THE NUCLEAR-QUADRUPOLE INTERACTION OF TA-181 IN THE INTERMETALLIC COMPOUND HF2NI

The time-differential perturbed angular correlation technique has been used to study the electric field gradient at Ta-181 impurities in the intermetallic compound Hf2Ni. The results of the measurements show th e presence of a single nuclear quadrupole interaction. At room tempera ture the frequency of the interaction is omega(Q) = 92(1) Mrad s-1. Th e electric field gradient V(zz) and asymmetry parameter eta exhibit a pronounced temperature dependence in a range varying from 78 to 1125 K .