Energies andJπvalues of resonances inC12(O16,Be8)Ne20reactions

The ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$,${}_{}{}^8{}_{}{}^{}\mathrm{Be}$)${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$* reactions to the low lying $0^{+}$, $2^{+}$, $4^{+}$ and $3^{-}$, $1^{-}$ states have been studied for $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=18.5\mathrm{} \mathrm{to} 22.7$ MeV at intervals of ∼86 keV. Excitation functions indicate the presence of twelve resonances in this energy region, eight of which are given $J^{\pi }$ assignments based on angular distributions of the ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$ + ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$($0^{+}$) channel measured at each energy interval. A high degree of resonance energy correspondence between these and other reaction cross section anomalies is noted. It is apparent that the density of resonant states for the ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$ + ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ exit channel is much higher than reported in other channels.