On the Color-Singlet States in Many-Quark Model with the su(4)-Algebraic   Structure. III
  A phase structure and phase transitions are investigated in the modified Bonn quark model. The force strength, which represents the particle-hole type interaction, is devised so as to depend on the quark number, namely quark number density. As a result, it is shown that the phase transition from the quark-triplet state as a nucleon to the quark-pair state as a color-superconducting state occurs as the density increases. 
Y.Tsue (Kochi Univ., Japan), C.Providencia (Univ. de Coimbra,   Portugal), J.da Providencia (Univ. de Coimbra, Portugal), M....
nucl-th