Griffiths Introduction to Elementary Particles · Problem 6.2

Quantum Electrodynamics — David J. Griffiths

Physics — QFT · decay-lifetime

Problem

Nuclear physicists traditionally work with "half-life" (

t_{1/2}

) instead of mean life (

\tau

);

t_{1/2}

is the time it takes for half the members of a large sample to decay. Show that for exponential decay [eq. (6.2)]

t_{1/2} = \tau \ln 2