TDPAC of γ-Rays Emitted from ¹¹¹Cd(←¹¹¹In) in α-Fe₂O₃

Abstract

Time differential perturbed angular correlation (TDPAC) of γ-rays emitted from ¹¹¹Cd(←¹¹¹In) doped in α-Fe₂O₃ was measured. The spectrum observed at 420°C was analyzed well with a unique set of a hyperfine magnetic field and an electric field gradient. Conversely, the one observed at 20°C was analyzable only by introducing a distribution to a certain hyperfine parameter because of the after-effects of the preceding EC decay. Electric field gradient for the excited ions after the EC decay seems to be somewhat different from that for the stable ions. The disappearance of the after-effects at 420°C means that the strongly temperature dependent lifetime of the excited ions is very short at this temperature. The present results show that TDPAC using nuclides arising from EC decays can be useful in studying insulators by making a high temperature measurement.