Nuclear fusion
Nuclear fusion combines nuclei, releasing energy that powers stars and weapons.
Nuclear fusion is a reaction in which two or more atomic nuclei combine to form a larger nucleus, with the difference in mass between reactants and products manifested as either the release or absorption of energy. This process powers active stellar cores and, through nucleosynthesis in the Big Bang and stars, creates all elements lighter than nickel. Fusion typically occurs via thermonuclear fusion, requiring extremely high temperature, density, and confinement time—conditions found only in thermonuclear weapons, boosted fission weapons, and fusion power experiments.
- field
- Nuclear physics
- known_for
- Powering stars, thermonuclear weapons, and potential energy source
- key_reactions
- Deuterium–tritium (DT) fusion, deuterium–deuterium (DD) fusion
Lore & Background
Research into fusion for military purposes began in the early 1940s as part of the Manhattan Project. Later innovation allowed two-stage weapons to be significantly miniaturized.
Reader's Guide
Nuclear fusion is fundamental to understanding stellar energy production and the synthesis of light elements. Its theoretical foundation was laid in the early 20th century by scientists like Harkins, Eddington, Gamow, and Bethe, who explained how stars fuse hydrogen into helium. Experimental milestones in the 1930s—from Cockcroft and Walton's first artificial fusion to Oliphant's demonstration of deuterium fusion and Ruhlig's discovery of the DT reaction—established the key reactions. The weaponization of fusion during the Manhattan Project and Cold War led to the development of thermonuclear weapons, including the Teller-Ulam design and boosted fission weapons. These advances also demonstrated the extreme conditions required for fusion. Controlled fusion for energy remains a major scientific and engineering challenge, pursued in devices like tokamaks and stellarators. Fusion's significance extends to its role as a neutron source and in superheavy element production, while its potential as a nearly limitless energy source continues to drive research.
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