Microscopic description ofα+Nbremsstrahlung by a Siegert approach

Abstract

A microscopic cluster model of the nucleus-nucleus bremsstrahlung based on an extension of the Siegert theorem, i.e., based on the charge density rather than on the current, allows including implicitly a part of the effects of meson-exchange currents. This approach was developed in a previous paper for zero-spin nuclei and applied to the α+α bremsstrahlung. This model is extended to colliding nuclei with nonzero spins and applied to the α+p and α+n bremsstrahlungs. A comparison between the bremsstrahlung cross sections for these mirror systems is made. The importance of the meson-exchange currents on the α+N bremsstrahlungs is discussed by comparing the E1 and E2 components of the bremsstrahlung cross sections obtained in the Siegert approach where these currents are partly included and in the non-Siegert approach where they are fully neglected. © 2014 American Physical Society.