Abstract
We present a measurement of subthreshold antiproton, kaon, and energetic pion production at 0\ifmmode^\circ\else\textdegree\fi{} for the reactions $^{28}$Si${+}^{28}$Si at 2.0 GeV/nucleon (${E}_{\mathrm{available}/\mathrm{A}=0.82}$ GeV) and 1.65 GeV/nucleon (${E}_{\mathrm{available}/\mathrm{A}=0.70}$ GeV), and for $^{20}$Ne+NaF at 2.0 GeV/nucleon. For a given reaction, the particle yields, plotted as a function of the required excitation energy, exhibit a scaling behavior independent of particle species. Implications for collectivity and a common production mechanism are discussed.
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