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The particle-hole and Delta -hole excitations are well-known elementaryexcitation modes for the pion propagator in nuclear matter. But, the excitationalso involves antiparticles, namely, nucleon-antinucleon, anti-Delta-nucleonand Delta-antinucleon excitations. These are important for high-energy momentumas well, and have not been studied before, to our knowledge. In this paper, wegive both the formulas and the numerical calculations for the real and theimaginary parts of these excitations.Comment: Latex, 3 eps file

physical review. c. nuclear physics/physical review. c, nuclear physics

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