The heavy-ion reactions ($\alpha , 2n$) and (${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, $p2n$) have been used to study by $\gamma$-ray spectroscopy the nuclei ${}_{}{}^{71}{}_{}{}^{}\mathrm{As}$ and ${}_{}{}^{73}{}_{}{}^{}\mathrm{As}$ with emphasis on high-spin states. Spin and parity assignments were made on the basis of coincidence measurements, angular distributions, and excitation functions. Level schemes for ${}_{}{}^{71}{}_{}{}^{}\mathrm{As}$ and ${}_{}{}^{73}{}_{}{}^{}\mathrm{As}$ have been constructed which contain a stretched spin band on a $g_{\frac{9}{2}}$ state.

NUCLEAR REACTIONS ${}_{}{}^{69,71}{}_{}{}^{}\mathrm{Ga}(\alpha , 2n)$, $E_{\alpha }=17-24\mathrm{}$ MeV; ${}_{}{}^{56,58}{}_{}{}^{}\mathrm{Fe}({}_{}{}^{18}{}_{}{}^{}\mathrm{O}, p2n)$, $E_0=40-52.5\mathrm{}$ MeV; measured $E_{\gamma }$, $I_{\gamma }$, $\sigma (E, E_{\gamma })$, $I_{\gamma }\left(\theta \right)$, $\gamma -\gamma$ coincidence; ${}_{}{}^{71}{}_{}{}^{}\mathrm{As}$, ${}_{}{}^{73}{}_{}{}^{}\mathrm{As}$ deduced levels, $J$, $\pi$; enriched targets; Ge(Li).

• Received 29 September 1976

DOI:https://doi.org/10.1103/PhysRevC.15.1742