Browsing 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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    The Atomic Nucleus: Janusian Aspects and Human Existence
    (Obafeml Awolowo University Press, 1991-01-26) Amusa, A.
    An inaugural lecture can take various forms depending on the speaker, his interests, and his disposition to problems in his field. Some of the several forms it can take are as follows: • an exposition of the past and I or ongoing scholastic efforts of the Professor, • an exposition of what one would like to be, a future direction of research and development in one's area of work internationally or within one's nation. • an exposition of past, present works and / or future projections in areas related to, or that could be beneficial to one's specialty. • an exposition of special or specific problems facing one's specialty with a view to -amelioratingthem and thus leading to maximum benefit sbeing derived from efforts in one's field, and • a general historical and philosophical overview of one's specialty for the sole purpose of enlightening the public and perhaps helping to make meaningful future projections in one's field. Before we go into the actual form adopted for this discourse, it would be useful to pass some remarks which could help this august audience in seeing the need for the choice made herein., This speaker became a Professor of Nuclear Physics more than fifteen years ago. He could thus be tagged an 'old' Professor as opposed to a 'recent' or 'eaglet' Professor on campus. Given this length of one's tenure as a Professor, it is/perhaps not totally inappropriate if anyone has a tendency to regard this lecture as belonging to the valedictory genre as opposed to its being an inaugural one. This is, however, an inaugural lecture even though a form suited to a valedictory lecture is adopted here. The obvious advantage of this approach is that one is able to focus better on the peculiarity, and .problems in one's field based on 'one's experience world - wide and in this our Third World setting.
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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.