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Talk:Super-Kamiokande

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From the page: Superkamiokande that i redirected to this page. (Revision as of 12:06, 21 Apr 2004)

Superkamiokande is built in the former kamioka mine in Japan. The experiment filters cosmic radiation (pions, high-energetic protons, ...), which are absorbed in the rock formations above.

Athmospheric neutrino production

The detector

The detector consists of a huge tank filled with water. The outer wall is equipped with lots of photomultipliers.

If a neutrino produced in the athmosphere crosses the tank compton scattering may occur with the electrons of water. The high energetic electron set free in this process crosses the detector with a speed higher than the speed of light within the water, producing Cherenkov radiation (Cherenkov effect). The radiation cone is observed with the photmultipliers on the wall.

Through reconstructing the eletron path (it's energy is already known from the radiation cone) one may acquire information about the path of the neutrino wich caused the electron prodution.

Interpretation The Myon-Neutrino to electron-neutrino ratio observed is incompatible with the theoretcal predictions.

What is the observed neutrino flux, in neutrinos per day? What fraction is cosmic, atmospheric and KEK? linas 03:33, 14 Jun 2005 (UTC)

I'm not sure if they publish an atmospheric flux number because of large uncertainties on the neutrino cross section. In terms of the number of observed events (which is different from the neutrino flux), from the Jan 25, 2005 "final" atmospheric paper (0501064)

Fully contained atmospheric events: 13676.7 in 1489 days Partially contained atm ev: 911 in 1489 days Upward going muons: 2259 events in 1646 days

Flying fish 20:59, 2 December 2005 (UTC)[reply]

Thanks. Yes, I meant "detected events". I couldn't prevail on you to add this info directly to the article, could I? There were several things I was thinking about:

• What might a supernova look like to this thing? (in terms of number of detected events) I'm guessing that 2-10 events total; however, since this is seeing ten events a day already, a supernova would stick out only because all the events came from the same direction.
• When measuring neutrino oscillations, I understand this was done by aiming neutrinos from KEK towards this detector. I was curious to find out how many of these are detected (compared e.g. to the atmospheric ones).
• I was reading about the various different detectors, and wanted to get a feeling for how they compared ot one-another, and total number of events per day seemed like a crude but useful measure.

And .. since you bring up the idea of upward-moving muons: I presume these are 100% from galactic/extragalactic sources. What's the angular resolution for the direction of origin of any one event? Can objects in the sky be resolved, or is the distribution isotropic? What's the distribution of energies? I know I'm asking for a lot ... and have little justification other than idle curiosity. linas 22:37, 2 December 2005 (UTC)[reply]

"In July 2005, preparation to restore the detector to its original form by reinstalling about 6000 PMTs."
This sentence no verb.
--213.215.90.175 16:02, 2 December 2005 (UTC)[reply]

"These gases are dissolved in water with a serious background of events source for solar neutrinos in the MeV energy range and the dissolved oxygen encourages the growth of bacteria." As a new student to this subject this sentence appears to have an unrelated word, "serious," and a disjointed or mixed meaning. May an expert assess the situation.

I'm not sure it would be a good idea to spin this article off into three separate articles, but I also don't think the article about the kamiokande experiments should be called "Super-Kamiokande". Maybe we could make a new article named "Kamioka neutrino experiments" and direct everything there? Or move everything about KamiokaNDE and Kamiokande-II there, have a short Super-K section and keep this as the "main page" for Super-K information? I think I like that second option the best. Anyone else feel strongly about it? It would make sense to put K2K, T2K, KamLAND and Hyper-K information on such a page too. The information belongs together, but I don't think it belongs on a page called "Super-Kamiokande".

I have started a new page for Kamioka Observatory, it's in development so right now you can find it here. I'd like to finish it as quickly as possible and see if we can get it into the "Did you know..." section of the main page, so any help would be appreciated! Flying fish 05:11, 12 July 2006 (UTC)[reply]

Before I modified it, the article was ambiguous on the units for the mass of water in the detector, 'tons'. I changed it to clarify that it referred to 'metric tons', and included the 'US tons' equivalent. That seems straightforward. More questionably, I also calculated the volume and included a more precise figure for the mass. This perhaps is questionable because the references use the rounded number and it may be that the tank was not completely filled. (I did the volume calculation to determine the units on the mass, and once I had it, it seemed natural to include additional digits since the dimensions were given to three significant digits.) I also corrected the conversion of the units on the original tank which were in error. TundraGreen (talk) 02:49, 5 May 2021 (UTC)[reply]