Abstract
The development of gamma ray lasers (GRASER) will depend on the utilization of long‐lived, recoilless, nuclear, gamma transitions, i.e., the Mossbauer effect. The lifetimes required from practical considerations must be on the order of seconds at least. It is not clear that the Mossbauer effect has ever been observed in such longlived states. We propose some experimental techniques to unambiguously observe the effect of about 40 seconds. The techniques proposed are: coincidence Mossbauer spectroscopy; conversion electron Mossbauer spectroscopy; and gravitational line sweeping.
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