Closed-Form E1 Radiative Strength Functions for Gamma-Decay and Photoabsorption

Photoabsorption cross sections and γ‐decay strength functions are calculated and compared with experimental data to test simple phenomenological models of E1 gamma‐strength description in the middle‐weight and heavy atomic nuclei. Radiative strength functions with energy asymmetric shape are recommended for overall estimation of averaged gamma‐strengths. Systematics for giant dipole resonance (GDR) parameters are given.