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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