Meitner–Hupfeld effect

The Meitner–Hupfeld effect, named after Lise Meitner and Hans-Hermann Hupfeld, is an anomalously large scattering of gamma rays by heavy elements. The effect was later explained by a broad theory from which evolved the Standard Model, a theory for explaining the structure of the atomic nucleus. The anomalous gamma-ray behavior was eventually ascribed to electron–positron pair production and annihilation.

Although Meitner was recognized for her work,^[1] Hupfeld contribution is usually ignored, and little or no account of his life exists.

See also

• Pair production
• Electron-positron annihilation