REORIENTATION EFFECT MEASUREMENTS OF EVEN MERCURY ISOTOPES

Reorientation effect and multiple Coulomb excitation measurements have been performed for198, 200, 202, 1204Hg. By measuring particle spectra after Coulomb excitation of an enriched198Hg target with4He and16O beams, a positive quadrupole moment of Q2 = 0.66±0.18 eb (for negative interference) or Q2=0.80±0.18 eb (for positive interference) and B(E2,0→2)=0.991±0.006 e2b2 were obtained. All other B(E2) values and quadrupole moments were determined relative to these numbers from precise γ-ray yields obtained from Coulomb excitation of a frozennatHg target with4He and16O projectiles. Oblate shapes of all Hg isotopes were found. The data have been interpreted in terms of triaxial rotation and anharmonic vibrations. © 1979 Springer-Verlag.