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We discuss the origin of the difference between the harmonic value of thewidth of the multiphonon giant resonances and the smaller observed value.Analytical expressions are derived for both the effective width and the averagecross-section. The contribution of the Brink-Axel mechanism in resolving thediscrepancy is pointed out.Comment: 9 pages, 4 figure

Effective widths and effective number of phonons of multiphonon giant resonances