Search results
Results from the WOW.Com Content Network
Nuclear fission was discovered in December 1938 by chemists Otto Hahn and Fritz Strassmann and physicists Lise Meitner and Otto Robert Frisch. Fission is a nuclear reaction or radioactive decay process in which the nucleus of an atom splits into two or more smaller, lighter nuclei and often other particles. The fission process often produces ...
Otto Hahn (pronounced [ˈɔtoː ˈhaːn] ⓘ; 8 March 1879 – 28 July 1968) was a German chemist who was a pioneer in the fields of radioactivity and radiochemistry. He is referred to as the father of nuclear chemistry and father of nuclear fission. Hahn and Lise Meitner discovered radioactive isotopes of radium, thorium, protactinium and uranium.
Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. The fission process often produces gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay. Nuclear fission was discovered by chemists Otto Hahn and Fritz Strassmann and physicists Lise ...
Neutron howitzers were used by Otto Hahn, Fritz Strassman, and Lise Meitner in 1938 to bombard uranium nuclei with neutrons in the hopes of making transuranic elements. To their surprise, they found barium residue, a clear indication that they had instead fissioned uranium nuclei.
The discovery of the neutron and its properties was central to the extraordinary developments in atomic physics in the first half of the 20th century. Early in the century, Ernest Rutherford developed a crude model of the atom, [1]: 188 [2] based on the gold foil experiment of Hans Geiger and Ernest Marsden. In this model, atoms had their mass ...
RighteousAmong the Nations. Friedrich Wilhelm Strassmann (German: [fʁɪt͡s ˈʃtʁasˌman] ⓘ; 22 February 1902 – 22 April 1980) was a German chemist who, with Otto Hahn in December 1938, identified the element barium as a product of the bombardment of uranium with neutrons.
17 December 1938 – Otto Hahn and his assistant Fritz Strassmann, by bombarding uranium with fast neutrons, discover experimentally and prove nuclear fission with radiochemical methods. [61] 6 January 1939 – Hahn and Strassmann publish the first paper about their discovery in the German review Die Naturwissenschaften. [62]
The four naturally occurring isotopes allow a standard atomic weight to be given. Twenty-nine radioisotopes of protactinium have been characterized, ranging from 211 Pa to 239 Pa. The most stable isotope is 231 Pa with a half-life of 32,760 years, 233 Pa with a half-life of 26.967 days, and 230 Pa with a half-life of 17.4 days.