Observation of the gamma resonance of a long-lived 109m Ag isomer using a gravitational gamma-ray spectrometer

Abstract

Experiments confirming the previous data on the small real width of the γ resonance of 109m Ag have been performed with a gravitational gamma-ray spectrometer. The achieved resolution is eight orders of magnitude higher than that of Mössbauer spectrometers using gamma rays from a 57Fe nuclide. The theoretically predicted broadening of the Mössbauer gamma line of 109m Ag by five orders of magnitude (due to the dipole-dipole interaction between the magnetic moments of neighboring nuclei) has not been observed.