Caroline told the story of the discovery of nuclear fission (and its consequences) through the lives of two women scientists: Irene Joliot-Curie, who was French and Lise Meitner, who was Austrian.
Irene was Marie Curie’s elder daughter, born at the end of the 19th century and worked with her at the Radium Institute, both of them running a mobile X-Ray unit during WWI. There she met and married her husband Frederic Joliot who also because her working partner. In the 1930s they carried out and published many experiments in the field, though did miss out on recognising two sub atomic particles: the neutron and the positron. But in 1935 they discovered how to create artificial radiation and for this they were given the Nobel Prize in chemistry.
Frederic and Irene were both socialists and were also firm believers that they should share their work with other scientists. In 1938 they published the results of an experiment of theirs bombarding aluminium foil with sub-atomic particles and this caused another pair of scientists, Otto Hahn and Lise Meitner, working in Berlin to run further experiments.
Lise Meitner was born in Vienna in 1875 and was not able to access secondary education until she was in her late 20s. Then she because the first woman to gain a doctorate in physics in Vienna and only the second in the world. She went to Berlin and there met Otto Hahn with whom she had a long, successful working relationship. Despite not being allowed to work in the main Institute initially things gradually loosened up and she became a full professor and Head of Department. Einstein called her the German “Marie Curie”. However, the anti-Jewish laws when Hitler came to power in 1933 affected her. She was no longer able to attend conferences, speak in public or put her name to published work.
In 1938, after the Anschluss, she had to escape to Sweden. There at Christmas in 1938 she finally worked out that radiation was produced by the atom splitting, something that had not been understood before.
This was the first big problem in nuclear physics solved. The next was how to achieve a continuous release of energy; the chain reaction. Here the equipment in the Radium Institute was important. Also, scientists across the world realised that there was a possibility of developing a bomb of unimaginable proportions. Irene and Frederic stopped publishing and archived their work. They also smuggled their stocks of heavy water out of the country. But they couldn’t move their Cyclotron (a particle accelerator). Irene left for Switzerland and treatment for TB, but Frederic returned to Paris and joined the French Resistance. Every time the German scientists arrived to use the Cyclotron, he made sure it never worked.
However, the atom bomb was of course developed as part of the Manhattan project in the United States. Lise Meitner had been invited to join the project but refused categorically. She hated being known as the mother of the atom bomb.
Irene survived for 10 years after the end of WWII. She was an active member of the Peace Initiatives and also, as a committed feminist, made several applications to the French Academy of Scientists which didn’t accept women to make a very public point.
Lise went on teaching in Sweden after the war, only retiring to the UK in 1960. She spent many years working to convince the German scientists to accept that they had supported an evil regime and even propped it up, to Germany’s detriment, in the final years of the war. She is buried in Hampshire, where the legend on her gravestone says “A physicist who never lost her humanity”.
