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Within an isospin- and momentum-dependent transport model for nuclearreactions at intermediate energies, we investigate the interplay of thenucleon-nucleon short-range correlations (SRC) and nuclear symmetry energy$E_{sym}(\rho)$ on hard photon spectra in collisions of several Ca isotopes on$^{112}$Sn and $^{124}$Sn targets at a beam energy of 45 MeV/nucleon. It isfound that over the whole spectra of hard photons studied, effects of the SRCoverwhelm those due to the $E_{sym}(\rho)$. The energetic photons come mostlyfrom the high-momentum tails (HMT) of single-nucleon momentum distributions inthe target and projectile. Within the neutron-proton dominance model of SRCbased on the consideration that the tensor force acts mostly in the isosingletand spin-triplet nucleon-nucleon interaction channel, there are equal numbersof neutrons and protons, thus a zero isospin-asymmetry in the HMTs. Therefore,experimental measurements of the energetic photons from heavy-ion collisions atFermi energies have the great potential to help us better understand the natureof SRC without any appreciable influence by the uncertain $E_{sym}(\rho)$.These measurements will be complementary to but also have some advantages overthe ongoing and planned experiments using hadronic messengers from reactionsinduced by high-energy electrons or protons. Since the underlying physics ofSRC and $E_{sym}(\rho)$ are closely correlated, a better understanding of theSRC will in turn help constrain the nuclear symmetry energy more precisely in abroad density range.

The interplay of short-range correlations and nuclear symmetry energy in hard photon productions from heavy-ion reactions at Fermi energies