Giant dipole resonance in excited 120Sn and 208Pb nuclei populated by inelastic alpha scattering

E. Ramakrishnan, T. Baumann, A. Azhari, R. A. Kryger, R. Pfaff, M. Thoennessen, S. Yokoyama, J. R. Beene, M. L. Halbert, P. E. Mueller, D. W. Stracener, R. L. Varner, G. Van Buren, R. J. Charity, J. F. Dempsey, P. F. Hua, D. G. Sarantites, L. G. Sobotka

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Abstract

The evolution of the giant dipole resonance (GDR) in hot 120Sn and 208Pb nuclei was studied by measuring high energy γ-rays from the decay of the resonance. The excited nuclei were populated by inelastic scattering of α-particles at 40 and 50 MeV/nucleon. The resonance width was observed to increase systematically with excitation energy in both systems. Inelastic scattering populates low angular momentum states in the target. The observed width increase is thus attributed to fluctuations in the nuclear shape induced by temperature.

Original languageEnglish
Pages (from-to)49-55
Number of pages7
JournalNuclear Physics A
Volume599
Issue number1-2
DOIs
StatePublished - Mar 18 1996

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