open access

https://hdl.handle.net/2115/54942

Finite-size corrections to Fermi's golden rule: I. Decay rates

英語

2013-07-01

Oxford univ press inc

Progress of theoretical and experimental physics

7

1/54-54/54

A quantum mechanical wave of a finite size moves like a classical particle and shows a unique decay probability. Because the wave function evolves according to the Schrodinger equation, it preserves the total energy but not the kinetic energy in the intermediate-time region of a decay process where those of the parent and daughters overlap. The decay rate computed with Fermi's golden rule requires corrections that vary with the distance between the initial and final states, and the energy distribution of the daughter is distorted from that of plane waves. The corrections have universal properties in relativistically invariant systems and reveal macroscopic quantum phenomena for light particles. The implications for precision experiments in beta decays and various radiative transitions are presented.

学術雑誌論文

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2050-3911