Evidence for a Soft Nuclear-Matter Equation of State

Philip J. Siemens, Joseph I. Kapusta

Research output: Contribution to journalArticle

209 Scopus citations


The entropy of the fireball formed in central collisions of heavy nuclei at center-of-mass kinetic energies of a few hundred MeV per nucleon is estimated from the ratio of deuterons to protons at large transverse momentum. The observed paucity of deuterons suggests that strong attractive forces are present in hot, dense nuclear matter, or that degrees of freedom beyond the nucleon and pion may already be realized at an excitation energy of 100 MeV per baryon.

Original languageEnglish (US)
Pages (from-to)1486-1489
Number of pages4
JournalPhysical review letters
Issue number20
StatePublished - Jan 1 1979
Externally publishedYes

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