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Gamma rays emitted from hot nuclei with mass around 115 and excitation energies between 350 and 500 MeV, formed in the ³⁶Ar + ⁹⁰Zr reaction at 27 MeV/nucleon have been measured. The {γ}-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 {γ} 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 {γ} emission from the resonance above an excitation energy of 250 MeV. The existing data do not show entrance channel effects.
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Faou et al. (1994) studied this question.
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