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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 46: Theory VII

HK 46.7: Talk

Thursday, March 11, 2004, 18:30–18:45, D

Nucleon Spectral Functions in Asymmetric Nuclear Matter — •Patrick Konrad, Horst Lenske, and Ulrich Mosel — Institut für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany

We use a model based on a transport theoretical approach [1] for calculating the nucleon spectral function in asymmetric nuclear matter. The spectral functions for neutrons and protons are derived self-consistently by assuming a constant matrix element for ppp−1, nnn−1, pnn−1 and npp−1 collisions. The mean-field contribution is incorporated by a Skyrme type potential, including momentum dependence. Using the Kramers-Kronig relation the real part of the self-energy was inserted. At the end we compare our results for different densities and proton-neutron asymmetries. From calculations with and without the real part of the dynamical self-energy we find that the spectral properties are only weakly affected by dispersive effects. For increasing neutron excess the neutron spectral function shows a stronger momentum dependence than the proton spectral function which is explained by the isospin dependence of the effective mass. An outlook to future calculations with a fully self-consistent treatment of the dynamical and the mean-field parts and extensions to hypermatter is given.
Work supported by BMBF.

[1] J.Lehr, H.Lenske, S.Leupold, U.Mosel, Nucl.Phys.A703 (2002) 393

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