SAID SHEHATA

The electrical resistivity of the ferrites Mg1+tFe2-2 tTitO4 (t=0.1, 0.3, 0.4, 0.5) has been measured in the temperature range of 30 to 300° C. A break in In ρ{variant} against 1/T around TC has been observed. This break is associated with a change in the activation energy around the Curie temperature. The conductivity behaviour is discussed in terms of the cation distribution in these ferrites. © 1983 Chapman and Hall Ltd.

Nuclear reactions between two heavy interacting ions with nucleon transfer have been reconsidered. The direct nuclear reaction mechanism is considered. Different reaction processes are considered for single neutron or proton stripping and pickup reactions. The interacting nuclear potential of the transferred nucleon is taken to have the form of the Skyrme-type potential. With this representation for the nuclear potential of the transferred nucleon, an expression for the differential cross section is obtained by using the distorted-wave Born approximation. This expression is applied and considered for the heavy ion reactions with incident heavy ion projectiles B10, C13, O16, O18, and S32 bombarding the heavy targets Al27, Si28, Si29, Si30, and S32. The energies of the incident heavy ions have values in the range between 36.0 and 100.0 MeV. Numerical calculations of the differential cross sections are carried out. The theoretically calculated angular distributions are in good agreements with the experimental measurements. Reasonable spectroscopic factors are extracted from the present calculations. NUCLEAR REACTIONS Nucleon stripping and nucleon pickup induced by 36.0-100.0 MeV B10, C13, O16, O18, and S32 on Al27, Si28, Si29, Si30, and S32; calculated σ(θ). Finite range DWBA calculations, extracted spectroscopic factors. © 1983 The American Physical Society.