A recent ${}^{20}$O(d,p) ${}^{21}$O experiment, in reverse kinematics, discovered two new states in ${}^{21}$O at 4.77(10) and 6.17(11) MeV, with $J^{\pi }$ assignments of 3/2${}^{+}$ and of 3/2${}^{+}$ or 7/2${}^{-}$, respectively. Both widths and spectroscopic factors were reported, along with the branching ratio for the upper state to decay to the 2${}^{+}$ state of ${}^{20}$O. We have computed single-particle widths for all the relevant decays and have used them to extract additional information for these two states, including the spectroscopic factors for 2${}^{+}$ decay of the upper state with the two possible $J^{\pi }$ values. Our analysis prefers 7/2${}^{-}$ for $J^{\pi }$.

• Received 8 August 2011

DOI:https://doi.org/10.1103/PhysRevC.85.027305