Lise Meitner - In Our Time Recap

Podcast: In Our Time

Published: 2025-06-05

Duration: 57 min

Guests: Jess Wade, Frank Close, Stephen Bramwell

Summary

The episode delves into Lise Meitner's pivotal role in the discovery of nuclear fission, highlighting her scientific achievements and the challenges she faced as a Jewish woman in Nazi Germany.

What Happened

Lise Meitner, a Jewish Austrian physicist, played a crucial role in the discovery of nuclear fission while being a refugee from Nazi Germany. Over Christmas 1938, she and her nephew Otto Frisch realized that the nucleus of uranium could split like a drop of water, a breakthrough that explained the phenomenon of fission.

Born in Vienna in 1878, Meitner grew up in a liberal household that encouraged her academic pursuits. Despite the barriers women faced in science at the time, she became one of the first female physicists to earn a PhD in Vienna and went on to work in Germany, where she collaborated with Otto Hahn on radioactivity studies.

Meitner's work was often undervalued due to her gender. She faced significant challenges in her career, including not being paid equally and being excluded from recognition. Her collaboration with Hahn led to the discovery of protactinium, but during the Nazi regime, she was forced to flee Germany due to her Jewish heritage.

In the early 20th century, the concept of the atom was evolving, with radioactivity challenging the notion of atoms as indivisible. Meitner's work with Hahn on radioactive decay established a ladder of decay from uranium to lead, revealing that elements could transform into one another.

Despite being overlooked for a Nobel Prize, Meitner's insights were crucial in explaining fission, which Hahn had discovered but could not explain. Her nephew, Frisch, helped her realize that the nucleus could split into two parts, releasing a large amount of energy.

Meitner's contributions were later overshadowed by the development of nuclear weapons. She refused to participate in the Manhattan Project, maintaining her belief that science should be used for good.

The episode highlights the injustice of Meitner not receiving the Nobel Prize for her work on fission and discusses the efforts to restore her legacy, including naming an element, Meitnerium, in her honor.

Key Insights

• The discovery of nuclear fission was made over Christmas 1938 when Lise Meitner and her nephew Otto Frisch realized that the nucleus of uranium could split like a drop of water, explaining the fission process.
• Lise Meitner was one of the first female physicists to earn a PhD in Vienna, overcoming significant gender barriers in the early 20th century to contribute to the field of radioactivity.
• During the Nazi regime, Meitner, a Jewish physicist, was forced to flee Germany, which led to her insights on nuclear fission being initially overlooked, while her collaborator Otto Hahn received the Nobel Prize.
• Element 109, Meitnerium, was named in honor of Lise Meitner, recognizing her contributions to nuclear physics and addressing the historical oversight of her achievements.