On the super-narrow gamma lines of nuclei in a Bose–Einstein condensate

It is shown that due to the quantum coherence of atoms in a Bose–Einstein condensate, the width of gamma lines of the long-lived metastable states of isomeric nuclei in these atoms can be close to the natural radiative width. This opens up the possibility of observing super-narrow gamma lines, which are narrower by a few orders of magnitude than the Mössbauer gamma line.