File:PositronDiscovery.jpg
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原始文件 (2,408 × 2,374像素,文件大小:1.91 MB,MIME类型:image/jpeg)
摘要
描述PositronDiscovery.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. |
日期 | Photographed 1932年8月2日. Published 1933年3月15日. |
来源 | Anderson, Carl D. (1933). "The Positive Electron". Physical Review 43 (6): 491–494. DOI:10.1103/PhysRev.43.491. |
作者 | Carl D. Anderson (1905–1991) |
授权 (二次使用本文件) |
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. |
许可协议
Public domainPublic domainfalsefalse |
本作品属于公有领域,因为其是于1929~1963年之间在美国出版,且无论其是否具有著作权声明,它并未进行著作权更新。更多信息请参考Commons:Hirtle chart/zh及著作权更新日志。请注意该作品在其他对美国作品不适用较短期限法则的司法管辖区仍然受著作权保护(基于作者的逝世日期),如加拿大(作者过世后70年)、中国大陆(作者过世后50年,不包括香港和澳门)、德国(作者过世后70年)、墨西哥(作者过世后100年)、瑞士(作者过世后70年)及其他有本地条约的国家。
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媒体类型 简体中文(已转写)
image/jpeg
2 8 1932
文件历史
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日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
---|---|---|---|---|---|
当前 | 2013年5月6日 (一) 19:12 | 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. | |
2013年5月6日 (一) 18:10 | 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. | ||
2008年5月3日 (六) 16:54 | 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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