α-decay characteristics of neutron-deficient 190,192Po nuclei and alpha branching ratios of 186,188Pb isotopes

A. N. Andreyev, N. Bijnens, M. Huyse, P. Van Duppen, M. Leino, T. Enqvist, P. Kuusiniemi, W. Trzaska, J. Uusitalo, N. Fotiades, J. A. Cizewski, D. P. McNabb, K. Y. Ding, C. N. Davids, R. V.F. Janssens, D. Seweryniak, M. P. Carpenter, H. Amro, P. Decrock, P. ReiterD. Nisius, L. T. Brown, S. Fischer, T. Lauritsen, J. Wauters, C. R. Bingham, L. F. Conticchio

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Abstract

By using complete fusion reactions 32S + 164Er and 48Ti + 144Sm, leadingto 196Po and 192Po compound nuclei, improved α-decay characteristics for neutron-deficient 190,192Po isotopes have been obtained. The experiments have been performed at the fragment mass analyzer (Argonne) and at the RITU gas-filled separator (Jyvaskyla). In 192Po the l = 0 decay to the excited 0+ state in 188Pb is two times faster than the decay to the ground state. For 190Po more precise values of the alpha-decay energy Eα = 7545(15) keV and half-life T1/2 = 2.53(33) ms were measured. By using correlated α-decay chains α-branching ratios of 38(9)% and 9.3(8)% were experimentally deduced for the first time for 186Pb and 188Pb, respectively. The reduced α-width systematics is extended for even Po isotopes, confirming a persistence of the saturation towards the lighter isotopes. Absence of any anomalies in the reduced α-widths for the neutron-deficient Pb isotopes is confirmed.

Original languageEnglish (US)
Pages (from-to)835-837
Number of pages3
JournalJournal of Physics G: Nuclear and Particle Physics
Volume25
Issue number4
DOIs
StatePublished - Apr 1999

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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