Direct measurement of the16O(α,γ)20Ne reaction atEc.m.=2.43MeV and 1.69 MeV

In stars, ${}^{16}$O represents the endpoint of the helium burning sequence due to the low rate of ${}^{16}$O($\ensuremath{\alpha}$,$\ensuremath{\gamma}$)${}^{20}$Ne. We present a new direct measurement of the total cross section of ${}^{16}$O($\ensuremath{\alpha}$,$\ensuremath{\gamma}$)${}^{20}$Ne at ${E}_{\mathrm{c}.\mathrm{m}.}=1.69\phantom{\rule{0.16em}{0ex}}\mathrm{MeV}$ employing the DRAGON recoil separator. In addition, the branching ratios and strength of the ${E}_{\mathrm{c}.\mathrm{m}.}=2.426\phantom{\rule{0.16em}{0ex}}\mathrm{MeV}$ ${3}^{\ensuremath{-}}$ resonance were determined.