The reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}+{}_{}{}^{12}{}_{}{}^{}\mathrm{C}\to {\alpha }_1+{}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}_{}^{*}{}_{}{}^{}\to {\alpha }_2+{}_{}{}^{16}{}_{}{}^{}\mathrm{O}\mathrm{g}.\mathrm{s}.\mathrm{}$ was employed in the measurements of the spin of highly excited states in ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$. Coincidence angular correlations were obtained using two position-sensitive detectors. The spin and parity of four new levels were determined to be: $9^{-}$ (15.18 ± 0.04 MeV), $5^{-}$ (15.9 ± 0.04 MeV), $8^{+}$ (15.9 ± 0.04 MeV), and $7^{-}$ (18.10 ± 0.04 MeV). The two levels $5^{-}$ and $7^{-}$ may belong to the $K=0^{-}$ band of the (86) S${\mathrm{U}}_3$ symmetry arising from three-particle core excitation, while the $8^{+}$ level may be a member of the [220] "quartet" configuration. Results obtained from the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}({}_{}{}^6{}_{}{}^{}\mathrm{Li},d){}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}({}_{}{}^7{}_{}{}^{}\mathrm{Li},t){}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ experiments are also presented and discussed.

• Received 21 December 1971

DOI:https://doi.org/10.1103/PhysRevC.5.1995