Akademik Veri Yönetim Sistemi
ANNALS OF PHYSICS, cilt.391, ss.263-277, 2018 (SCI-Expanded)
We have analyzed the elastic scattering angular distributions data of the alpha+C-12 reaction over a wide energy range (E-lab = 28.2 to 35.5 MeV) within the framework of the Optical Model formalism. A double folding (DF) type real potential was used with a phenomenological Woods-Saxon-squared (WS2) type imaginary potential. Good agreement between the calculations and experimental data was obtained. By using the real DF potential we have calculated the properties of the alpha-cluster states in O-16 by using the Gamow code as well as the alpha-decay widths by using the WKB method. We implemented a C-12+alpha cluster framework for the calculation of the excitation energies and decay widths of O-16 as a function of the orientation of the planar C-12 nucleus with respect to the alpha-particle. These calculations showed strong sensitivity of the widths and excitation energies to the orientation. Branching ratios were also calculated and though less sensitive to the C-12 orientation, it was found that C-12(gs) + alpha structure, with the alpha-particle orbiting the C-12 in its ground state, is dominant. This work demonstrates that deformation, and the orientation, of C-12 plays a crucial role in the understanding of the nature of the alpha-cluster states in O-16. (C) 2018 Elsevier Inc. All rights reserved.