Orientation of the oxygen-induced non-axially symmetric electric field gradient at181Ta in Ta |
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Authors: | U. Wrede R. Schumacher R. Vianden |
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Affiliation: | 1. Institut für Strahlen-und Kernphysik der Universit?t Bonn, Bonn, FRG
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Abstract: | The interaction of dilute181Ta in Ta with interstitial oxygen has been investigated via the γ-γ TDPAC-technique applied to the 482 keV state in181Ta. The trapping of Oxygen leading to a quadrupole interaction frequency νQ=580(5) MHz with an asymmetry parameter of η-0.37 (1) has been observed after melting the radioactive parent isotope181Hf with Ta. The temperature dependence of the quadrupole interaction frequency between 17 K and 293 K was found to be very weak whereas η varied by about 10%. In a single crystal experiment the orientation of the three principal axes of the electric field gradient leading to νQ was determined. The Vzz-axis points in <110>, the Vyy-axis in <100> and the Vxx-axis in <110> direction. These results can be understood in the charge cloud model, suggested by Wrede et al. /1/ for a similar situation found in the HfNb system. |
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