The ${\mathit{T}}_{\mathit{Z}}$=-3/2, A=4n+1 nuclide ${}_{}{}^{65}{}_{}{}^{}\mathrm{Se}$ produced in the ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$${(}^{28}$Si,3n) reaction has been observed via beta-delayed proton emission. A single proton group at 3.55±0.03 MeV has been observed, corresponding to the decay of the T=3/3 isobaric analog state in ${}_{}{}^{65}{}_{}{}^{}\mathrm{As}$ to the ground state of ${}_{}{}^{64}{}_{}{}^{}\mathrm{Ge}$. Combining this measurement with a Coulomb displacement energy calculation yields a mass excess for ${}_{}{}^{65}{}_{}{}^{}\mathrm{Se}$ of -33.41±0.26 MeV.

• Received 8 January 1993

DOI:https://doi.org/10.1103/PhysRevC.47.2038