Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Struktur und Dynamik von Kernen

HK 10.3: Talk

Monday, March 17, 2014, 17:30–17:45, HZ 4

Cluster correlations on the surface of nuclei and the neutron skin thickness — •Stefan Typel — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt

Correlations are an essential feature in nuclear many-body systems. The attractive nucleon-nucleon interaction, in particular, causes the formation of clusters in matter below nuclear saturation density. Adapting a generalized relativistic density functional approach with explicit cluster degrees of freedom, which is used in the description of the nuclear matter equation of state [1,2], the appearance of α particles on the surface of nuclei can be studied. It affects the neutron and proton radii and thus the neutron skin thickness of nuclei. A tight correlation between this quantity and the density dependence of the nuclear symmetry, which is important for the prediction of the equation of state of neutron rich matter in compact stars, has been observed in conventional mean-field models. The formation of α particles in the nuclear skin systematically modifies this correlation and has to be considered when conclusions on the slope of the symmetry energy are drawn from the measurement of the neutron skin thickness of neutron-rich heavy nuclei.

[1] S. Typel, G. Röpke, T. Klähn, D. Blaschke, H.H. Wolter, Phys. Rev. C 81 (2010) 015803

[2] S. Typel, H.H. Wolter, G. Röpke, D. Blaschke, accepted for publication in Eur. Phys. J. A