SCATTERING OF ALPHA-PARTICLES FROM TI-46 AT E(ALPHA)=45 AND 50 MEV AND FROM TI-48 AT E(ALPHA)=40 AND 45 MEV

Differential cross-sections for elastic and inelastic scattering of 45 and 50 MeV alpha-particles from Ti-46 have been measured in the angular range from theta(lab) = 5-degrees to 135-degrees in 2.5-degrees and 5-degrees steps and those of 40 and 45 MeV alpha-particles from Ti-48 in the angular ranges from theta(lab) = 20-degrees to 125-degrees and 5-degrees to 130-degrees, respectively, in the same angular steps. A six-parameter optical-model analysis of the elastic-scattering data has been carried out using Woods-Saxon, and Woods-Saxon-squared radial dependences. A method based on predicting optical-model potential parameters starting with a consistent set of parameters at higher energies following the energy dependences established from the systematics has also been used. The most sensitive region of the potential in predicting the elastic-scattering cross-sections has been found by using a notch perturbation test. The problem of discrete family ambiguity in the optical-model analysis of elastic data has also been investigated. The inelastic-scattering data have been analysed in terms of the collective model using the distorted-wave Born approximation (DWBA), where the distorted waves are generated by the optical potential obtained from the elastic-scattering data. The values of the deformation parameter (beta2) thus obtained compare very well with the ones reported earlier.