The gamma decay of the giant dipole resonance (including its low-energy tail region) is an important tool to probe the properties of these states, and thus to test in detail the existing predictions. This paper focuses on two main aspects concerning the electric dipole excitation in nuclei. One is the study of the isospin character of the low-energy tail of the Giant Dipole Resonance (GDR), the so-called pygmy resonance, and the other is the isospin mixing of nuclear systems at finite temperature. In the first case, the pygmy resonance was populated using the inelastic-scattering reaction induced by 17O beams at 20 MeV/u. Comparison is made with data obtained with (α, α′γ) and (γ, γ′) reactions. In the second case, the gamma decay of the GDR in thermalized nuclear systems, formed in fusion-evaporation reactions, was used to investigate the isospin mixing in 80Zr. For this work the reactions 40Ca + 40Ca at 3.4 MeV/u and 37Cl + 44Ca at 2.6 MeV/u were employed.
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