Abstract
The hyperfine structure splittings (hfs) and isotope shifts (IS) in the atomic transitions 5s 2 5p 2 1 S 0 → 5s 2 5p6s 1,3 P 1 have been measured for the radioactive isotopes108−111Sn 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. In109Sn the spinI=5/2 was measured for the nuclear ground state (T 1/2=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 theB(E2)-values.
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This work comprises parts of the theses of J. Eberz and H. Lochmann.
The help of C. Bruske, K. Burkard, W. Hüller and all other members of the GSI mass separator group as well as the support of the UNILAC operating crew and the GSI Target Laboratory are gratefully acknowledged.