Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1993-04-08
Nucl.Phys. A571 (1994) 617-644
Physics
Nuclear Physics
Nuclear Theory
34 pages in standard LaTeX GSI-preprint No. GSI-93-23
Scientific paper
10.1016/0375-9474(94)90713-7
The spectral function of pions interacting with a gas of nucleons and Delta-33-resonances is investigated using the formalism of Thermo Field Dynamics. After a discussion of the zero Delta-width approximation at finite temperature, we take into account a constant width of the resonance. Apart from a full numerical calculation, we give analytical approximations to the pionic spectral function including such a width. They are found to be different from previous approximations, and require an increase of the effective Delta-width in hot compressed nuclear matter. The results are summarized in an effective dispersion relation for interacting pions.
Henning Patricia A.
Umezawa Hitoshi
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