Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 55: Invited Talks V
HK 55.2: Hauptvortrag
Donnerstag, 31. März 2022, 11:30–12:00, HK-H1
From outer space to deep inside: nuclear physics prospects at MAMI and MESA — •Michaela Thiel — Institut für Kernphysik, JGU Mainz
The Equation of State (EoS) links together fundamental properties of nuclear matter. Heavy nuclei, though orders of magnitude smaller than neutron stars, are governed by the same underlying physics, which is enshrined in the EoS. An accurate and model-independent determination of the neutron-skin thickness of heavy nuclei, using parity-violating electron scattering, will provide significant constraints on the density dependence of the nuclear symmetry energy, a key parameter of the EoS. Within the scope of the P2 experimental setup at MESA, the Mainz Radius EXperiment (MREX) will determine the neutron-skin thickness of 208Pb with ultimate precision. For the interpretation of this and future parity-violation measurements at the precision frontier, theoretical predictions with uncertainties below those of the experiments are required. To that end it is mandatory to go beyond the one-photon exchange approximation and include higher-order corrections. Corresponding measurements of the beam-normal single spin asymmetry An, an observable sensitive to two-photon exchange processes, are essential to benchmark such calculations. A comprehensive systematic study of the Q2 and Z dependence of An in the mass regime 12C to 90Zr at MAMI, using the A1 spectrometer setup, has laid an excellent foundation for the near-future parity-violation measurement program at MESA. Status and prospects of the projects will be presented. (Talk will be given on behalf of the A1 and P2 collaborations)