Fine Structure of Pygmy and Giant Multipole Resonances in Nuclei

Abstract

In connection with the planned work program at the megascience facility ‘‘Intense Inverse Compton’’ (INOC) at the Scientific Center for Physics and Mathematics in Sarov, a brief overview of experimental and theoretical results in the energy range of pygmy and giant resonances is presented. Considered are: (1) the pygmy dipole resonance in \({}^{208}\)Pb, for which the experimental resolution limit has already been reached, and separate \(1^{-}\) levels have been identified; (2) the most important physical results of experiments with resolution 50–200 keV both for the gamma strength functions, which determine characteristics of nuclear reactions, and for the analysis of nonstatistical mechanisms of formation of the widths of giant resonances (‘‘doorway’’ states) within the framework of wavelet analysis. Some results in the energy excitation range 1–5 MeV are also discussed.