The decay of the new neutron-rich isotope ~(217)Bi

摘要

Exotic, neutron-rich proton-induced spallation products of ~(232)Th and ~(238)U obtained from the PS Booster ISOLDE facility have been investigated by γ-γ, α-γ coincidence and spectrum-multiscaling measurements. A new method for the reduction of isobaric contamination enabled to study the unknown region beyond ~(208)Pb for the decay chain a = 217. A new isotope ~(217)Bi with a half-life of 98.5 ± 0.8 s was discovered and its β-decay studied. For the first time, a half-life value of 1.53 ± 0.03 s for the α-decay of ~(217)Po was measured.