  Based on the Isospin-dependent transport model Boltzmann-Uehling-Uhlenbeck
(IBUU), effects of the difference of the high momentum tails (HMTs) of nucleon
momentum distribution in colliding nuclei on some isospin-sensitive observables
are studied in the $^{197}\rm {Au}+^{197}\rm {Au}$ reactions at incident beam
energy of 400 MeV/nucleon. It is found that the nucleon transverse and elliptic
flows, the free neutron to proton ratio at low momenta are all less sensitive
to the specific form of the HMT, while the free neutron to proton ratio at high
momenta and the yields of $\pi^{-}$ and $\pi^{+}$ as well as the
$\pi^{-}/\pi^{+}$ ratio around the Coulomb peak are sensitive to the specific
form of the HMT. Combining the present studies with the experimental
measurements at rare-isotope reaction facilities worldwide, one may get more
insights into the nuclear short-range correlations in heavy nuclei or nuclear
matter.
