Lise Meitner

Lise Meitner was born on November 7, 1878, in Vienna, Austria, the third of eight children in a progressive Jewish family whose father was a lawyer with deep respect for intellectual life. At a time when Austrian women were formally barred from university education, Meitner prepared privately and passed the external matriculation examination in 1901, entering the University of Vienna to study physics. She became the second woman to earn a doctoral degree in physics from that institution, completing her dissertation in 1906 under the supervision of Ludwig Boltzmann, one of the great theoretical physicists of the era.

Berlin and Partnership with Hahn

In 1907, Meitner moved to Berlin to attend lectures by Max Planck, who became a mentor and lifelong supporter. There she began what would become a thirty-year scientific partnership with chemist Otto Hahn. Their collaboration was initially constrained by the attitudes of the time: the chemistry department's director refused to allow women in the main building, forcing Meitner to work in a converted carpenter's workshop in the basement. She received no salary for the first years of her work. Despite these obstacles, the partnership with Hahn flourished, and together they discovered the radioactive element protactinium in 1917. Meitner became head of the physics department at the Kaiser Wilhelm Institute for Chemistry, a position of genuine institutional authority rare for any woman in early twentieth-century Germany.

Exile and the Discovery of Fission

When the Nazis rose to power, Meitner's scientific reputation initially offered some protection, but the annexation of Austria by Germany in 1938 stripped her of Austrian citizenship and exposed her to the full force of Nazi racial laws. With the assistance of colleagues who organized a covert escape, she fled Germany in July 1938 with little more than a few summer clothes and ten marks, eventually settling in Stockholm to work at the Nobel Institute for Physics. That winter, she received a letter from Hahn describing puzzling experimental results: when uranium was bombarded with neutrons, the products appeared to include barium — a much lighter element, suggesting the uranium nucleus had somehow split apart. Hahn was baffled and wrote to Meitner seeking an explanation.

During a Christmas visit with her nephew Otto Robert Frisch, also a physicist, Meitner worked through the problem during a walk in the snowy Swedish countryside. Using Niels Bohr's liquid-drop model of the nucleus, she and Frisch calculated that the uranium nucleus, when struck by a neutron, could indeed split into two smaller nuclei — releasing an enormous amount of energy consistent with Einstein's mass-energy equivalence formula. They coined the term nuclear fission for the process, by analogy with the biological term for cell division. Their paper explaining the theoretical mechanism was published in Nature in February 1939 and sent shockwaves through the physics community, effectively launching the nuclear age.

The Nobel Controversy

In 1944, Otto Hahn was awarded the Nobel Prize in Chemistry for the discovery of fission. Meitner received nothing, a decision widely criticized by scientists then and since. Hahn's own correspondence makes clear that Meitner's theoretical insight was indispensable to understanding what his experiments had produced, yet the Nobel Committee — which had access to this record — chose to frame the discovery as purely experimental and chemical. Meitner was nominated for the Nobel Prize multiple times without success. She declined an invitation to participate in the Manhattan Project, reportedly saying she did not wish to work on a bomb. She became a Swedish citizen in 1949 and later moved to Cambridge, England, where she died on October 27, 1968. In 1997, element 109 was named meitnerium in her honor — one of science's belated attempts to correct a historic injustice.