Models for photoabsorption cross section estimatesV. Plujko1, I. Kadenko1, S. Goriely2, E. Kulich1, O. Davidovskaya3 and O. Gorbachenko1
1 Nuclear Physics Department, Taras Shevchenko National University, 03022 Kyiv, Ukraine
2 Institut d'Astrophysique Université Libre de Bruxelles, Brussels, Belgium
3 Nuclear Structure Department, Institute for Nuclear Research, NAS of Ukraine, Kyiv, Ukraine
Published online: 21 May 2008
Extensive comparisons of dipole radiative strength calculations within the framework of different methods are performed in middle and heavy atomic nuclei both near and out of the beta-stability line. Photoabsorption cross sections are calculated and compared with experimental data to test radiative strength function (RSF) models. It was found that phenomenological closed-form models of modified Lorentzian can be recommended for overall estimates of the dipole RSF in the energy region up to about 20 MeV, at least for nuclei for which experimental giant dipole resonance (GDR) parameters exist or the corresponding systematics can be adopted. Otherwise, the HFB-QRPA microscopic method and semi-classical approach with moving surface appear to be more adequate for the determination of the dipole RSF.
© CEA 2008