Abstract
The excited states in the neutron-deficient isotopes have been populated using the and reactions at beam energies of 175, 182, and 177 MeV, respectively. Evaporation residues were selected using an in-flight gas-filled separator and implanted at the focal plane into a 16-element position-sensitive, passivated ion-implanted planar silicon detector. Prompt rays were observed at the target position using an array of Compton-suppressed germanium detectors. Correlation with the subsequent radioactive decay of associated recoiling ions in the silicon detector, recoil- and recoil-- coincidences were used to construct decay schemes of light radon isotopes. Measurements of delayed rays at the focal plane have also been made, and microsecond isomers have been observed in but not in Comparison of the results with those for polonium isotopes indicate a common mechanism for the onset of deformation. Candidates have been found in for deformed intruder states which coexist with the spherical ground-state shape.
- Received 19 September 2002
DOI:https://doi.org/10.1103/PhysRevC.66.064321
©2002 American Physical Society