Time-differential observation of quadrupole interactions following recoil implantation of a Ge-probe into Cd,In, Sn,and Sb

We have measured the quadrupole interactions of excited⁶⁷Ge nuclei in the polyvalent metals Cd, In, Sn, and Sb. The experiments have been performed by the time-differential angular distribution technique, following the reaction⁶⁴Zn(, n)⁶⁷Ge to produce and implant the Ge nuclei into the different metals (DIMPAD). A sandwich target system is used, which allows the application of the DIMPAD-technique for low recoil energies. The extracted electric field gradients are found to depend on the host metal as well as on the solute Ge, an interpretation is suggested on the basis of charge screening effects.