W. Leitz

Temperature dependence of the quadrupole interaction of67Ge and67Zn in s-p metals

The temperature dependence of the electric quadrupole interaction was measured on the 9/2+ isomeric state of67Ge in metallic Zn, Cd, In, and Sn and on the 9/2+ isomeric state of67Zn in Cd metal. For all investigated systems, the temperature dependence reproduces very well aT1.5-relation. The analysis shows that the strength of the temperature dependence in the pure metals is correlated to 1/(M θD2) (θD=Debye-temperature). This favours lattice vibrations as the main component of the temperature dependence of the electric field gradient. The strength of the temperature dependence measured on an impurity atom generally differs from the value of the pure host. Possible explanations for this effect are discussed.

The half-lives of the first and second excited states in 66Ga

Abstract The half-lives of the first and second excited states at 43.9 and 66.3 keV in 66 Ga were determined by measuring the time dependence of the 43.9 and 22.4 keV γ-transition intensities. The levels in 66 Ga were populated by the 66 Za(p, n) 66 Ga and 63 Cu(α, n) 66 Ga reactions. The results are T 1 2 (43.9 keV) = 16(4) ns and T 1 2 (66.3 keV) = 23(2) ns. A g -factor measurement reported in the literature is reanalysed.

Probe specific temperature dependence of the quadrupole interaction of 67Ge in zinc metal

Abstract The quadrupole interaction of the isomeric 9 2 + state of 67Ge was studied in zinc metal as a function of temperature by the DPAD method following the reaction 64Zn(α,n)67Ge. The temperature dependence differs from that of a Zn probe in zinc metal.

Electric quadrupole interaction of recoil-implanted zinc in cadmium

The electric quadrupole interaction of the 605 keV 9/2+ state of 67Zn in Cd metal was measured by the recoil implantation technique combined with the DPAD method (DIMPAD). The result, νQ = eQVZZ/h = 39.0(4) MHz (T = 373 K), is compared with the known quadrupole coupling constants in the Zn-Cd system.

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(α, 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.

Magnetic moment of the 2− state in 92Nb

Abstract The g-factor of the [π(2 p 1 2 ) 1 v(2 d 5 2 ) 1 ] 2 − state in92Nb(τ = 6.2 μsec) was determined by means of perturbed angular distribution methods using the 92Zr(p, n)92Nb reaction in a liquid alloy. The extracted v( d 5 2 ) magnetic moment is discussed in terms of the core-polarization effect.