  The high momentum tail (HMT) of nucleons, as a signature of the short-range
correlations in nuclei, has been investigated by the high-energy bremsstrahlung
$\gamma$ rays produced in $^{86}$Kr + $^{124}$Sn at 25 MeV/u. The energetic
photons are measured by a CsI(Tl) hodoscope mounted on the spectrometer CSHINE.
The energy spectrum above 30 MeV can be reproduced by the IBUU model
calculations incorporating the photon production channel from $np$ process in
which the HMTs of nucleons is considered. A non-zero HMT ratio of about $15\%$
is favored by the data. The effect of the capture channel $np \to d\gamma$ is
demonstrated.
