Interpretation of 108 I as an odd-odd γ -deformed proton emitter

We have interpreted the recent observation [K. Auranen et al., Phys. Lett. B 792, 187 (2019)] of proton emission from $^{108}\mathrm{I}$. We find that $\ensuremath{\gamma}$ deformation is crucial to reproduce the experimental data, and have identified the decaying state as the ${1}^{+}$ state. The effect of the residual $np$ interaction is also discussed. With the present calculation, we establish the first microscopic description of a triaxial odd-odd proton emitter.