Abstract
Very neutron deficient uranium isotopes were produced in fusion evaporation reactions using ions on targets. The gas-filled recoil separator RITU was employed to collect the fusion products and to separate them from the scattered beam and other reaction products. The activities were implanted into a position sensitive silicon detector after passing through a gas-counter system. The isotopes were identified using spatial and time correlations between the implants and the decays. Two -decaying states, with keV and ms for the ground state and keV and ms for an isomeric state, were identified in . In addition, the half-life and -decay energy of were measured with improved precision. The measured decay properties deduced for suggest that there is no subshell closure at .
- Received 9 May 2006
DOI:https://doi.org/10.1103/PhysRevC.75.054307
©2007 American Physical Society