Department of Physics

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Department of Physics

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Browsing Department of Physics by Author "Amusa, A."

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    Absolute Normalization of the Three-Nucleon Transfer Reactions Cross Section in the Distorted-Wave Born Approximation Formalism.
    (Obafemi Awolowo University, 1987) Nubi, Olatunbosun Owolabi; Amusa, A.
    The three-nucleon transfer reaction cross section form factor for direct pick-up reactions (p,α) and (n,α), using DWBA formalism and shell model basis states, is obtained following an approach analogous to that by Towner and Hardy. Explicit calculations, with gaussian form for the interaction, are performed on the portion of the form factor which depends on the a-particle wave function and on the interaction potential The main emphasis is directed towards carrying out exact calculations that avoids drastic approximations in the two-body interaction potential, and such approximation as the point-alpha approximation and other simplifications of the a-particle wave function as it has been successfully carried out by Amusa for two-nucleon pick-up reactions induced by light ions. Two-body interaction parameters which reproduce low-energy scattering data very well are employed in computing values of the normalization and spectroscopic factors that are extracted from the form factor.
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    Generation of the Basis States for the Calculation of the Effects of Core Excitations on the Low-lying Negative Parity States of 90 Zr.
    (Obafemi Awolowo University, 1985) Jegede, Oluwagbemiga Olawale; Amusa, A.
    From the various theoretical studies reported on the low-lying levels in 90 Zr, it has been established that the spectrum is rather anomalous in that it has attributes of a simple two-proton coupling and some collectivity, notably with the 21+, 22+ and 31- low-lying states. The basis states necessary for the inclusion of core excitations in the low-lying negative parity states (J<7-) in 90 Zr are generated in this work. It is hoped that the eventual inclusion of core excited states in manner specified by Lawson in the study of the low-lying positive parity states for 18 O would lead to reproducing the experimental energy levels for these low-lying states better than was obtained with the previous models.