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Validity of the quasiparticle approximation in nuclear matter.

The validity of the standard quasiparticle approximation is tested by treating the complex self-energy in nuclear matter self-consistently. Hole-hole propagation is ignored. The real part of the mass operator is modified only slightly for both hole and particle states. Therefore the binding energy/saturation density problem remains unaltered. The imaginary part of the mass operator changes noticeably for particles propagating substantially above the Fermi surface. This effect may be relevant in determining the absorptive part of the optical potential for intermediate energy scattering.