Quadrupole moments and mean square charge radii in the bismuth isotope chain

Abstract

Isotope shifts and hyperne structures of the 205;206;208;210;210m;212;213 Bi isotopes have been studied on the 306.7nm line using gas cell laser spectroscopy. The neutron{ rich isotopes are the rst isotones of Pb to be measured immediately above the N=126 shell closure. The ground state quadrupole moments of the even{N isotopes increase as neutrons are added or removed from the N=126 shell, but no corresponding increase is observed in the charge radii.

High-precision mass measurements of 203-207Rn and 213Ra with SHIPTRAP

“…The S 2n values derived from the experimental results between N = 114 and N = 126 including our work for the neutron-deficient Rn isotopes follow this trend nicely. This indicates that the deformation of the radon nuclei with four additional protons compared to Pb, with the magic proton number Z = 82, is comparable to those of the Pb isotopes [36], which confirms the results of previous investigations [37].…”

Nuclear moments and charge radii of bismuth isotopes

“…For some isotopes insufficient hyperfine components were resolved for a unique parameter determination and reference to other atomic or nuclear data was required to help constrain the fitting. The higher accuracy determinations of the 207,208,209 Bi parameters from the atomic beam measurements have been combined with the earlier gas cell data analysis [3]. Particular details of the analysis for each isotope and comments on comparisons with previous results are presented below.…”

“…The work has been carried out at the ISOLDE facility, CERN. Some preliminary results of this collaboration have been reported by Kilgallon et al [3]. Two techniques have been employed.…”

The isotope shift of by collinear ion - laser beam spectroscopy

“…Even if available the inclusion of all higher order deformation effects in the macroscopic approximation above may still not be sufficient to describe the observed charge radial behaviour. Recent measurements in the vicinity of the doubly-magic 208 Pb system [25] have demonstrated the failings of purely macroscopic descriptions in near-spherical regions around shell closures. The inability of measured β 2 2 deformations to account for the shapes of neutron-rich Sr, Zr and Mo and the neutron-deficient Sr isotopes near stability [4] is observed in a region which is structurally similar to that around 208 Pb.…”