β-delayedγ-ray spectroscopy of non-yrast states inTe138near the neutron drip line
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Abstract
We report on the first $\ensuremath{\beta}$-decay data of $^{138}\text{Sb}$ to $^{138}\text{Te}$ isotopes beyond the doubly magic $^{132}\text{Sn}$. The parent nucleus was produced by the in-flight fission of a $^{238}\text{U}$ beam on a $^{9}\text{Be}$ target at 345 MeV per nucleon and measured at the BigRIPS separator of the Radioactive Isotope Beam Factory at RIKEN. By using advanced $\ensuremath{\beta}\text{\ensuremath{-}}\ensuremath{\gamma}$ spectroscopy techniques, the half-life and the tentative spin-parity of $^{138}\text{Sb}$ were measured to be 346(19) ms and $({3}^{\ensuremath{-}})$, respectively. In addition, we observed several low-lying non-yrast states in $^{138}\text{Te}$ for the first time. Our data allowed us to rearrange the positions of the first ${2}^{+}$ and ${4}^{+}$ states in this nucleus and to construct the level scheme of $^{138}\text{Te}$ in accordance with shell-model calculations. Additionally, we extend energy systematics of Te isotopes within neutron numbers 54 and 86.
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