The previous experimental data on β-delayed proton decays of ${}^{142}\mathrm{Ho}$ and ${}^{128}\mathrm{Pm}$ were compared with a statistical-model calculation. As a result, the spins of both ${}^{142}\mathrm{Ho}$ and ${}^{128}\mathrm{Pm}$ were assigned as 5, 6, or 7. Nuclear potential-energy surface calculations were performed using the Woods-Saxon-Strutinsky method. The calculated results support the assignments of $7^{-}$ to ${}^{142}\mathrm{Ho}$ and $6^{+}$ to ${}^{128}\mathrm{Pm}.$

• Received 28 May 2002

DOI:https://doi.org/10.1103/PhysRevC.66.047302