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The systematic evolution of the giant dipole resonance (GDR) width in thetemperature region of 0.9 ~ 1.4 MeV has been measured experimentally for 119Sbusing alpha induced fusion reaction and employing the LAMBDA high energy photonspectrometer. The temperatures have been precisely determined by simultaneouslyextracting the vital level density parameter from the neutron evaporationspectrum and the angular momentum from gamma multiplicity filter using arealistic approach. The systematic trend of the data seems to disagree with thethermal shape fluctuation model (TSFM). The model predicts the gradual increaseof GDR width from its ground state value for T > 0 MeV whereas the measured GDRwidths appear to remain constant at the ground state value till T ~ 1 MeV andincrease thereafter indicating towards a failure of the adiabatic assumption ofthe model at low temperature.

Measurement of Giant Dipole Resonance width at low temperature: A new experimental perspective