  Momentum correlation functions of the nucleon-nucleon pairs are presented for
reactions with C isotopes bombarding a $^{12} \rm C$ target within the
framework of the isospin-dependent quantum molecular dynamics model. The
binding-energy dependence of the momentum correlation functions is also
explored, and other factors that have an influence on momentum correlation
functions are investigated. These factors include momentum-dependent nuclear
equation of state, in-medium nucleon-nucleon cross sections, impact parameters,
total pair momenta, and beam energy. In particular, the rise and the fall of
the strength of momentum correlation functions at lower relative momentum are
shown with an increase in beam energy.
