New high - spin states of 142 58 Ce and 140 56 Ba from fusion - fission reactions : Proton excitations in the N = 84 isotones
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چکیده
High-spin states in the Ce and Ba nuclei have been populated in the C + U and O + Pb fusion-fission reactions at 90 MeV and 85 MeV bombarding energy, respectively. The emitted γ-radiation was detected using the Euroball III and IV arrays. The high-spin yrast and near-to-yrast structures of Ce have been considerably extended. The level scheme of Ba has been extended by six new levels. The newly observed structures in these N = 84 isotones are discussed by analogy with the neighbouring nuclei. PACS. 21.10.Re.-k Properties of nuclei; nuclear energy levels – 21.10.Re Collective levels – 23.20.Lv Gamma transitions and level energies – 27.60. +j 90 ≤ A ≤ 149
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تاریخ انتشار 2008