Yield measurements for resonances above the multi-αthreshold in20Ne

Abstract

The reaction ${}^{16}$O($\ensuremath{\alpha},{}^{20}\text{Ne}$), has been studied with beam energies from 23.0 to 29.0 MeV in 100-keV steps. Resonant states in ${}^{20}$Ne have been populated which are above the multi-$\ensuremath{\alpha}$ decay threshold and that decay via ${}^{8}$Be + ${}^{8}$Be + $\ensuremath{\alpha}$ and ${}^{8}$Be + ${}^{12}$C$({0}_{2}^{+})$. An array of four silicon-strip detectors was used for the detection of four of the five emitted $\ensuremath{\alpha}$ particles, enabling the full reconstruction of the kinematics. The normalized yields have been obtained, with indications of significant strength above 24.5 MeV arising from several possible resonances.