Atomic and Nuclear Physics

Biography

Biography: Doris Jakubassa-Amundsen

Abstract

A precise knowledge of electron-nucleus bremsstrahlung is important for estimating its influence on the electron spectra from nuclear excitation. In coincidence experiments, planned at the S-DALINAC accelerator set-up in Darmstadt (Germany), the photons from electron bremsstrahlung compete with those from 'nuclear bremsstrahlung' resulting from the subsequent decay of the excited nucleus. The sensitivity of such experiments to nuclear structure effects can be increased by measuring, beyond the intensity, the polarization correlations between the projectile electron and the emitted photon. The relativistic partial-wave approach to electron bremsstrahlung is extended to collision energies up to 30 MeV in order to test the validity of the PWBA for heavy nuclei and to extrapolate the extracted PWBA enhancement factors to somewhat higher energies. Our examples include the bremsstrahlung contribution to the excitation spectra from 46MeV e+¹⁵⁰Nd collisions, recently measured at the S-DALINAC, as well as predictions for the coincident (e; e⁰ ) experiments focusing on the 2+ excitation of ⁹²Zr.