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

par De Witte, Hans;De Smet, A.;Eeckhaudt, Stéphane;Górska, Magda;Huyse, Mark;Van De Vel, Karen;Van Duppen, Piet;Andreyev, Andrei;Borzov, Ivan ;Caurier, Etienne;Cederkäll, Joakim;Fedosseev, Valentine V.N.;Franchoo, Serge;Köster, Ulli;Weissman, Leo;Fedorov, Dmitry;Huber, Gerhard;Grawe, Hubert;Janas, Zenon;Kurcewicz, W.;Kurpeta, J.;Płochocki, A.
Référence Physical review. C. Nuclear physics, 69, 4, page (044305-1-044305-6), 044305
Publication Publié, 2004-04

Article révisé par les pairs

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Résumé :

The neutron-rich isotope 218Bi 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 β decay is studied for the first time. A half-life of 33(1)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 218Po, and a deexcitation pattern of stretched E2 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.