Compound-nucleus cross sections from heavy-ion reactions are here parametrized by two terms: one for the compound nucleus and one for the entrance channel. The former is simply based on A^^^h the latter involves the tails of the nuclear charge-density distributions for the projectile and target. Excellent agreement is obtained with a wide range of experimental excitation functions. No parameter adjustments, even between the lightest and heaviest systems, are necessary.

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Multiple superdeformed rotational bands have been identified in a nucleus for the first time. Cascades of 14, 13, and 11 transitions have been assigned to three bands in 153 Dy. Despite the small intensities, it has been possible to follow the decay of these bands from an angular frequency of 0.7 down to 0.4 MeV/ft. In all three cases, the dynamic moment of inertia J (2) is nearly constant. Assignments to high-TV intruder orbitals are suggested through comparison of these values of J (2) with theoretical calculations based on the cranked shell model.

Wavelengths of the fine structure transitions 2s 2 S 1/2 -2p 2 P 3/2 and 2s 2 S 1/2 -2p 2 P 1/2 in lithiumlike Ag 44ϩ have been measured using beam-foil excitation and grazing incidence spectroscopy. The respective transition wavelengths of 40.829Ϯ0.004 Å and of 124.685Ϯ0.009 Å were not measured before for this ion. The achieved precision of 70 ppm for the 1/2-1/2 transition allows for a 0.2% QED test which sets a new benchmark in the medium Z range. Our experimental uncertainty is smaller than calculated two-photon exchange contributions to the transition energy. A summary of all published experimental data along the isoelectronic sequence for Z у24, including our recent results for Ni 25ϩ and Zn 27ϩ , is presented and compared with the best available calculations.

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