We have measured de-excitation $\gamma$ rays in ${}^{249}\mathrm{Cm}$ populated by one-neutron stripping reactions with a ${}^{248}\mathrm{Cm}$ target and 162-MeV ${}^{16}\mathrm{O}$, 162-MeV ${}^{18}\mathrm{O}$, and 120-MeV ${}^{13}\mathrm{C}$ beams. $\gamma$ rays in ${}^{249}\mathrm{Cm}$ were identified by measuring kinetic energies of outgoing particles using Si $\Delta E\text{−}E$ detectors. It was demonstrated that high-$j$ orbitals were selectively populated in the (${}^{16}\mathrm{O}$, ${}^{15}\mathrm{O}$) reaction having a large negative $Q$ value. We have observed eight quasiparticle states above the deformed shell gap of $N=152$. The $1/2^{+}[620]$, $1/2^{-}[750]$, and $7/2^{+}[613]$ bands were extended up to $19/2^{+}$, $19/2^{-}$, and $13/2^{+}$ states, respectively. We have established the $9/2\hspace{0.5em}9/2^{+}[615]$ state at 526 keV, the $9/2\hspace{0.5em}9/2^{+}[604]$ state with a short life of $T_{1/2}\ll 2$ ps at 1030 keV, and the $11/2\hspace{0.5em}11/2^{-}[725]$ state with $T_{1/2}=19(1)$ ns at 375 keV. Furthermore, the $17/2\hspace{0.5em}{1/2}^{+}[880]$ state, having a large component of the $k_{17/2}$ spherical single-particle state, has been identified at 1505 keV. We discuss the properties of those quasiparticle states in the framework of a deformed shell model.

• Received 21 September 2008

DOI:https://doi.org/10.1103/PhysRevC.78.054309