Hwa-Suck Cho1, J. H. Park1, T. P. Das2
1 Department of Physics, Yeungnam University, Kyungsan
2 Department of Physics, SUNY at Albany, Albany, NY, 12222
Using the Hartree-Fock cluster procedure, we have studied the electric field gradient tensors at the nuclei of 77Se and 125Te in both selenium and tellurium crystalline systems. From the results for 77Se in selenium and 125Te in tellurium, combined with the observed quadrupole coupling constants, we have determine the values of the quadrupole moments Q (77Se)=0.74±0.07 barns and Q (125Te)=0.35±0.04 barns. Comparison will be made with earlier values obtained by different methods. Our calculated values of Q and the theoretical field-gradient tensors for 77Se in tellurium and 125Te in selenium lead to quadrupole coupling constants in agreement within about 15 percent with experiment, the calculated asymmetry parameter for 77Se in tellurium also being in reasonable agreement with experiment. Experimental results of the asymmetry parameter of 125Te in selenium would be helpful to have to make comparison with theory.
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