Charge Radii Measurements of Exotic Tin Isotopes in the Proximity of N=50 and N=82

Abstract

We report nuclear charge radii for the isotopes Sn104–134, measured using two different collinear laser spectroscopy techniques at ISOLDE-CERN. These measurements clarify the archlike trend in charge radii along the isotopic chain and reveal an odd-even staggering that is more pronounced near the N=50 and N=82 shell closures. The observed local trends are well described by both nuclear density functional theory and valence space in-medium similarity renormalization group calculations. Both theories predict appreciable contributions from beyond-mean-field correlations to the charge radii of the neutron-deficient tin isotopes. The models, however, fall short of reproducing the magnitude of the known B(E2) transition probabilities, highlighting the remaining challenges in achieving a unified description of both ground-state properties and collective phenomena.