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

Abstract

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 $\ensuremath{\mu}(^{235}\mathrm{U})=\ensuremath{-}0.38(3){\ensuremath{\mu}}_{N}$ and a determination of the spin density ${a}^{10}(7s)=\ensuremath{-}2880(75)$ MHz of the $7s$ electron.