OPTICAL ISOTOPE SHIFT AND HYPERFINE-STRUCTURE MEASUREMENTS OF GD-152, GD-154-158, GD-160

Laser spectroscopic measurement of the optical isotope shifts of all the naturally occurring Gd isotopes have been made using a collimated atomic beam system. The isotope shift and hyperfine splitting of all the stable isotopes have been measured for five optical transitions of Gd I at 570.135, 574.466, 574.636, 575.188, and 579.138 nm. The data were combined with the available muonic and electronic x-ray isotope shift data to extract the specific mass shift and the field shift constant. The change in charge radii, r2, have been extracted and compared with droplet model predictions. The accuracy of the isotope shift measurements is 0.1% and the extracted charge radius changes have an uncertainty of about 3%. © 1990 The American Physical Society.