Collinear Laser-rf Double-Resonance Spectroscopy:U235II Hyperfine Structure

A novel technique combining the advantages of the laser-rf double-resonance scheme and fast-beam collinear laser spectroscopy has been applied to a detailed study of the hyperfine structure of ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$ I I. The experimental results are analyzed with use of ab initio Dirac-Fock calculations of the reduced radial parameters of relativistic hyperfine-structure theory. The analysis results in a new value for the nuclear dipole moment $\mu \left({}_{}{}^{235}{}_{}{}^{}\mathrm{U}\right)=-0.38\mathrm{}\left(3\right)\mathrm{}{\mu }_N$ and a determination of the spin density $a^{10}\mathrm{}\left(7s\right)=-2880\mathrm{}\left(75\right)\mathrm{}$ MHz of the $7s$ electron.