Elsevier

Nuclear Physics A

Volume 318, Issue 3, 23 April 1979, Pages 335-351
Nuclear Physics A

Collective bands in even mass Sn isotopes

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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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    Present address: DESY, Notke strasse 85, 2000-Hamburg, Germany.

    ††

    Aangested navorser of the NFWO.

    IWONL Fellow.

    ‡‡

    Aspirant of the NFWO.

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