# Hans Bethe

_German-American nuclear physicist_

Canonical: https://diginpl.com/people/hans-bethe
Last updated: 2026-10-31

> Hans Albrecht Eduard Bethe (; German: [ˈhans ˈbeːtə] ; 2 July 1906 – 6 March 2005) was a German-American physicist who made major contributions to nuclear physics, astrophysics, quantum electrodynamics and solid-state physics, and received the Nobel Prize in Physics in 1967 for his work on the theory of stellar nucleosynthesis. For most of his career, Bethe was a professor at Cornell University.

## Quick facts

- **Born:** 2 July 1906 ([Wikidata](https://www.wikidata.org/wiki/Q155794#P569))
- **Place of birth:** Strasbourg ([Wikidata](https://www.wikidata.org/wiki/Q155794#P19))
- **Died:** 6 March 2005 ([Wikidata](https://www.wikidata.org/wiki/Q155794#P570))
- **Place of death:** Ithaca ([Wikidata](https://www.wikidata.org/wiki/Q155794#P20))
- **Citizenship:** German Reich; United States ([Wikidata](https://www.wikidata.org/wiki/Q155794#P27))
- **Occupation:** physicist; university teacher; nuclear physicist; scientist ([Wikidata](https://www.wikidata.org/wiki/Q155794#P106))
- **Education:** LMU Munich; Goethe University Frankfurt; University of Cambridge; Sapienza University of Rome; Goethe-Gymnasium ([Wikidata](https://www.wikidata.org/wiki/Q155794#P69))
- **Spouse:** Rose Ewald ([Wikidata](https://www.wikidata.org/wiki/Q155794#P26))
- **Positions held:** chairperson (1955–1955) ([Wikidata](https://www.wikidata.org/wiki/Q155794#P39))
- **Awards:** Pour le Mérite for Sciences and Arts order; Niels Bohr International Gold Medal; Nobel Prize in Physics; Max Planck Medal; Lomonosov Gold Medal; Rumford Prize; Henry Draper Medal; Franklin Medal; Bruce Medal; Oersted Medal; Oskar Klein Medal; Eddington Medal; National Medal of Science; Leo Szilard Lectureship Award; Albert Einstein Peace Prize ([Wikidata](https://www.wikidata.org/wiki/Q155794#P166))

## About

In 1931, Bethe developed the Bethe ansatz, which is a method for finding the exact solutions for the eigenvalues and eigenvectors of certain one-dimensional quantum many-body models. In 1939, Bethe published a paper which established the CNO cycle as the primary energy source for heavier stars in the main sequence classification of stars, which earned him a Nobel Prize in 1967. During World War II, Bethe was head of the Theoretical Division at the secret Los Alamos National Laboratory that developed the first atomic bombs. There he played a key role in calculating the critical mass of the weapons and developing the theory behind the implosion method used in both the Trinity test and the "Fat Man" weapon dropped on Nagasaki in August 1945.

After the war, Bethe played an important role in the development of the hydrogen bomb, as he also served as the head of the theoretical division for the project, although he had originally joined the project with the hope of proving it could not be made. He later campaigned with Albert Einstein and the Emergency Committee of Atomic Scientists against nuclear testing and the nuclear arms race. He helped persuade the Kennedy and Nixon administrations to sign, respectively, the 1963 Partial Nuclear Test Ban Treaty and 1972 Anti-Ballistic Missile Treaty (SALT I). In 1947, he wrote an important paper which provided the calculation of the Lamb shift, which is credited with revolutionizing quantum electrodynamics and further "opened the way to…

## Questions

**When was Hans Bethe born?**  
Hans Bethe was born on 2 July 1906 in Strasbourg.

**What positions has Hans Bethe held?**  
Positions held by Hans Bethe include: chairperson (1955–1955).

**Where did Hans Bethe study?**  
Hans Bethe was educated at LMU Munich, Goethe University Frankfurt, University of Cambridge, Sapienza University of Rome.

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## Sources

- [Wikipedia (English): Hans Bethe](https://en.wikipedia.org/wiki/Hans_Bethe) — [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
- [Wikidata item Q155794](https://www.wikidata.org/wiki/Q155794) — [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/)
- [Image: Hans Bethe.jpg by Los Alamos National Laboratory (Attribution)](https://commons.wikimedia.org/wiki/File:Hans_Bethe.jpg)

## Licence and attribution

Text from the Wikipedia article Hans Bethe, licensed under CC BY-SA 4.0. This page's text is shared under the same licence. Facts from Wikidata (CC0). Image: Hans Bethe.jpg — Los Alamos National Laboratory, Attribution.

## Cite this page

"Hans Bethe". DigiNepal. Last updated 31 October 2026. https://diginpl.com/people/hans-bethe. Retrieved 15 November 2026.