File:PositronDiscovery.jpg
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DescripcionPositronDiscovery.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. |
Data | Photographed 2 agost de 1932. Published 15 març de 1933. |
Font | Anderson, Carl D. (1933). "The Positive Electron". Physical Review 43 (6): 491–494. DOI:10.1103/PhysRev.43.491. |
Autor | Carl D. Anderson (1905–1991) |
Permission (Reütilizacion d'aqueste fichièr) |
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. |
Publicat jos licéncia(s)[modificar]
Public domainPublic domainfalsefalse |
Cette œuvre est dans le domaine public car elle a été publiée aux États-Unis entre 1929 et 1963 et, qu'il y eut ou non un avis de copyright, ce copyright n'a pas été renouvelé. À moins que son auteur ne soit décédé depuis suffisamment longtemps, il reste "copyrighté" dans les pays ou lieux qui n'appliquent pas la règle du terme le plus court pour les œuvres américaines, comme l'Allemagne (70 ans), le Canada (70 ans), la Chine continentale (50 ans ; sauf pour Hong-Kong et Macao), le Mexique (100 ans), la Suisse (70 ans), et d'autres pays avec des traités individuels. Voir Commons:Hirtle chart pour davantage d'explications.
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Data e ora | Miniatura | Dimensions | Utilizaire | Comentari | |
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actual | 6 mai de 2013 a 19.12 | 2 408 × 2 374 (1,91 Mo) | Quibik (discussion | contribucions) | Combined with a moire- and halftone-free but blurrier version that was also provided in the article. Much more accurate now. | |
6 mai de 2013 a 18.10 | 2 500 × 2 500 (1,97 Mo) | Quibik (discussion | contribucions) | Re-extracted the image from the source article in greater resolution, removed halftone & moiré and adjusted levels. | ||
3 mai de 2008 a 16.54 | 848 × 755 (71 Ko) | HPaul (discussion | contribucions) | {{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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