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First observation of the b decay of neutron-rich 218 Bi by the pulsed-release technique and resonant laser ionization

The neutron-rich isotope 218 Bi has been produced in proton-induced spallation of a uranium carbide target at the ISOLDE facility at CERN, extracted from the ion source by the pulsed-release technique and resonant laser ionization, and its b decay is studied for the ﬁrst time. A half-life of 33 s 1 d s was measured and is discussed in the self-consistent continuum-quasi particle-random-phase approximation framework that includes Gamow-Teller and ﬁrst-forbidden transitions. A level scheme was constructed for 218 Po, and a deexcitation pattern of stretched E 2 transitions 8 + ! 6 + ! 4 + ! 2 + ! 0 + to the ground state is suggested. Shell-model calculations based on the Kuo-Herling interaction reproduce the experimental results satisfactorily.