Ghosh, C.Kumar, A.K.R.Dey, B.Nanal, V.Pillay, R.G.Arumugam, P.Anoop, K.V.Dokania, N.Garai, A.Gupta, G.Mirgule, E.T.Mishra, G.Mondal, D.Pal, S.Pose, M.S.Rout, P.C.2020-03-312020-03-312017Physical Review C, 2017, Vol.96, 1, pp.-https://idr.nitk.ac.in/handle/123456789/11410Exclusive measurements of high-energy ? rays have been performed in Ba124 and Ba136 at the same excitation energy (?49MeV) to study the properties of the giant dipole resonance (GDR) over a wide N/Z range. The high-energy ? rays are measured in coincidence with the multiplicity of low-energy ? rays to disentangle the effect of temperature (T) and angular momentum (J). The GDR parameters are extracted employing a simulated Monte Carlo statistical model analysis. The observed ?-ray spectra of Ba124 can be explained with prolate deformation, whereas a single-component Lorentzian function which corresponds to a spherical shape could explain the ?-ray spectra of Ba136. The observed GDR width in Ba136 is narrower compared to that of Ba124. The statistical model best-fit GDR cross sections are found to be in reasonable agreement with the thermal shape fluctuation model (TSFM) calculations. Further, it is shown that the variation of GDR width with T is well reproduced by the TSFM calculations over the temperature range of 1.1-1.7 MeV. 2017 American Physical Society.Article