Nuclear Electric Field Gradient and Mean-Square Displacement Tensors in Tellurium Metal

The M\"ossbauer effect in Te single-crystal absorbers was studied along different crystal axes. Area ratios of the quadrupole doublet were used as an experimental parameter to extract the electric field gradient and mean-square displacement tensors. Experimental data, taken at the temperature of liquid helium, are well fitted by collinear principal axes for the electric field gradient and mean-square displacement tensors. The quadrupole splitting, asymmetry parameter, and mean-square displacement parameters are ΔEq=7.74±0.10 mm/sec, η=0.64±0.04, 〈x²〉=〈y²〉=〈z²〉=(1.6±0.05)λ².