Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Astroparticle Physics I

HK 26.5: Vortrag

Dienstag, 27. Februar 2018, 18:15–18:30, HZO 100

Studies of the nucleosynthesis ¹²C(α,γ)¹⁶O in inverse kinematic for the MAGIX experiment on MESA — •Stefan Lunkenheimer — Institut für Kernphysik der Universiät Mainz

MAGIX is a versatile fixed-target experiment and will be built on the new accelerator MESA (Mainz Energy-Recovering Superconducting Accelerator) in Mainz. The accelerator will deliver polarized electron beams with currents up to 1 mA and energy up to 105 MeV. Using its internal gas-target, MAGIX will reach a luminosity of O(10³⁵ cm⁻²s⁻¹). This allows to study processes with very low cross section at small momentum transfer in a rich physical program.

We will present the planned measurements of the inverse kinematic of the nucleosynthesis process ¹²C(α,γ)¹⁶O to determine its S-factor. In the experiment we will scatter electrons on oxygen atoms and we will detect the scattered electrons in coincidence with the produced α-particles. With this measurement we will determine the cross section as a function of the outgoing center of mass energy of the carbon-α-system to calculate the S-factor. Hereby we will present the results of the first simulations which can be used to understand the parameter range that MAGIX will be able to explore.