Abstract
Abstract Evidence for a low-lying octupole vibrational excitation in the superdeformed energy minimum of 196 Pb is presented. High-spin states in this nucleus have been populated in the 170 Er( 30 Si, 4n) 196 Pb reaction. The in-beam γ -ray decay has been investigated using the EUROBALL IV Ge-detector array. The linear polarization of γ -ray transitions connecting an excited superdeformed band with the yrast superdeformed band has been measured from which E1 multipolarity is determined. These E1 transitions, which compete with the highly collective in-band E2 transitions, are strongly enhanced. This is an important step towards establishing that low-lying octupole vibrations are a wide spread phenomenon in the A =190 region of superdeformation.
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