Hyperfine structure and isotope shift of theD2line ofRb76−98and some of their isomers

Abstract

Hyperfine structure, spin, and isotope shift measurements have been performed on $^{76\ensuremath{-}98}\mathrm{Rb}$ and $^{78,81,82,84,86,90}\mathrm{Rb}^{m}$. The Rb nuclei have been produced either by spallation of Nb or by fission of U by a 600 MeV proton beam. They have been separated in mass before being transformed into a thermal atomic beam which interacts at a right angle with the light from a c.w. tunable dye laser. The charge radii changes deduced from the isotope shifts exhibit shell effects at $N=50$ and deformations at $N=60$, which are discussed.NUCLEAR STRUCTURE $^{76\ensuremath{-}98}\mathrm{Rb}$, $^{78,81,82,84,86,90}\mathrm{Rb}^{m}$. Measured hyperfine constants $A(5s^{2}\mathrm{S}_{\frac{1}{2}})$, $A(5p^{2}\mathrm{P}_{\frac{3}{2}})$, $B(5p^{2}\mathrm{P}_{\frac{3}{2}})$; spins, isotope shifts. Deduced $\ensuremath{\mu}$, $\mathrm{Qs}$, $\ensuremath{\delta} 〈{r}^{2}〉$. High resolution laser spectroscopy on thermal atomic beams.