Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-12-02
Physics
Nuclear Physics
Nuclear Experiment
Submitted to Physics Letters B (6 pages, 3 figures, 1 table)
Scientific paper
The systematic evolution of the giant dipole resonance (GDR) width in the temperature region of 0.9 ~ 1.4 MeV has been measured experimentally for 119Sb using alpha induced fusion reaction and employing the LAMBDA high energy photon spectrometer. The temperatures have been precisely determined by simultaneously extracting the vital level density parameter from the neutron evaporation spectrum and the angular momentum from gamma multiplicity filter using a realistic approach. The systematic trend of the data seems to disagree with the thermal shape fluctuation model (TSFM). The model predicts the gradual increase of GDR width from its ground state value for T > 0 MeV whereas the measured GDR widths appear to remain constant at the ground state value till T ~ 1 MeV and increase thereafter indicating towards a failure of the adiabatic assumption of the model at low temperature.
Banerjee Kinjal
Banerjee S. R.
Bhattacharya Chandana
Bhattacharya Sailajananda
Bhattacharya Srijit
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