The technique of collinear fast-beam laser spectroscopy has been used to measure the isotope shifts of the even-even isotopes of Hg (Z=80) in the mass range 182

The properties of high-spin states in ' At have been studied with the ' Pb( Li, 3ny)' At reaction. In-beam measurements with Ge(Li) detectors of y-ray excitation functions, y-y cc incidences, y-ray angular distributions, and pulsed beam-y timing were made to establish decay schemes, level energies, spin-parity assignments, isomeric lifetimes, and magnetic moments. High-spin states involving three valence protons in the 1h9/2 2f7, 2 or 1i)3/ orbitals were identified. The electromagnetic properties observed in ' 'At were compared with those in the closed-neutron core nucleus "'At to examine the influence of the two neutron holes on the proton structure; microscopic calculations of this influence were carried out in perturbation theory.NUCLEAR REACTIONS 6Pb(6Li, any), El, =29-34 KIeV; measured y-excitations, y-y coincidences, y-W(0), pulsed beam-y timing, perturbed angular distributions; deduced level scheme, y multipolarities, J~, T&i&, B(E2), g factor; perturbation calculations.

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