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Geiger had brought with him a new model of his Geiger counter, which had been improved by his post-doctoral student Walther Müller. Chadwick had not used one since the war, and the new Geiger–Müller counter was potentially a major improvement over the scintillation techniques then in use at Cambridge, which relied on the human eye for ...
A schematic of the nucleus of an atom indicating β − radiation, the emission of a fast electron from the nucleus (the accompanying antineutrino is omitted). In the Rutherford model for the nucleus, a red sphere was a proton with positive charge, and a blue sphere was a proton tightly bound to an electron, with no net charge.
Johannes Wilhelm "Hans" Geiger (/ ˈ ɡ aɪ ɡ ər /; German: [ˈɡaɪɡɐ]; 30 September 1882 – 24 September 1945) was a German physicist.He is best known as the co-inventor of the detector component of the Geiger counter and for the Geiger–Marsden experiment which discovered the atomic nucleus.
Neither Rutherford nor James Chadwick at the Cavendish Laboratory in Cambridge were convinced by the gamma ray interpretation. [59] Chadwick quickly performed a series of experiments that showed that the new radiation consisted of uncharged particles with about the same mass as the proton.
Such a nuclear constitution was known to be inconsistent with dynamics either classical or early quantum but seemed inevitable until the neutron hypothesis by Rutherford and discovery by English physicist James Chadwick.
1932 James Chadwick discovers the neutron; 1932 John Cockcroft and Ernest Walton split lithium and boron nuclei using proton bombardment; 1932 Werner Heisenberg presents the proton–neutron model of the nucleus and uses it to explain isotopes; 1933 Ernst Stueckelberg (1932), Lev Landau (1932), and Clarence Zener discover the Landau–Zener ...
Lise Meitner (/ ˈ l iː z ə ˈ m aɪ t n ər / LEE-zə MYTE-nər; German: [ˈliːzə ˈmaɪtnɐ] ⓘ; born Elise Meitner, 7 November 1878 – 27 October 1968) was an Austrian-Swedish nuclear physicist who was instrumental in the discovery of nuclear fission and of protactinium.
Elementary particles from the Standard Model of particle physics that have so far been observed. The Standard Model is the most comprehensive existing model of particle behavior. All Standard Model particles including the Higgs boson have been verified, and all other observed particles are combinations of two or more Standard Model particles.