Abstract
The new neutron-deficient nuclide Ac was produced by bombarding a Lu target with 5.5 MeV/nucleon Ar ions. The evaporation residues were separated in flight by a gas-filled separator and subsequently identified by the - position and time correlation method. Ac was found to have two particle emitting isomeric levels with half-lives of (22 ms and (33 ms, and with particle energies of (779030) keV and (775020) keV, respectively. The former isomer is tentatively assigned to a level and the latter to a level, both of which are also seen in the daughter and granddaughter nuclides Fr and At. Improved values of ms and (769325) keV for the half-life and particle energy of Ac are also reported.
- Received 18 September 1997
DOI:https://doi.org/10.1103/PhysRevC.57.417
©1998 American Physical Society