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For the strange particles to break down by the strong interaction, the strangeness number would have to remain unchanged, and since all the particles they might break down into had 0 strangeness, they couldn't break down in that way.
For rather complicated theoretical reasons, physicists expect that a quark-gluon plasma will emit a large number of the class of particles called strange particles.
Thus, while physicists in the United States and Europe approach the frontier of nuclear physics by colliding nuclei with other nuclei, the Japanese intend to see what happens when nuclei contain particles of the class called strange particles instead of some of their usual neutrons and protons.