Physical Review Letters · 1994 · 50 citations · 17 references
Natural SciencesPhysicsAstrophysicsNuclear PhysicsRadiation PhysicsGamma EmissionGamma-ray SpectroscopyNuclear DecayRadiative ProcessesRadioactive DecayExcitationGiant ResonancesMultiplicity FormationNuclear Gamma ResonanceNuclear Matter At Finite TemperatureSpontaneous Emission
Gamma rays emitted from hot nuclei with mass around 115 and excitation energies between 350 and 500 MeV, formed in the $^{36}\mathrm{Ar}$ + $^{90}\mathrm{Zr}$ reaction at 27 MeV/nucleon have been measured. The \ensuremath{\gamma}-ray yield from the decay of the giant dipole resonance in these nuclei remains constant over the excitation energy range studied. This quenching of the \ensuremath{\gamma} multiplicity cannot be explained by a continuous increase with temperature of the width of the resonance. Better agreement with the data is obtained by assuming a cutoff of \ensuremath{\gamma} emission from the resonance above an excitation energy of 250 MeV. The existing data do not show entrance channel effects.
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Saturation of the width of the giant dipole resonance at high temperature
A. Bracco, J. J. Gaardhøje, A. M. Bruce et al. · Physical Review Letters · 1989 · 133 citations
E. Migneco, C. Agodi, R. Alba et al. · Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · 1992 · 113 citations