutrinos' low ...
- 29.3k
1
vote
1
answer
525
views
Does a coronal mass ejection change solar neutrino emission rates?
Does the CME and neutrinos have any relation? CME is measured by Corona graphs.. How do they measure neutrinos coming from the sun? Does any of these have effects on earth's magnetic field or ...
anon
1
vote
1
answer
242
views
How many $pep$-related electron-neutrinos $\nu_e$ does the Sun produce?
In the sun neutrinos can be produced by the rare proton-electron-proton (pep) reaction:
$$ {}^1_1 H + e + {}^1_1 H \to {}^2_1 H + \nu_e $$
How many pep-related electron neutrinos does the Sun ...
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
1
vote
1
answer
252
views
Neutrino beam energy
Neutrino is one of the most mysterious particles in todays physics. Even when values of some parameters like for example mass associated with it are not known (or there is great range of possible ...
- 201
1
vote
0
answers
55
views
Solar neutrino deficit, 1/3 or 1/2?
The puzzle of the missing solar neutrinos is supposedly solved by neutrino oscillations. I understand the mechanism, but there is still one point which I find unclear.
For the energy range and ...
- 4,448
1
vote
1
answer
76
views
Reason for borexino pep flux confidence level error
At the TAUP conference in 2011, the Borexino collaboration presented an analysis of electron-neutrino elastic scattering events in their liquid scintillation detector to claim the first observation of ...
user148792
0
votes
2
answers
280
views
Solar Neutrino Problem [closed]
I am not sure if this has been asked recently, but has there been any headway into solving the solar neutrino problem? I recently completed the Particle Physics for non-Physicists by Professor ...
- 2,754
0
votes
1
answer
139
views
Solar neutrino spectrum: why are there two lines for beryllium?
I have a follow-up question to this one:
Solar neutrino Spectrum - Why are there discrete energies for Be and pep?
I understand why the lines for $^{7}\text{Be}$ and $pep$ are discrete, but why do we ...
- 65
0
votes
2
answers
126
views
Do neutrinos not interact with any kind of photons?
If billions of neutrinos reach us from the Sun why there is no any reflection of photons emitted from Earth to be reflected from them?
Is this they are not interacting at all?
- 1,835
-1
votes
1
answer
276
views
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 ...
- 124
-4
votes
1
answer
243
views
Hydrogen fusion in the Sun-neutrino
One of the ways nuclear fusion happens in the sun is deuterium and tritium fusion which forms a Helium-4 atom and a neutrino. What flavor of neutrino is created - a tau, muon, or electron neutrino?
- 1