Abstract

Spectroscopic studies of the $\ensuremath{\beta}$ decay of ${}^{140}\mathrm{I}$ have firmly established octupole collectivity in ${}^{140}\mathrm{Xe}$ and evinced unique theoretical predictions of a quenched dipole moment. The first detailed investigations of an exotic Xe nucleus, including measurements of half-lives of levels in the ground and octupole bands, were made possible due to a new approach to produce beams of iodine with ISOL sources.

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