Simultaneous optical model analysis of elastic scattering, fusion, and breakup for the {sup 9}Be+{sup 144}Sm system at near-barrier energies
- Departamento del Acelerador, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, C. P. 11801, Mexico D. F. Centro (Mexico)
A simultaneous optical model calculation of elastic scattering, complete fusion, and breakup cross sections for energies around the Coulomb barrier is presented for reactions involving the weakly bound projectile {sup 9}Be on the medium size target {sup 144}Sm. In the calculations, the nuclear polarization potential U is split into a volume part U{sub F}, which is responsible for fusion reactions, and a surface part U{sub DR}, which accounts for direct reactions. A simultaneous {chi}{sup 2} analysis of elastic and complete fusion data shows that the extracted optical potential parameters of the real V{sub F} and imaginary W{sub F} parts of U{sub F} and the corresponding parts V{sub DR} and W{sub DR} of U{sub DR} satisfy separately the dispersion relation. Energy-dependent forms for the fusion and direct reaction potentials indicate that, at the strong absorption radius, the direct reaction potentials dominate over the fusion potentials. Moreover, the imaginary direct reaction potential results in a rather smooth function of E around the barrier energy. These findings show that the threshold anomaly, usually present in reactions with tightly bound projectiles, is not exhibited for the system {sup 9}Be+{sup 144}Sm. Within this formalism, the effect of breakup reactions on complete fusion is studied by turning on and off the potentials responsible for breakup reactions.
- OSTI ID:
- 21189993
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 77, Issue 5; Other Information: DOI: 10.1103/PhysRevC.77.054606; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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