Time-resolved Mössbauer spectra obtained after 57Mn implantation in Si

A new detector system for the coincidence technique between Mössbauer γ-rays and energetic β-rays originating from 57Mn has been developed for in-beam Mössbauer spectroscopy using 57Mn implantation. This system enables time-resolved Mössbauer measurements of 57Fe at various elapsed times after β−-decay of 57Mn with sufficient quality. We applied this system to the time-dependent measurement of the site distributions of dilute Fe atoms in n-type Si. It was suggested that Fe atoms were already located at substitutional and interstitial positions in Si within a time of about 100 ns after the β−-decay of 57Mn, and that the occupancy ratio between these positions was hardly dependent on the elapsed time after the β−-decay.