Abstract
In the bombardment of a target with ions, we observed two identical decay sequences of genetically linked events, each consisting of an implanted heavy atom, two subsequent α decays, and terminated by a spontaneous fission. The measured α energies and corresponding half-lives of the sequential chain members were and for the spontaneous fission the total energies deposited in the detector array were and The decay properties of the synthesized nuclei are consistent with the consecutive α decays originating from the parent even-even nucleus produced in the -evaporation channel with a cross section of about 1 pb. and are the heaviest known α-decaying even-even nuclides, following the production of and and the observation of α decay of The observed radioactive properties of and the daughter nuclides match the decay scenario predicted by the macroscopic-microscopic theory.
- Received 1 February 2000
DOI:https://doi.org/10.1103/PhysRevC.62.041604
©2000 American Physical Society