Abstract
The -delayed proton precursors , and near the proton drip line were produced by the irradiation of , and with an beam, and definitely identified for the first time using proton-gamma coincidence in combination with a He-jet tape transport system. Their half-lives were determined to be 0.60(15) s, 1.0(3) s, 0.55(10) s, 2.2(2) s, and 0.6(2) s, respectively. The measured energy spectra of -delayed protons and estimated proton branching ratios to the final states in “daughter” nuclei were fitted by a statistical model calculation, and then the spins and parities of , were preliminarily assigned as , and , respectively. The agreement between the spin-parity assignments and the predicted Nilsson diagrams indirectly indicates that the ground states of , are highly deformed with .
- Received 5 April 1999
DOI:https://doi.org/10.1103/PhysRevC.60.061302
©1999 American Physical Society