Behavior of the giant-dipole resonance in $^{120}$Sn and $^{208}$Pb at high excitation energ

Details Behavior of the giant-dipole resonance in $^{120}$Sn and $^{208}$Pb at high excitation energ Behavior of the giant-dipole resonance in $^{120}$Sn and $^{208}$Pb at high excitation energ

1996-07-29

arxiv.org/abs/nucl-th/9607057v1

Nucl.Phys. A614 (1997) 217-237

Physics

Nuclear Physics

Nuclear Theory

28 pages in RevTeX plus eight postscript figures. Submitted to Nucl. Phys. A

Scientific paper

10.1016/S0375-9474(96)00464-2

The properties of the giant-dipole resonance (GDR) are calculated as a function of excitation energy, angular momentum, and the compound nucleus particle decay width in the nuclei $^{120}$Sn and $^{208}$Pb, and are compared with recent experimental data. Differences observed in the behavior of the full-width-at-half-maximum of the GDR for $^{120}$Sn and $^{208}$Pb are attributed to the fact that shell corrections in $^{208}$Pb are stronger than in $^{120}$Sn, and favor the spherical shape at low temperatures. The effects shell corrections have on both the free energy and the moments of inertia are discussed in detail. At high temperature, the FWHM in $^{120}$Sn exhibits effects due to the evaporation width of the compound nucleus, while these effects are predicted for $^{208}$Pb.

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