  The energy spectrum of the high energy gamma-rays in coincidence with the
prompt gamma rays has been measured for the spontaneous fission of 252Cf. The
nucleus-nucleus coherent bremsstrahlung of the accelerating fission fragments
is observed and the result has been substantiated with a theoretical
calculation based on the coulomb acceleration model. The width of the giant
dipole resonance (GDR) decay from the excited fission fragments has been
extracted for the first time and compared with the thermal shape fluctuation
model (TSFM) in the liquid drop formalism. The extracted GDR width is
significantly smaller than the predictions of TSFM.
