Time differential ~(57)Fe Moessbauer spectrometer with unique 4π YAP:Ce 122.06 keV gamma-photon detector

摘要

This paper presents a conceptually new design of the ~(57)Fe Time Differential M6ssbauer Spectrometer (TDMS) with the gamma-photon detector optimized for registration of a radiation emitted in a maximum solid angle. A high detection efficiency of 80% in 4π region was achieved for 122.06 keV photons emitted from ~(57)Co source. Detector parameters have been optimized for the use in the Time Differential Mossbauer Spectroscopy where the high time resolution in range of 176-200 ns is highly required. Technical concept of the TDMS is based on the virtual instrumentation technique and uses fast digital oscilloscope. Performance and detector utilization have been clarified by decreasing the Moessbauer spectral line-width of K_2MgFe(CN)_6 reference sample from 0.33 mm/s (integral mode) to 0.23 mm/s (time differential mode). This report also describes characterization and utilization of the detector together with additional electronic blocks and two-channel fast data-acquisition system construction.