Solar Neutrinos


solar neutrinos Electron neutrinos (see neutrino astronomy) produced in vast quantities by nuclear reactions in the Sun's energy-generating core. Every second, an estimated 3 X 1015 solar electron neutrinos enter each square metre of the Earth's Sun-facing side and pass out through the other side unimpeded. The neutrino reaction rate with matter is so small that a special Solar Neutrino Unit (SNU) is used to specify the flux. One SNU is equal to one neutrino interaction per second for every 1036 atoms. To measure this flux, neutrino detectors must contain large amounts of material and be placed deep underground to filter out confusing energetic particles generated by cosmic rays.

The observed flux of electron neutrinos is compared with the number predicted by the standard model of the Sun. Typically, only one-third to one-half the predicted number were found in the pioneering experiments, a discrepancy known as the solar neutrino problem. For example, the homestake mine experiment obtained an average flux of 2.550.25 SNU compared with the predicted 8.0 1.0 SNU. Other detectors, including Kamiokande, Sage and Gallex, gave similar findings.

The solar neutrino problem might have been solved if there was a mistake in our models of the solar interior. However, helioseismology observations accurately confirm the predicted core temperature of 15.6 million K, indicating that the neutrino problem could not be solved with plausible variations in the standard model.

In one alternative explanation, the electron neutrinos produced by nuclear reactions in the Sun's core can change into muon or tau neutrinos on their way out of the

Sun, thereby becoming invisible to these detectors, which responded only to electron neutrinos. This metamorphosis is known as neutrino oscillation, since a neutrino oscillates back and forth between types as it travels through space and time. The neutrino transformation that occurs when travelling through matter, such as the Sun or Earth, is named the MSW effect after the surname initials of the scientists who developed the theory in the 1970s and 80s.

Experiments at the underground Sudbury Neutrino Observatory in Canada confirm the previously observed deficit in solar neutrinos to be a result of neutrino oscillation. Containing a 1000-tonne reservoir of 'heavy water' (D2O) in which the hydrogen has been replaced with a heavy isotope, deuterium, the Sudbury detector is, uniquely, capable of distinguishing between neutrino types. Results published in 2001 showed the expected numbers of neutrinos, as predicted by the standard model of the solar interior.

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Fun back-of-napkin math: how much would solar output have to increase to superheat our core with neutrinos?...

Not one what so ever. Vast amounts of neutrinos each second move right through our planet. For as strong matter is concerned, it seems as a near vacuum cleaner pertaining to neutrinos.

How many neutrinos do you need to give 10^12 M?...

Because the neutrino’s mass is actually. 0001 of the electron, you may use that in order to to the sun’s bulk. It is possible to calculate the sun’s bulk in electrons once you learn the

Solar Neutrino Problem ~ HELP?...

couple of
http: //en. wikipedia. org/wiki/Solar_neutrino_problem

If you’re pleasant.

Is the premise of the 2012 movie plausible~Can neutrinos sent by a solar flare super heat the Earth's core?...

Possibly that can’t happen and also the reasons given in film production company are almost certain with out merit.

Still some reputable researchers do believe the world may w

What would we observe on Earth if the Sun's internal energy source suddenly shut off?...

It might take over several years for the power to leave the celebrity. A pretty hypothetical query. If just core burning up was shut down, sunlight would collapse the

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Elemental fusion is the energy procedure powering the sun. The actual missing solar neutrino issue is talked about. (Raymond Davis distributed the 2002 Nobel Prize within Physics for his focus on measuring neutrinos from to

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Solar energy Flares, Solar energy Neutrinos, What’s the bond?

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