Simultaneous microscopic description of nuclear level density and radiative strength function

Abstract

Nuclear level density (NLD) and radiative strength function (RSF) are described simultaneously within a microscopic approach, which takes into account the thermal effects of the exact pairing as well as the giant resonances within the phonon-damping model. The good agreement between the results of calculations and experimental data extracted by the Oslo group for ${}^{170,171,172}$Yb isotopes shows the importance of exact thermal pairing in the description of NLD at low and intermediate excitation energies and invalidates the assumption based on the Brink-Axel hypothesis in the description of the RSF.

Comments: 5 pages, 2 figures, some typos are corrected, accepted for publication in Phys. Rev. Lett