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VOLUME 42 (1985) | ISSUE 11 | PAGE 472
Final-state interaction of a β particle and associated phenomena
The final-state interaction of a β particle with atomic electrons and corrections to the lifetime of atomic tritium and pionium are calculated to terms of order aVv2. The final-state interaction makes it possible to extract new information on the electron distribution near the Τ in a medium. When the final-state interaction is taken into account, Simpson's data cannot be explained by the emission of a heavy neutrino.