Collective structure in ${}^{70}\mathrm{As}$

High-spin states in ${}^{70}\mathrm{As}$ were populated using the ${}^{58}\mathrm{Ni}$ (${}^{16}\mathrm{O},$ $3pn$) reaction at 70 MeV energy. Lifetime measurements of the ${11}^{\mathrm{}(+)\mathrm{}}\to 9^{\mathrm{}(+)\mathrm{}}$ 980.7 keV and ${(13\mathrm{}}^{+})\to {11}^{\mathrm{}(+)\mathrm{}}1342.7\mathrm{keV}$ transitions using the Doppler-shift attenuation method determined that both are enhanced $E2\mathrm{}$ transitions. This measurement indicates the onset of deformation with increasing spin in ${}^{70}\mathrm{As},$ as has been seen in neighboring nuclei.