Weak /nuclear Force or weak interaction is the mechanism of interaction between sub-atomic particles that causes radioactive decay and thus plays an essential role in nuclear fission. The weak force acts upon all known fermions—i.e., elementary particles with half-integer values of intrinsic angular momentum, or spin. The effectiveness of the weak force is confined to a distance range of 10?17 meter, about 1% of the diameter of a typical atomic nucleus. In 1933, Enrico Fermi proposed the first theory of the weak interaction, known as Fermi's interaction. It is mediated by force carrier particles that have significant masses. The weak interaction is the only fundamental interaction that breaks parity-symmetry, and similarly, the only one to break charge-parity symmetry. Other important examples of phenomena involving the weak interaction include beta decay and the fusion of hydrogen into helium that powers the Sun's thermonuclear process.

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