Studies of the $^{16}\mathrm O(\gamma^*,\alpha)^{12}\mathrm C$ reaction for astrophysical relevance at MAGIX/MESA

MAGIX is a versatile fixed-target experiment and will be operated at the new electron accelerator MESA (Mainz Energy-Recovering Superconducting Accelerator) in Mainz. The accelerator will deliver (un)polarized electron beams with currents up to $1\,\mathrm{mA}$ at $105\,\mathrm{MeV}$. Using its internal gas-target, MAGIX will reach a luminosity of $\mathcal{O}$$({10}^{35}\,\mathrm{cm}^{-2}\mathrm{s}^{-1})$. This allows to study processes with very low cross section at small momentum transfer in a rich physical program. \\[2ex] The nucleosynthesis process $^{12}\mathrm C(\alpha,\gamma)^{16}\mathrm O$ has a high astrophysical relevance. At MAGIX, an experiment is planned to determine the S-Factor of this reaction by measuring the inverse reaction $^{16}\mathrm O(\gamma^*,\alpha)^{12}\mathrm C$. Therefore electrons will be scattered inelastically on oxygen atoms, the scattered electrons and the produced $\alpha$-particles are detected in coincidence. The cross section will be determined as a function of the outgoing center of mass energy of the carbon-$\alpha$-system for the calculation of the S-factor. In this talk the experimental setup and the results of the current simulations are discussed. Furthermore, the accessible parameter range at MAGIX is specified.