https://doi.org/10.1140/epja/i2019-12899-6
Regular Article - Theoretical Physics
Description of nuclear photoexcitation by Lorentzian expressions for electric dipole photon strength function
1
Taras Shevchenko National University of Kyiv, Volodymyrska str.60, 01601, Kyiv, Ukraine
2
Institute for Nuclear Research, Prosp. Nauki 47, 03028, Kyiv, Ukraine
* e-mail: oleksandr.gorbachenko@gmail.com
Received:
19
April
2019
Accepted:
27
September
2019
Published online:
18
November
2019
The description of photoabsorption cross-sections of cold nuclei by closed-form Lorentzian models of photon strength functions for photoexcitation by electric dipole gamma-rays is considered. Systematics of the GDR parameters are given and input parameters of different analytical models are discussed The experimental data are compared with theoretical calculations for even-even nuclei using criteria of minimum of both least-square value and root-mean-square deviation factor. Simple extensions of the models with energy-dependent widths to high gamma-ray energies 
MeV which hold the energy-weighted sum rule for E1 gamma-transitions in good approximation are proposed and tested.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019
