Journal
PHYSICAL REVIEW C
Volume 61, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.61.024613
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In a detailed investigation of giant dipole resonance (GDR) gamma-ray yield from the O-16+Pb-208 system, the absolute gamma-ray/fission multiplicities are extracted and reported over a wide range of excitation energy and angular momentum. The enhanced yield of GDR decay gamma rays from the compound system has been analyzed within the framework of a modified statistical model containing the nuclear viscosity as a foe parameter. The nuclear viscosity parameter gamma has been studied over a much wider range of excitation energy and angular momentum than in earlier works. The measured gamma-ray multiplicities as well as known neutron multiplicities and evaporation residue cross sections indicate a strongly damped fission motion. The systematics of the extracted dissipation coefficient is fitted equally well with either temperature or a deformation-dependent nuclear viscosity.
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