The 5298- and 6567-keV states in ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$ have been studied by the reaction ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(\alpha ,\gamma ){}_{}{}^{18}{}_{}{}^{}\mathrm{F}$. Spin assignments have been made of $J^{\pi }=4^{+} \mathrm{and} 5^{+}$, respectively. The energy and spin sequence of the 1702- ($1^{+}$), 2524- ($2^{+}$), 3358- ($3^{+}$), 5298- ($4^{+}$), and 6567-keV ($5^{+}$) states, as well as enhanced $E2\mathrm{}$ strengths of the $\gamma$ transitions between these states, show that these states can be considered to be members of a predominantly four-particle, two-hole $K^{\pi }=1^{+}$ rotational band. A comparison between existing theories is given.

• Received 19 July 1971

DOI:https://doi.org/10.1103/PhysRevLett.27.1007