Zeitschrift für Physik. A, Hadrons and nuclei vol:358 issue:1 pages:63-68
The neutron-deficient Po-190 and Bi-189 isotopes have been produced in the 2n respectively p2n channels of the Ti-48 + Sm-144 reaction. Cross sections for different reaction channels are given. For Po-190, improved values of alpha-energy E-alpha = 7550(15) keV and half-life T-1/2 = 1.9(-0.4)(+0.6) ms were measured. By using correlated alpha-decay chains an alpha-branching ratio of 0.50(25) was deduced for Pb-186. The reduced alpha-width systematic is extended for both of these isotopes, confirming a persistence of the saturation towards the lighter Po isotopes and the absence of any anomalies for the neutron-deficient Pb isotopes. For Bi-189 improved values of E-alpha = 7300(15) keV and T-1/2 = 4.8(5) ms were measured.