Abstract
In experiments employing fast ion-guide-based on-line mass separation we have identified six new, rare nuclides of highly refractory elements produced in the fission of by 20-MeV protons. The new isotopes , , , , , and were identified through (β, x-ray) coincidences and β-delayed γ decay. The observed β half-lives range from 130 ms to approximately 1 s. All our recent β half-life data are compared with predictions of the deformed quasirandom-phase-approximation model. The main uncertainty is found to be the inaccuracy of the decay energy predictions.
- Received 17 April 1992
DOI:https://doi.org/10.1103/PhysRevLett.69.1167
©1992 American Physical Society