Author/Authors :
E. Ramakrishnan، نويسنده , , A. A. Azhari، نويسنده , , J.R. Beene، نويسنده , , R.J. Charity، نويسنده , , M.L. Halbert، نويسنده , , P.-F. Hua، نويسنده , , R.A. Kryger، نويسنده , , P.E. Mueller، نويسنده , , R. Pfaff، نويسنده , , D.G. Sarantites، نويسنده , , L.G. Sobotka، نويسنده , , M. Thoennessen، نويسنده , , G. Van Buren، نويسنده , , R.L. Varner Jr.، نويسنده , , and S. Yokoyama، نويسنده ,
Abstract :
The evolution of the giant dipole resonance (GDR) in hot 208Pb nuclei was studied by measuring high energy γ-rays from the decay of the resonance built on excited states. Nuclei in the excitation energy range of 40–110 MeV were populated by inelastic scattering of 40 MeV/nucleon α-particles. The GDR width was observed to increase systematically from 4 MeV at the ground state to ∼8 MeV at the highest excitation energy.
Keywords :
Hot nuclei , Giant dipole resonance , Statistical model , Shell effects
