Compression Effects in Relativistic Nucleus-Nucleus Collisions

The negative-pion multiplicity is measured for central collisions of $^{40}\mathrm{Ar}$ with KCl at eight energies from 0.36 to 1.8 GeV/nucleon and for $^{4}\mathrm{He}$ on KCl and $^{40}\mathrm{Ar}$ on Ba${\mathrm{I}}_{2}$ at 977 and 772 MeV/nucleon, respectively. A systematic discrepancy with a cascade-model calculation which fits proton- and pion-nucleus cross sections but omits potential-energy effects is used to derive the energy going into bulk compression of the system. A value of the incompressibility constant of $K=240$ MeV is extracted in a parabolic form of the nuclear-matter equation of state.

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