The hyperfine structure splittings (hfs) and isotope shifts (IS) in the atomic transitions 5s 2 5p 2 ~So ~5s 2 5p6s 1.3p~ have been measured for the radioactive isotopes lo8 ~l~Sn and all stable ones. The tin isotopes were prepared as fast atomic beams for collinear laser spectroscopy at the GSI online mass separator following a fusion reaction. Nuclear spins, magnetic dipole, electric quadrupole moments and changes in mean square charge radii have been determined. In a~ the spin I=5/2 was measured for the nuclear ground state (Tt/2= 18 min) in contradiction to the literature value. The mean square charge radii show a parabolic behaviour with a maximum at N = 66. This is interpreted by collective effects, which are considerably stronger than accounted for by the B(E2)values.

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Collinear fast beam laser spectroscopy has been used to measure the hyperfine structure and isotope shift in the atomic 5s 2 5p2p3/2-5s26s2S1/2 transition (2=451nm) of 1~Secondary beams of neutron deficient indium isotopes were prepared at the GSI on-line mass separator following fusion evaporation reactions. Magnetic dipole moments and electric quadrupole moments have been determined. The isotope shifts are discussed in terms of the change of the mean square nuclear charge radii and compared with the droplet model predictions and the deformation values calculated from the quadrupole moments.

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