Study of the Giant Dipole Resonance Built on Highly Excited States in Sn and Dy Nuclei.

摘要

A study is presented of the giant dipole resonance built on highly excited states. The aim is to get more detailed information on the properties of the GDR and to use it as a tool for the investigation of nuclear structure at high excitation energy. The high energy gamma -rays seen from the decay of excited state GDRs in heavy ion fusion reactions reflect the average properties of the states populated by the gamma -emission. The measurements at different initial excitation energies of /sup 114/Sn provide information on the nuclear level density near the particle separation energy at an average angular momentum of 10 Planck constant. The study of shape changes at very high spin in /sup 152-156/Dy nuclei is presented. A theoretical model developed to describe fusion-evaporation reactions is presented. 149 refs.; 63 figs.; 13 tabs. (Atomindex citation 20:025215)