Signs of Phase Transitions in Two-Nucleon Systems
The properties of dense nuclear matter under extreme conditions are a subject of the large experimental activities worldwide. Heavy-ion collision experiments are the agenda item at RHIC, LHC, FAIR, and NICA facilities. Meanwhile, a complementary approach to the heavy-ion collision researches devoted to investigation of phase transitions in few-nucleon systems has not been discussed. In this paper, we try to fill up the gap. It is shown that signals of the phase transition of deuteron into 6-q bag as well as signs of formation of the pion Bose-Einstein condensate in compressed two-nucleon systems might be already observed in deuteron-deuteron collisions.