We analyze the formation and decay properties of nucleon resonances formed in heavy-ion collisions at 1--2 GeV/u within a microscopic transport approach. In case of Au+Au reactions the density of {Δ} resonances reaches 0.15 fm^-3 in the central cell for a time period of the order of 10 fm/c such that one can legitimately speak about resonance matter. The lifetime of the {Δ}'s is found to be shortened at high density by only 20% due to the in-medium channel {Δ}+N{→}N+N.
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Ehehalt et al. (1993) studied this question.
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