Single particle signatures in high-spin, quasicontinuum states in Hg-193,Hg-194 from g-factor measurements

The average g factors of high spin, high-excitation energy, quasicontinuum structures in Hg-194,Hg-193 were measured by observing the precessions of t he angular distributions of gamma-ray transitions in several normal-deforma tion bands that coalesce in the decay of the entry distribution of states. The average g factors of the states leading to the three main hands in the Hg-193,Hg-194 isotopes were: (g(Hg-193)) = +0.19(1) and (g(Hg-194)) = +0.26 (1), respectively. These average g factors are smaller than the average of the g factors of the high energy states in the three superdeformed bands of Hg-194, (g(SD;Hg-194)) = +0.41(8). While the nucleus in the superdeformed well behaves like a rigid rotor, the present results demonstrate the import ant role played by multiple, quasiparticle neutron configurations in the st ructure of normal-deformation, highly-excited nuclear states. (C) 1999 Else vier Science B.V. All rights reserved.