G-factors of rotational states in 176Hf, 177Hf, and 180Hf

Abstract

g-factors of rotational states in 176Hf and 180Hf were measured with the twelve detector IPAC-apparatus of our laboratory [1]. The natural radioactivity 3.78 · 1010y 176Lu and the 5.5 h isomer 180mHf were used which populate the ground-state rotational bands of 176Hf and 180Hf. The integral rotations of γ-γ directional correlations in strong external magnetic fields and in static hyperfine fields of (Lu → Hf)Fe2 and HfFe2 were observed. The following results were obtained: Open image in new window The hyperfine field in (Lu → Hf)Fe2 was calibrated by observing the integral rotation of the 9/2− first excited state of 177Hf populated in the decay of 6.7d 177Lu. The g-factor of this state was redetermined in an external magnetic field as Open image in new window Finally the g-factor of the 2 1 + state of 176Hf was derived from the measured g(2 1 + ) of 180Hf by use of the precisely known ratio g(2 1 + , 176Hf)/g(21 +, 180Hf) [2] as Open image in new window