File:Beryllium alpha neutron.png
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Summary
| Description | A schematic diagram of the experiment James Chadwick used to discover the neutron in 1932. At left, a polonium source was used to irradiate beryllium with alpha particles, which induced a type of uncharged radiation initially thought to be gamma rays. When this radiation struck paraffin wax, protons were ejected with ca. 5.5 MeV kinetic energy. The protons were observed using a small ionization chamber, called a counter, that detected a signal recorded on an oscillograph. Adapted from J. Chadwick, The Existence of a Neutron, Proc. Royal Society London, Series A, 136, 692-708, 1932. |
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| Source | File:Chadwick Neutron Discovery.png on Wikimedia Commons |
| Author | Bdushaw |
| Credit | Own work |
| License | CC BY-SA 4.0 |
| Usage terms | Creative Commons Attribution-Share Alike 4.0 |
| Used on | Timeline of Physics, the 1932 row (Discovery of the Neutron) |
A byte-for-byte copy of the Commons file (SHA-1 71799af0dd2cb969c1b035b8aac4ed5b9748287d, 56626 bytes), uploaded by tpm_timeline_images 0.1.0. It is stored here under the name the page links, File:Beryllium alpha neutron.png; on Commons it is File:Chadwick Neutron Discovery.png.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:54, 6 October 2026 | | 1,600 × 799 (55 KB) | BFP Rauch (talk | contribs) | Timeline of Physics: the image this page links, copied from Wikimedia Commons (tpm_timeline_images 0.1.0) |
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