File:PositronDiscovery.jpg
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![Slika:PositronDiscovery.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/6/69/PositronDiscovery.jpg/608px-PositronDiscovery.jpg)
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Povzetek
OpisPositronDiscovery.jpg |
English: Cloud chamber photograph of the first positron ever observed. The thick horizontal line is a lead plate. The positron entered the cloud chamber in the lower left, was slowed down by the lead plane, and curved to the upper left. The curvature of the path is caused by an applied magnetic field that acts perpendicular to the image plane. The higher energy of the entering positron resulted in lower curvature of its path. Original caption: A 63 million volt positron (Hρ = 2.1×105 gauss-cm) passing through a 6 mm lead plate and emerging as a 23 million volt positron (Hρ = 7.5×104 gauss-cm). The length of this latter path is at least ten times greater than the possible length of a proton path of this curvature. |
Datum | Photographed 2. avgust 1932. Published 15. marec 1933. |
Vir | Anderson, Carl D. (1933). "The Positive Electron". Physical Review 43 (6): 491–494. DOI:10.1103/PhysRev.43.491. |
Avtor | Carl D. Anderson (1905–1991) |
Dovoljenje (Nadaljnja uporaba datoteke) |
Obtained from American Physical Society, March 5, 2008. The copyright for the periodical containing this picture, if renewed, would have had to be renewed in 1960 or 1961. I checked the Catalog of copyright entries for Periodicals in 1960 and 1961, http://onlinebooks.library.upenn.edu/cce/, but The Physical Review is not listed there. Therefore, the copyright on the entire issue of The Physical Review, including this picture, has expired. |
Licenca
Public domainPublic domainfalsefalse |
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To delo je v javni domeni, ker je bilo objavljeno v Združenih državah Amerike med letoma 1929 in 1963, in čeprav je morda imelo oznako avtorskega dela, avtorske pravice niso bile podaljšane. Za dodatno razlago glejte Commons:Hirtle chart in dnevnike podaljšanja avtorskih pravic. Upoštevajte, da je to delo morda še vedno varovano v jurisdikcijah, ki za dela iz ZDA ne upoštevajo pravila krajšega roka (glede na datum avtorjeve smrti), kot so Kanada (70 let p. s. a.), celinska Kitajska (50 let p. s. a., ne pa tudi Hongkong ali Makav), Nemčija (70 let p. s. a.), Mehika (100 let p. s. a.), Švica (70 let p. s. a.) in druge države z individualnimi pogodbami.
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Napisi
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The first cloud chamber photograph of a positron's path
התצלום הראשון של פוזיטרון בתא ערפל
Diviz
Ruska antihmota obrazek vyfotene asi. Neverim moc ale neco to je a je teho moc a
image/jpeg
2. avgust 1932
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Datum in čas | Sličica | Velikost | Uporabnik | Komentar | |
---|---|---|---|---|---|
trenutno | 21:12, 6. maj 2013 | ![]() | 2.408 × 2.374 (1,91 MB) | Quibik | Combined with a moire- and halftone-free but blurrier version that was also provided in the article. Much more accurate now. |
20:10, 6. maj 2013 | ![]() | 2.500 × 2.500 (1,97 MB) | Quibik | Re-extracted the image from the source article in greater resolution, removed halftone & moiré and adjusted levels. | |
18:54, 3. maj 2008 | ![]() | 848 × 755 (71 KB) | HPaul | {{Information |Description=Cloud chamber photograph of the first positron ever observed |Source=Physical Review, Vol.43, p. 491 |Date=March 15, 1933 |Author=Carl D. Anderson |Permission=obtained from American Physical Society, March 5, 2008 |other_version |
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