<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay scheme of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Te</mml:mi><mml:mprescripts /><mml:none /><mml:mn>140</mml:mn></mml:mmultiscripts></mml:math>to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">I</mml:mi><mml:mrow /></mml:mrow><mml:mprescripts /><mml:none /><mml:mn>140</mml:mn></mml:mmultiscripts…

We report for the first time the $\ensuremath{\beta}$-decay scheme of $^{140}\mathrm{Te}$ ($Z=52$) to $^{140}\mathrm{I}$ ($Z=53$), with a specific focus on the Gamow-Teller strength along $N=87$ isotones. These results were obtained in an experiment performed at the Radioactive Ion Beam Factory (RIBF), RIKEN, where the parent nuclide, $^{140}\mathrm{Te}$, was produced through the in-flight fission of a $^{238}\mathrm{U}$ beam at 345 MeV per nucleon impinging on a $^{9}\mathrm{Be}$ target. Based on data from the high-efficiency $\ensuremath{\gamma}$-ray spectrometer, EUROBALL-RIKEN Cluster Array (EURICA), we constructed a decay scheme of $^{140}\mathrm{I}$. The half-life of $^{140}\mathrm{Te}$ has been determined to be 350(5) ms. A level at 926 keV has been assigned as a (${1}^{+}$) state based on the $logft$ value of 4.89(6). This (${1}^{+}$) state, commonly observed in odd-odd nuclei, can be interpreted in terms of the $\ensuremath{\pi}{h}_{11/2}\ensuremath{\nu}{h}_{9/2}$ configuration formed by the Gamow-Teller transition between a neutron in the ${h}_{9/2}$ orbital and a proton in the ${h}_{11/2}$ orbital. We observe a sharp contrast to this type of $\ensuremath{\beta}$-decay branching to the lower-lying ${1}^{+}$ states between $^{140}\mathrm{I}$ and $^{136}\mathrm{I}$, where we see a large reduction as the number of neutrons increases. This is in contrast to the prediction by large-scale shell model calculations. To investigate this type of the suppression, results of the Nilsson model calculations will be discussed. Along the isotones with $N=87$, we discuss a characteristic feature of the Gamow-Teller distributions at ${1}^{+}$ states with respect to the isospin difference.