Reaching new precision frontiers in nuclear physics brings up new experimental challenges as well as the demand for more sophisticated theoretical calculations. Especially in parity-violation electron scattering experiments the contribution from higher order processes, such as two-photon exchange, is comparable in size with the observed asymmetry $A_{PV}$. Hence, a precise knowledge of this...
The HADES spectrometer is located at the SIS18 accelerator at the GSI Helmholtzzentrum für Schwerionenforschung GmbH in Darmstadt. Recently an electromagnetic calorimeter (ECAL) detector was added to the set-up. The ECAL read-out system is based on the PaDiWa-AMPS Charge-to-Time-over-Threshold front-end board for the Trigger and Read-out Board (TRB) platform. The required discriminators, the...
In heavy nuclei, the distribution of neutrons extends out further than the proton distribution forming a so-called “neutron skin”. An accurate experimental determination of the neutron skin thickness of heavy nuclei would provide a unique constraint on the symmetry energy of the nuclear Equation Of State which strongly depends on poorly constrained three-body forces. Photons have an advantage...
We investigate the complex spectrum of the massive Dirac operator in 2+1-flavor QCD, at nonzero temperature and isospin chemical potential, using the extension of the Banks-Casher relation to the case of Complex Dirac eigenvalues (derived for the zero-temperature, high-density limits of QCD at nonzero isospin chemical potential), as a prescription to obtain information on the BCS gap from the...
The efficient production of cold antihydrogen atoms, at CERN's Antiproton Decelerator, has opened up the possibility to perform a direct measurement of the Earth's gravitational acceleration g on a purely antimatter system. Indeed, from the experimental point of view, very little is known about the gravitational interaction between matter and antimatter. In particular, the Weak Equivalence...
In recent years, interest in charmonium spectroscopy has been renewed by
the unexpected discovery of multiple states that seemingly do not fit a conventional
charmonium (ccbar) assigment, the so-called XYZ states. Although there are strong
indications that these states are in fact exotic, there is no consensus on their
exact nature. Therefore, it is of high importance to gather as much...
