Passage
In December 1938, the chemist Otto Hahn and his assistant Fritz Strassmann performed a series of experiments in Berlin, bombarding uranium nuclei with neutrons. To their surprise, the chemical analysis revealed the presence of barium, an element much lighter than uranium. This outcome defied the prevailing belief that atomic nuclei could only chip away, not split into large pieces. Confused, Hahn wrote to his longtime physicist collaborator, Lise Meitner, who was living in exile in Sweden. Meitner, walking through a snowy forest with her nephew Otto Frisch, pondered the puzzling data. Using Niels Bohr’s model of a nucleus behaving like a liquid drop, she calculated how a nucleus could stretch and divide under neutron bombardment, releasing immense energy. She immediately sent these calculations back to Hahn. In early 1939, Hahn published the experimental results detailing the presence of barium, omitting Meitner's name from the paper. He later asserted that including a Jewish scientist in the publication would have endangered his own position in Germany. Although Meitner’s theoretical framework resolved the chemical anomaly, the Nobel Committee subsequently awarded the chemistry prize for the discovery to Hahn alone.
Based on the passage, match each of the key events or decisions from the historical narrative of the discovery of nuclear fission with the implicit relationship or motivation that explains its role in the events.
- Hahn and Strassmann's detection of bariumAn empirical anomaly that defied established physics but lacked a theoretical explanation.
- Meitner's calculations using the liquid-drop modelThe theoretical bridge that resolved a conflict between experimental chemistry and nuclear physics.
- Hahn's omission of Meitner's name from the 1939 publicationA choice dictated by external societal constraints rather than a denial of scientific contribution.