Nucleon Nucleus Optical Model Parameters A 40 E 50 Mev

The nucleon optical model is widely used to calculate the elastic scattering cross-sections and polarisations for the interaction of neutrons and protons with atomic nuclei. The optical model potentials not only describe the scattering but also provide the wave functions needed to analyse a wide range of nuclear reactions. They also unify many aspects of nuclear reactions and nuclear structure. This book consists of a comprehensive introduction to the subject and a selection of papers by the author describing the optical model in detail. It contains full references to the original literature with many examples of the application of the model to the analysis of experimental data.

The authors report on the development of new global optical model potentials for nucleon-nucleus scattering at medium energies. Using both Schroedinger and Dirac scattering formalisms, the goal is to construct a physically realistic optical potential describing nucleon-nucleus elastic scattering observables for a projectile energy range of (perhaps) 20 meV to (perhaps) 2 GeV and a target mass range of 16 to 209, excluding regions of strong nuclear deformation. They use a phenomenological approach guided by conclusions from recent microscopic studies. The experimental database consists largely of proton-nucleus elastic differential cross sections, analyzing powers, spin-rotation functions, and total reaction cross sections, and neutron-nucleus total cross sections. They will use this database in a nonlinear least-squares adjustment of optical model parameters in both relativistic equivalent Schroedinger (including relativistic kinematics) and Dirac (second-order reduction) formalisms. Isospin will be introduced through the standard Lane model and a relativistic generalization of that model.

A global, energy-dependent, Lane-model, nucleon-nucleus optical potential has been determined by fitting (p, n)-IAS angular distributions between 25 and 45 MeV while maintaining the fit obtained by Becchetti and Greenlees to proton elastic-scattering data over a wide mass and energy range, thus firmly establishing the essential validity of the Lane model for nucleon-nucleus optical potentials.

Nuclear Spectroscopy and Reactions, Part B covers information regarding the development of nuclear spectroscopy and its reactions, while emphasizing in-beam spectroscopy. This part specifically covers charged particle spectroscopy, spectroscopy from meson-induced reactions, and neutron spectroscopy. Organized into three sections, this book first discusses charged particle spectroscopy, which includes resonance reaction, reactions involving light ions, heavy-ion-induced reaction, and specialized reaction. The next section reviews spectroscopy from meson-induced reactions, including muonic and hadronic atoms; radiative capture; and charge exchange, scattering, and direct reactions. The final section discusses neutron spectroscopy, which includes advances in measurement of neutron spectra, charge exchange reactions, and polarization phenomena. This book is written to primarily benefit graduate students who are engaged in research that concerns nuclear spectroscopy.