Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Struktur und Dynamik von Kernen
HK 3.5: Vortrag
Montag, 17. März 2014, 15:15–15:30, HZ 4
Nuclear Thermodynamics with Chiral Low-Momentum Interactions — •Corbinian Wellenhofer1, Jeremy Holt2, and Norbert Kaiser1 — 11Physik Department, Technische Universität München, D-85747 Garching, Germany — 22Physics Department, University of Washington, Seattle, Washington 98195, USA
In chiral effective field theory, the low-energy constants (LECs) which parametrize nuclear two- and many-body forces are usually determined in fits to few-body observables. This fitting procedure is however not unique, and there exist various different sets of LECs in the literature, all leading to consistent results in few-body calculations. However, this does not mean that the same has to be true regarding nuclear matter properties.
We present results for the thermodynamical nuclear equation of state (EoS), calculated by considering all contributions up to second order in many-body perturbation theory. The results for the pressure P(ρ,T) obtained by using different chiral low-momentum interactions are reasonably similar in the case of zero temperature, however, they differ with respect to their temperature behaviour, leading to deviating thermodynamical properties. The model-dependence of the different NN and 3N contributions to the nuclear EoS is then investigated in detail, and we find that the differences are predominently due to the different values of the LECs that parametrize the 3N force. The value of the critical temperature of the nuclear liquid-gas phase transition is determined for all sets of potentials.