Measurement of the half-life for two 57Fe excited states by a single-crystal scintillation time spectrometer

Half-lives measurements for two excited states of 57Fe located at 14.4 and 136.5 keV, in the 57Fe nucleus have been recently proposed using the Autocorrelation single-crystal scintillation time spectrometer (ASCSTS) .We have proved that ASCSTS has a reasonably high detection efficiency for γ–γ coincidences in the energy range around 5 keV, preserving its main distinctive feature: a large detection solid angle (close to 2π) in a wide time interval (from ∼4 ns to 100 μs).