J. H. Jett

A surface-delta description of analyzing power measurements for collective states of Ni and Zn isotopes☆

Abstract Analyzing powers and differential cross sections for the inelastic scattering of 15 MeV polarized protons to the stronger collective states of 58, 60 Ni and 64 Zn have been measured. The data were compared to detailed microscopic reaction calculations using a central plus spin-dependent effective interaction. The nuclear structure wave functions used were obtained from a quasiparticle random-phase appoximation calculation using a spin-dependent surface delta interaction and a basis set containing both neutron and proton configurations. The overall quality of the fits strongly suggests that the surface-delta wave functions provide a good representation for spherical nuclei in this intermediate mass range. The effects of exchange and further modifications to the microscopic effective interaction are discussed.

ACCURATE DEUTERON-DEUTERON ELASTIC SCATTERING CROSS SECTIONS*

Publisher Summary This chapter discusses the accurate deuteron–deuteron elastic scattering cross sections at 12.305 MeV with relative errors of 0.5% and a scale error of about 0.4%. The energy is chosen to complement t+p scattering and reactions at 13.6 MeV. The deuteron beam from the Los Alamos tandem Van de Graaff accelerator is passed through a gas target with thin Havar foil windows, and the scattered deuterons are detected by a single E-ΔE detector arrangement using solid-state detectors. Amplified pulses gated by the E-ΔE coincidence are digitized and sent to an online computer for mass analysis and storage. There is lesser absolute error in this experiment. The deuterium gas used is approximately 98% pure and the major contaminant is hydrogen. During bombardment, the ionized deuterium interacts with organic compounds slowly increasing the fraction of the hydrogen. The absolute error is the quadratic sum of the relative and scale errors.