Elsevier

Nuclear Physics A

Volume 351, Issue 3, 19 January 1981, Pages 490-508
Nuclear Physics A

0+ states and E0 and E2 transition rates in even Sn nuclei

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Abstract

0+ states and their depopulating E0 and E2 transitions have been studied in 112–124Sn. Several methods of γ-ray and electron spectrometry have been employed, including special coincidence techniques for lifetime, conversion electron and double Coulomb excitation measurements. For 114–118Sn the E2 transition probabilities from the first excited 0+states (02+) are about 20 W.u., which is compatible with a vibrational two-phonon character. Also the E0 transition probabilities from these states are within a factor of two from the vibrational values. For the second excited 0+ states (03+) the corresponding E2 and E0 transition probabilities are considerably smaller. A total of 12 E0 transitions have been observed. The 03+ → 02+ transition is observed in 114–120Sn and has in 116Sn a reduced transition probability 1–2 orders of magnitude larger than those of the groundstate E0 transitions, which indicates that the 03+ and 02+ states are strong mixtures of components with different 〈r2〉. The 0+ states in 116Sn are discussed as possible rotational band heads associated with a deformation β2 ≈ 0.2. The Coulomb excitation cross section of the 02+ state is found to be sensitive to an interference term including matrix elements with the 22+ state. The relative sign of this term has been determined.

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