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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Struktur und Dynamik von Kernen

HK 20.3: Talk

Monday, March 4, 2013, 17:30–17:45, HSZ-401

Nuclear Thermodynamics with Chiral Low-Momentum Interactions — •Corbinian Wellenhofer¹, Jeremy Holt^1,2, Norbert Kaiser¹, and Wolfram Weise^1,3 — ¹Physik Department, Technische Universität München, D-85747 Garching, Germany — ²Physics Department, University of Washington, Seattle, Washington 98195, USA — ³ECT*, Villa Tambosi, I-38123 Villazzano (TN), Italy

We discuss the thermodynamical properties of nuclear matter on the basis of chiral low-momentum interactions. The universal low-momentum nucleon-nucleon potential V_low-k(Λ) is combined with three-nucleon forces from chiral effective field theory. With these two- and three-body interactions, we have calculated the free energy per particle for both isospin-symmetric nuclear matter and neutron matter by considering contributions up to second order in many-body perturbation theory. In order to examine the model-dependence of the results we have varied the resolution scale Λ, and performed also calculations with a regularized chiral NN potential instead of V_low-k(Λ). The critical temperature for the liquid-gas phase transition has been determined to be T_c≃ 16 MeV. In the coexistence region of the nuclear liquid and gas phase the physical free energy has been determined by the usual Maxwell construction.