München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 5: Theorie

HK 5.3: Vortrag

Montag, 20. März 2006, 14:30–14:45, B

Chiral dynamics of nuclear matter — •Monika Mühlbauer, Norbert Kaiser, and Wolfram Weise — Physik-Department, Technische Universität München, D-85747 Garching, Germany

In the framework of chiral perturbation theory, we investigate binding and saturation of nuclear matter through explicit two-pion exchange dynamics. Excitations of virtual Δ(1232)-isobars and associated three-body forces are systematically taken into account. The high momentum components of the pion-loop integrals are regularized by a π NN-vertex function of monopole type. In adjusting the monopole mass (the single parameter) to Λ=1.18 GeV, the empirical saturation point of nuclear matter can be well reproduced: ρ₀=0.158fm⁻³, Ē₀=−16.8 MeV. Variations of Λ can be compensated by two contact interactions contributing as k_f³ and k_f⁵ to the energy per particle. In the same framework, we study the equation of state of pure neutron matter, the density-dependent asymmetry energy and the single-particle potential (nuclear mean field).
Supported in part by BMBF and GSI.