Atomic Beam Study of the Hyperfine Structure of Thulium-170

The atomic-beam magnetic-resonance technique has been used to measure atomic and nuclear quantities of the 129-day isotope Tm¹⁷⁰ as follows: J=7/2, gJ=1.14122±0.00015, $I=1$, |A|=200±3 Mc/sec, and |B|=1010±15 Mc/sec. The values of J and gJ are consistent with the ground-state assignment ²F7/2. Values of the nuclear moments are calculated from the hyperfine-structure interaction constants A and B by use of a two-parameter radial wave function, in which one parameter is determined from comparison with Hartree functions and the other parameters from the experimental spin-orbit coupling constant. Uncorrected values are obtained, as follows: |μI|=0.26±0.02 nm and |Q|=0.61±0.05 barn, with the two moments of the same sign. The same wave function is used to calculate the relativistic and diamagnetic corrections to the atomic g value, and the result is in excellent agreement with the experiment.