An experimental study of direct and compound nuclear processes in neutron and deuteron induced reactions

ix, 143 pAlthough our knowledge of the interaction between nucleons is still far from complete, it has been clear for some time that internucleon forces have an extremely complex nature. However, even the consequences of a known simple interaction are difficult to predict for a many-body system such as the nucleus. A great deal of effort has therefore been spent on developing simple models each of which emphasises a particular aspect of nuclear structure. Two of these, the compound nucleus and direct interaction models, place emphasis on nuclear reactions; and since many of the experimental results reported in the following chapters can only be interpreted on the basis of one or the other of these two models, a brief outline of their properties is presented in this chapter

(e,2e) measurements on xeon: reexamination of the fine-structure effect

The process of electron scattering from heavy target atoms is of considerable interest due to the enhanced role of relativistic effects and distortion of the electron trajectories resulting from the large value of nuclear charge. Here we present (e,2e) ionization measurements and distorted-wave Born approximation calculations for the scattering of spin-polarized electrons from xenon atoms in which the fine-structure levels of the residual ion are resolved. Comparison of measurements performed using a high-sensitivity toroidal analyzer spectrometer with the predictions of sophisticated calculations provide an improved understanding of the ionization dynamics of heavy target atoms and the treatment of electron exchange processes

(e,2e) Measurements on Xenon: Reexamination of the Fine-Structure Effect

The process of electron scattering from heavy target atoms is of considerable interest due to the enhanced role of relativistic effects and distortion of the electron trajectories resulting from the large value of nuclear charge. Here we present (e,2e) ionization measurements and distorted-wave Born approximation calculations for the scattering of spin-polarized electrons from xenon atoms in which the fine-structure levels of the residual ion are resolved. Comparison of measurements performed using a high-sensitivity toroidal analyzer spectrometer with the predictions of sophisticated calculations provide an improved understanding of the ionization dynamics of heavy target atoms and the treatment of electron exchange processes

Fully differential cross sections for electron-impact excitation-ionization of aligned D2

We examine fully differential cross sections for 176 eV electron-impact dissociative excitation-ionization of orientated D2 for transitions to final ion states 2sσg, 2pσu, and 2pπu. In previous work [Phys. Rev. A 88, 062705 (2013)PLRAAN1050-294710.110

Experimental and theoretical cross sections for molecular-frame electron-impact excitation-ionization of D 2

We present both experimental and theoretical results for the dissociative ionization of D2 molecules induced by electron impact. Cross sections are determined in the molecular frame and are fully differential in the energies and emission angles of the di

Experimental and Theoretical Cross Sections for Molecular-frame Electron-impact Excitation-ionization of D₂

We present both experimental and theoretical results for the dissociative ionization of D2 molecules induced by electron impact. Cross sections are determined in the molecular frame and are fully differential in the energies and emission angles of the dissociation fragments. Transitions are considered from the X1Σg+ electronic ground state of D2 to the 2sσg, 2pπu and 2pσu excited states of D2+. The experimental results are compared to calculations performed within the molecular four-body distorted-wave framework to describe the multicenter nature of the scattering process. The cross sections reveal a dramatic dependence on both the alignment of the internuclear axis with respect to the direction of the projectile momentum and on the symmetry of the excited dissociating state which is energetically resolved

Particle-in-a-box Momentum Densities Compared with Electron Momentum Spectroscopy Measurements

We investigate the momentum space representation of the solutions of a particle in a three-dimensional box. By comparing the calculated momentum densities of a particle in a box with the measured distribution of highly symmetric molecules we want to elucidate the nature of the measured orbitals. Finally the measured momentum distribution of a free electron metal is compared with the results of this model