Nuclear parameters of the 140 keV Mossbauer level in 99Tc from Mossbauer spectroscopy

Mossbauer resonance spectra of the 140 keV transition in 99Tc were measured in a variety of source and absorber combinations over the temperature range from 1.6 to 65 K. The following parameters were obtained from these spectra: Delta (r2) approximately=6*10-3 fm2, T12/(140)=237+or-14 ps and g(140)=1.03+or-0.25.