Nuclear charge radii and nuclear moments of neutron deficient Ba isotopes from high resolution laser spectroscopy

Abstract

Isotope shifts and hyperfine structure of the BaI $6{s}^{2}^{1}S_{0}\ensuremath{-}6s6p^{1}P_{1}$ transitions ($\ensuremath{\lambda}=553.6\mathrm{nm}$) in neutron deficient Ba nuclides ($N<82$) have been investigated by observing the resonance fluorescense in a well collimated atomic beam with a high resolution tunable CW dye laser. The experiments aimed at information on nuclear charge radii and on nuclear moments. Results are presented for the radioactive isotopes and isomers $^{133}\mathrm{Ba}^{g}$, $^{133}\mathrm{Ba}^{m}$, $^{131}\mathrm{Ba}$, $^{128}\mathrm{Ba}$, in addition to remeasurements of all stable Ba nuclides. The extracted values of $\ensuremath{\delta}〈{r}^{2}〉$, the observed odd-even staggering and the nuclear moments are discussed in the light of other theoretical and experimental nuclear structure studies of the region $50\ensuremath{\le}(Z, N)\ensuremath{\le}82$.NUCLEAR STRUCTURE isotope shifts and hyperfine structure $^{133}\mathrm{Ba}^{g}$, $^{133}\mathrm{Ba}^{m}$, $^{131}\mathrm{Ba}$, $^{128}\mathrm{Ba}$, measured by laser spectroscopy, deduced $\ensuremath{\delta}〈{\mathcal{r}}^{2}〉$ and nuclear moments.