Influence of the temperature and the ionisation potential on the hyperfine interaction of 111Cd ions in gaseous radioactive indium‐halides

The hyperfine interaction (HFI) of ¹¹¹Cd in different indium‐halides was studied by perturbed angular correlation (PAC). The ¹¹¹Cd ion arises from a ¹¹¹In by electron capture decay (EC) and joined Auger cascade. Coulomb fragmentation of the indium‐halide molecule produces the free excited ¹¹¹Cd ion. The nucleus decays via a γ–γ‐cascade which is perturbed by the HFI. Collisions of the ¹¹¹Cd ion with indium‐halide molecules can strongly change the perturbation. The perturbation was measured by the attenuation coefficient G₂₂(∞) and G₂₂(t). The molecular densities varied between 10¹⁴ and 10²⁰ cm⁻³. The present article shows the temperature dependence of the indium(III)‐halides and a fit for an empirical basic approach. The investigation of the InBr shows the independence of the attenuation coefficient from the temperature by indium(I)‐halides in contrast to the dependence of the indium(III)‐halides. This revised version was published online in July 2006 with corrections to the Cover Date.