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Lise Meitner Created 2026-10-18 Updated 2026-10-31
A physicist who helped explain nuclear fission. Lise Meitner and Otto Robert Frisch interpreted the energy release associated with the chemical findings of Otto Hahn and Fritz Strassmann. Following these contributions together distinguishes the identification of reaction products from their physical explanation.[ref]
Lise Meitner im Porträt. Treffpunkt der Nobelpreisträger. Das Harnack-Haus in Berlin-Dahlem by Susanne Kiewitz; Susanne Kiewitz, final paragraphs: Hahn–Strassmann chemical findings, Meitner–Frisch interpretation and contributions to fission
Otto Robert Frisch Created 2026-10-18 Updated 2026-11-05
Otto Robert Frisch and Lise Meitner interpreted the barium found after uranium bombardment as evidence that a heavy atomic nucleus could divide into two large fragments. Their 1939 paper related the available energy to nuclear mass differences and the electrical repulsion of the fragments. This supplied a physical account of nuclear fission, connecting a chemical identification of the products with a new type of nuclear transformation and its large energy release.[ref]
Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction by Lise Meitner and Otto Robert Frisch. 1939 Nature paper, interpretation of barium and energy estimate
A physicist who worked with Lise Meitner on the interpretation of nuclear fission.[ref]
Lise Meitner im Porträt. Treffpunkt der Nobelpreisträger. Das Harnack-Haus in Berlin-Dahlem by Susanne Kiewitz; Early-January 1939 discussion: Otto Robert Frisch identified as a physicist and Meitner's collaborator
Portrait of Otto Robert Frisch
. Photograph by Emilio Segrè, courtesy AIP Emilio Segrè Visual Archives, Segrè Collection. CC BY 4.0, via Wikimedia Commons. Source.