Fusion cross sections for four heavy-ion entrance channels leading to the /sup 23/Na compound nucleus

Journal Article · Sun Jul 01 00:00:00 EDT 1984 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.30.134· OSTI ID:6296729

Mateja, J F; Garman, J; Fields, D E; Kozub, R L; Frawley, A D; Dennis, L C

Excitation functions for the yields of residual nuclei from the /sup 7/Li+/sup 16/O and /sup 9/Be+/sup 14/N reactions have been measured for /sup 7/Li and /sup 14/N laboratory bombarding energies of 12 to 34 MeV and 15 to 63 MeV, respectively. Beginning at Coulomb barrier energies, we find that the total fusion cross section diverges from the total reaction cross section obtained from optical model fits to elastic scattering data. This indicates that the process responsible for fusion cross section limitations in this mass region begins near the Coulomb barrier and becomes progressively more important as the bombarding energy is increased. Comparison of the critical angular momenta deduced from the total fusion cross sections for these and two previously investigated entrance channels which form the /sup 23/Na compound nucleus, /sup 11/B+/sup 12/C and /sup 10/B+/sup 13/C, rules out a compound nucleus limitation at these energies. A systematic study of fusion cross sections in this mass and energy region, together with the results of a previous study of the light particles produced in the /sup 11/B+/sup 12/C and /sup 10/B+/sup 13/C reactions, suggests that competition for entrance channel flux by reactions producing light particles with projectilelike velocities is primarily responsible for the fusion cross section limitations.

• Research Organization: Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505
• OSTI ID: 6296729
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 30:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651323 -- Nuclear Properties & Reactions
A=6-19
Experimental-- Energy Levels & Transitions-- (-1987)
651325* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ALKALI METAL ISOTOPES
BERYLLIUM 9 TARGET
CHARGED-PARTICLE REACTIONS
COULOMB FIELD
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELECTRIC FIELDS
ELECTROSTATIC ACCELERATORS
ENERGY RANGE
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FUNCTIONS
FUSION REACTIONS
HEAVY ION REACTIONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
LITHIUM 7 REACTIONS
MEV RANGE
MEV RANGE 10-100
NITROGEN 14 REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
OPTICAL MODELS
OXYGEN 16 TARGET
SODIUM 23
SODIUM ISOTOPES
STABLE ISOTOPES
TARGETS
VAN DE GRAAFF ACCELERATORS