Spins, moments and charge radii of barium isotopes in the range 122–146Ba determined by collinear fast-beam laser spectroscopy

Charge radii of neon isotopes across thesdneutron shell

“…Centroids of all observed peaks were determined by fitting the lines with a convolution of a Lorentzian-shaped resonance and an exponential function. As shown and discussed before [24], this is a realistic model for the line shape, accounting for the partial energy loss in inelastic channels of the chargetransfer reaction by which the ion beam is neutralized. For any particular hyperfine structure or isotope shift measurement it is important to use common line-shape parameters of all resonances involved.…”

“…Isotope shifts in the transition 3s[3/2] 2 → 3p[3/2] 2 measured for [24][25][26]28 Ne, together with already published data on 17−22 Ne [9] are listed in Table II. The statistical errors of the isotope shifts arise from uncertainties of the resonance positions (even-A isotopes) or the positions of centers of gravity of the hyperfine structure (odd-A isotopes).…”

“…The new results provide information on the structural changes in the sequence of neon isotopes all across the neutron sd shell, ranging from the proton drip line nucleus and halo candidate 17 Ne up to the neutron-rich 28 Ne in the vicinity of the "island of inversion." Within this range the charge radius is smallest for 24 Ne with N = 14 corresponding to the closure of the neutron d 5/2 shell, while it increases toward both neutron shell closures, N = 8 and N = 20. The general trend of the charge radii correlates well with the deformation effects which are known to be large for several neon isotopes.…”

“…Proton-rich 17 Ne is a candidate for a two-proton halo [2,3], cluster structures have been found in 20−22 Ne and 24 Mg [4], and the isotopes around N = 20 make up the so-called island of inversion [5], where a weakening or even disappearance of the neutron magic number is visible.…”

High-accuracy mass determination of unstable cesium and barium isotopes

“…The values for I S 2 have been re-calculated in a uniform way from the mean-square nuclear charge radii di erences hr 2 i obtained from isotope shift measurements and the values of Q 2 from the spectroscopic quadrupole moments Q s presented in Refs. [52], [53], [54] and [55]. The mean-square charge radii di erences hr 2 i were corrected for the contribution of higher radial moments according to the prescription given in [56].…”