ISOLDE Workshop and Users meeting 2021

Comprehensive Test of the Brink-Axel Hypothesis in the Energy Region of the Pygmy Dipole Resonance

14 Dec 2021, 17:08

3m

Poster Poster Presentations

Speaker

Ms Maria Markova (University of Oslo)

Description

The validity of the Brink-Axel hypothesis, which is especially important for numerous astrophysical calculations, is addressed for ${}^{116,120,124}$Sn below the neutron separation energy by means of three independent experimental methods. The $\gamma$-ray strength functions (GSFs) extracted from primary $\gamma$-decay spectra following charged-particle reactions with the Oslo method and with the Shape method demonstrate excellent agreement with those deduced from forward-angle inelastic proton scattering at relativistic beam energies.
In addition, the GSFs are shown to be independent of excitation energies and spins of the initial and final states.
The results provide the critical test of the generalized Brink-Axel hypothesis in heavy nuclei, demonstrating its applicability in the energy region of the pygmy dipole resonance.

Presentation materials

ISOLDE_2021_Markova_poster.pdf

ISOLDE_2021_Markova_presentation.pdf