In this work some experimental results on particle production in nucleus-nu
cleus at high energies are discussed in connection with some unusual states
in nuclear matter formed in such collisions. Cross-sections, multiplicitie
s, participants, space-time characteristics of the particle sources, cumula
tive particle production, temperature and densities are taken into account.
Some evidences for unusual states in nuclear matter at energies lower than
10A GeV are obtained.