Gamma ray linear polarization measurements forAl29

Levels of ${}_{}{}^{29}{}_{}{}^{}\mathrm{Al}$ were populated with the ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}(\alpha , p){}_{}{}^{29}{}_{}{}^{}\mathrm{Al}$ reaction at $E_{\alpha }=11.26\mathrm{}$ MeV. The linear polarizations of $\gamma$ rays emitted in the decays of the 1.40-, 1.75-, 2.22-, and 2.87- MeV levels were measured. The polarization measurements are consistent with known spin-parity assignments for the 1.40- and 2.87-MeV levels, respectively. When combined with previously available information they indicate an assignment of ${\frac{3}{2}}^{+}$ for the 2.22-MeV level and ${\frac{7}{2}}^{+}$ (${\frac{3}{2}}^{+}$) for the 1.75-MeV level.