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Alpha particles, also called alpha rays or alpha radiation, ... In 1899, Rutherford discovered that uranium radiation is a mixture of two types of radiation. [9]: ...
He had discovered the existence of alpha rays, beta rays, and gamma rays, and had proved that these were the consequence of the disintegration of atoms. In 1906, he received a visit from the German physicist Hans Geiger , and was so impressed that he asked Geiger to stay and help him with his research.
In 1903, Rutherford considered a type of radiation, discovered (but not named) by French chemist Paul Villard in 1900, as an emission from radium, and realised that this observation must represent something different from his own alpha and beta rays, due to its very much greater penetrating power.
He was born October 29, 1870. Owens was a graduate of the Industrial College of Johns Hopkins University and Columbia University.. On August 19, 1891 he was employed as an adjunct professor in electrical engineering in the newly formed school of Electrical Engineering at the University of Nebraska.
Robert Bowie Owens (1870–1940), American electric engineer who discovered alpha rays; Robert A. Owens (1920–1942), United States Marine Corps Medal of Honor recipient; Robert Owens (musician) (born 1961), vocalist on Chicago house records in the 1980s; Robert Owens (composer) (1925–2017), African-American composer, pianist, and actor
1932 Antielectron (or positron), the first antiparticle, discovered by Carl D. Anderson [13] (proposed by Paul Dirac in 1927 and by Ettore Majorana in 1928) : 1937 Muon (or mu lepton) discovered by Seth Neddermeyer, Carl D. Anderson, J.C. Street, and E.C. Stevenson, using cloud chamber measurements of cosmic rays [14] (it was mistaken for the pion until 1947 [15])
1896 Wilhelm Conrad Röntgen discovers the X-rays while studying electrons in plasma; scattering X-rays—that were considered as 'waves' of high-energy electromagnetic radiation—Arthur Compton will be able to demonstrate in 1922 the 'particle' aspect of electromagnetic radiation. 1899 Ernest Rutherford discovered the alpha and beta particles ...
Villard was a modest man and he did not suggest a specific name for the type of radiation he had discovered. In 1903, it was Ernest Rutherford who proposed to call Villard's rays gamma rays because they were far more penetrating than the alpha rays and beta rays which he himself had already differentiated and named (in 1899) on the basis of ...