BFP Rauch: Timeline of Physics: the image this page links, copied from Wikimedia Commons (tpm_timeline_images 0.1.0)

2026-10-06T00:54:44Z

Timeline of Physics: the image this page links, copied from Wikimedia Commons (tpm_timeline_images 0.1.0)

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== Summary ==
{| class="wikitable"
|-
! Description
| <nowiki>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.</nowiki>
|-
! Source
| [https://commons.wikimedia.org/wiki/File:Chadwick_Neutron_Discovery.png File:Chadwick Neutron Discovery.png on Wikimedia Commons]
|-
! Author
| <nowiki>Bdushaw</nowiki>
|-
! Credit
| <nowiki>Own work</nowiki>
|-
! License
| [https://creativecommons.org/licenses/by-sa/4.0 <nowiki>CC BY-SA 4.0</nowiki>]
|-
! Usage terms
| <nowiki>Creative Commons Attribution-Share Alike 4.0</nowiki>
|-
! 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.

File:Beryllium alpha neutron.png - Revision history

BFP Rauch: Timeline of Physics: the image this page links, copied from Wikimedia Commons (tpm_timeline_images 0.1.0)