Collective bands in even mass Sn isotopes |
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Authors: | J Bron WHA Hesselink A Van Poelgeest JJA Zalmstra MJ Uitzinger H Verheul K Heyde M Waroquier H Vincx P Van Isacker |
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Institution: | Natuurkundig Laboratorium van de Vrije Universiteit, De Boelelaan 1081, Amsterdam, The Netherlands;Laboratorium voor Kernfysika, Proeftuinstraat 26, B-9000 Gent, Belgium |
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Abstract: | Positive parity bands in 112, 114, 116, 118Sn have been excited up to levels with spin and parity Jπ = 12+ using Cd(α, 2nγ)Sn reactions. The experiments consisted of γ-ray excitation function, γ-γ coincidence, lifetime, γ-ray angular distribution, γ-ray linear polarization and conversion electron measurements. The observed bands show strong resemblances with ground-state bands of transitional nuclei in this mass region. It is pointed out that the Jπ = 0+ band-heads originate from 2p-2h excitations in the Z = 50 proton shell. The excitation energies of the band-heads are calculated by means of the macroscopic-microscopic renormalization method. Pair correlations between the 2h and 2p configurations are included separately in a phenomenological way by taking into account the pairing energies of the Cd and Te ground states with respect to the Sn ground state. |
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Keywords: | Nuclear Reactions |
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