The Gogny-HFB+QRPA dipole strength function and its application to radiative neutron capture cross section

¹ Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP-226, 1050 Brussels, Belgium
² CEA, DAM, DIF, F-91297 Arpajon, France

^* e-mail: sgoriely@astro.ulb.ac.be

Published online: 16 May 2018

Abstract

Valuable theoretical predictions of nuclear dipole excitations in the whole chart are of great interest for different nuclear applications, including in particular nuclear astrophysics. Here we extend our large-scale calculations of the E1 and M1 absorption γ-ray strength function obtained in the framework of the axially-symmetric deformed quasiparticle random phase approximation (QRPA) based on the finite-range D1M Gogny force to the determination of the de-excitation strength function. To do so, shell-model calculations of the de-excitation dipole strength function as well as experimental data are considered to provide insight in the low-energy limit and to complement the QRPA estimate phenomenologically. We compare our final prediction of the E1 and M1 strengths with available experimental data at low energies and show that a relatively good agreement can be obtained. Its impact on the average radiative width as well as radiative neutron capture cross section is discussed.