Abstract
Laser spectroscopy measurements have been carried out on the very neutron-rich tin isotopes with the COMPLIS experimental setup. Using the 5s 25p 2 3 P 0 → 5s 25p6s 3P1 optical transition, hyperfine spectra of 126–132Sn and 125m,127m,129m–131mSn where recorded for the first time. The variation of the mean-square charge radius (δ〈r 2〉) between these nuclei and nuclear moments of the isomers and the odd isotopes were thus measured. An odd-even staggering which inverts at A = 130 is clearly observed. This indicates a small appearance of a plateau on the δ〈r 2〉 which has to be confirmed by measuring the isotope shift beyond A = 132.
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