Abstract
We have investigated the \ensuremath{\beta} decay of the $T=0,$ ${T}_{1/2}\ensuremath{\approx}2.2\mathrm{s},$ isomeric level in the self-conjugate odd-odd nucleus ${}^{70}\mathrm{Br}.$ The observed \ensuremath{\beta}-delayed \ensuremath{\gamma} rays in the daughter nucleus ${}^{70}\mathrm{Se}$ and the deduced decay properties of the isomeric level allow, in conjunction with results from the deformed shell model, a spin and parity assignment of ${J}^{\ensuremath{\pi}}{=9}^{+}$ and suggest a structure of ${\ensuremath{\pi}[404]{9/2}^{+}\ensuremath{\nu}[404]{9/2}^{+}}{9}^{+}.$ The allowed unhindered \ensuremath{\beta} decay of the isomer, possibly oblate deformed, proceeds to four-quasiparticle states in ${}^{70}\mathrm{Se}.$
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