2-NUCLEON CORRELATIONS AND THE NUCLEON SPECTRAL-FUNCTION IN NUCLEAR-MATTER AT FINITE-TEMPERATURE - LOW-DENSITY REGION

The nucleon spectral function is calculated in low-density nuclear mat ter at finite temperature. Using Matsubara Green's functions the nucle on selfenergy is evaluated in the ladder approximation for the thermod ynamic two-particle T-matrix. In addition to the contribution from the continuum part of the T-matrix special attention is paid to its pole contribution reflecting the two-particle bound state (deuteron) in the medium. The consequences of the formation of two-particle bound state s for the selfenergy and the one-particle spectral function are shown.