The mass excesses of the nuclides ${}_{}{}^{121,123,125}{}_{}{}^{}\mathrm{I}$ have been determined to be - 86288.0 ± 21.4 keV, - 87934.3 ± 5.3 keV, and - 88837.9 ± 4.8 keV, respectively, by measuring $Q$ values of the reactions ${}_{}{}^{120-130}{}_{}{}^{}\mathrm{Te}({}_{}{}^3{}_{}{}^{}\mathrm{He},d)$ and ${}_{}{}^{124-130}{}_{}{}^{}\mathrm{Te}(\alpha ,t)$ with a quadrupole-dipole-dipole-dipole magnetic spectrograph. Furthermore, 26 new enery levels in ${}_{}{}^{121}{}_{}{}^{}\mathrm{I}$ have been determined.

NUCLEAR REACTIONS ${}_{}{}^{120-130}{}_{}{}^{}\mathrm{Te}({}_{}{}^3{}_{}{}^{}\mathrm{He},d)$, ${}_{}{}^{124-130}{}_{}{}^{}\mathrm{Te}(\alpha ,t)$, $E=36\mathrm{}$ MeV, measured $Q$ values, mass excesses, level scheme of ${}_{}{}^{121}{}_{}{}^{}\mathrm{I}$.

• Received 2 February 1978

DOI:https://doi.org/10.1103/PhysRevC.17.2253