Fitxer:PositronDiscovery.jpg
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Mida d'aquesta previsualització: 608 × 599 píxels. Altres resolucions: 243 × 240 píxels | 487 × 480 píxels | 779 × 768 píxels | 1.039 × 1.024 píxels | 2.408 × 2.374 píxels.
Fitxer original (2.408 × 2.374 píxels, mida del fitxer: 1,91 Mo, tipus MIME: image/jpeg)
Resum
| Descripció |
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 d'agost de 1932. Published 15 de 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) |
| Permís (Com reutilitzar aquest fitxer) |
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. |
Llicència
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This work is in the public domain because it was published in the United States between 1930 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
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| Data/hora | Miniatura | Dimensions | Usuari/a | Comentari | |
|---|---|---|---|---|---|
| actual | 20:12, 6 maig 2013 | | 2.408 × 2.374 (1,91 Mo) | wikimediacommons>Quibik | Combined with a moire- and halftone-free but blurrier version that was also provided in the article. Much more accurate now. |
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