Description of radiative strength functions in deformed nuclei

Abstract

Radiative strength functions ofE1- andM1-transitions from ground states of doubly even deformed nuclei to states near the neutron binding energyBn are calculated within the quasiparticle-phonon nuclear model. The wave functions of excited states include one- and two-phonon components. The calculations were made with the Pauli principle being or not included in the two-phonon components of the wave functions. It is shown that the radiativeE1- andM1-strength functions as well as the widths of giant dipole resonances in deformed nuclei are slightly influenced by the two-phonon components of the wave functions and they can be calculated in the RPA. ThekE1- andkM1-values are calculated for some deformed nuclei of the rare-earth and actinide region. The calculated values ofkE1 are 1.5–2 times larger and the values ofkM1 are somewhat less than the average values obtained in [14] from the analysis of available experimental data.