Meitner, Lise (lē`zə mīt`nər), 1878–1968, Austrian-Swedish physicist and mathematician. She was professor at the Univ. of Berlin (1926–33). A refugee from Germany after 1938, she became associated with the Univ. of Stockholm and with the Nobel Institute at Stockholm. In 1917, working with Otto Hahn Hahn, Otto (ô`tō hän), 1879–1968, German chemist and physicist.
..... Click the link for more information. , she isolated the most stable isotope of the element protactinium protactinium (prō'tăktĭn`ēəm), radioactive chemical element; symbol Pa; at. no. 91; at. wt. 231.0359; m.p.
..... Click the link for more information. ; she also investigated the disintegration products of radium radium (rā`dēəm) [Lat. radius=ray], radioactive metallic chemical element; symbol Ra; at. no. 88; at. wt. 226.0254; m.p.
..... Click the link for more information. , thorium thorium (thôr`ēəm) [from Thor], radioactive chemical element; symbol Th; at. no. 90; at. wt. 232.0381; m.p.
..... Click the link for more information. , and actinium actinium (ăktĭn`ēəm) [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; at. wt. 227.0278; m.p.
..... Click the link for more information. and the behavior of beta rays. In 1938 she participated in experimental research in bombarding the uranium nucleus with slow-speed neutrons. Meitner interpreted the results as a fission of the nucleus and calculated that vast amounts of energy were liberated. Her conclusion contributed to the development of the atomic bomb. In 1949, she became a Swedish citizen. The element with the atomic number 109 is named meitnerium meitnerium (mītnĭr`ēəm), artificially produced radioactive chemical element; symbol Mt; at. no.
..... Click the link for more information. in her honor.

Bibliography

See biography by R. L. Sime (1996); P. Rife, Lise Meitner and the Dawn of the Nuclear Age (1997).

Meitner, Lise

(born Nov. 7, 1878, Vienna, Austria—died Oct. 27, 1968, Cambridge, Cambridgeshire, Eng.) German physicist. She worked at Berlin's Kaiser Wilhelm Institute (1912–38), also teaching at the University of Berlin (1926–38). At a laboratory that she set up with Otto Hahn, the two isolated the radioactive isotope protactinium-231. In the 1930s, with Hahn and Fritz Strassmann (1902–80), she investigated the products of neutron bombardment of uranium. She left Germany in 1938 for Sweden. After Hahn and Strassmann demonstrated that barium appears in neutron-bombarded uranium, she and her nephew Otto Frisch (1904–79) explained the physical characteristics of this division and in 1939 proposed the term fission for the process. She shared the 1966 Enrico Fermi Award with Hahn and Strassmann. Element 109, meitnerium, is named in her honour.