Ground-state <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> -decay spectroscopy of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ta</mml:mi><mml:mprescripts /><mml:none /><mml:mn>187</mml:mn></mml:mmultiscripts></mml:math>

Beta-decay spectroscopy of the $^{187}\mathrm{Ta}$ ground state was performed at KEK Isotope Separation System. $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ rays corresponding to previously reported in-beam transitions were observed. The $\ensuremath{\beta}$-decay half-life determined be 283(10) s by analyzing a time spectrum $\ensuremath{\beta}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence events. branching ratio and log($ft$) values evaluated for first time. Based on newly $&gt;6.0$ decay scheme, spin-parity ${I}^{\ensuremath{\pi}}=7/{2}^{+}$ originating from odd-proton orbit $\ensuremath{\pi}7/2[404]$ assigned with high confidence, which is consistent systematics neighboring odd-$A$ nuclides.