Zeitschrift für Physik. A, Hadrons and nuclei vol:339 issue:4 pages:533-534
The 191Bi(m,g) --> 187Tl --> 183Au alpha-decay chain has been studied using mass-separated sources. The alpha-branching ratios have been measured. Out of the reduced alpha-decay widths, it is clear that the pi-S1/2 --> pi-S1/3 and pi-h9/2 --> pi-h9/2 transitions are not hindered although they involve strong shape changes.