Angular-momentum-dependent level density limitation to fusion

Journal Article · Sun Mar 01 04:00:00 EST 1981 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.23.1074· OSTI ID:6594962

Vandenbosch, R; Lazzarini, A J

Fusion cross sections for the reaction pairs /sup 12/C+/sup 14/N and /sup 10/B+/sup 16/O (leading to /sup 26/Al) and /sup 16/O+/sup 16/O and /sup 12/C+/sup 20/Ne (leading to /sup 32/S) are examined to extract critical angular momenta. At low energies entrance channel effects are present, whereas at higher energies the results are qualitatively consistent with a common limiting angular momentum characteristic of the compound nucleus. Comparison with angular-momentum-dependent level densities suggests that the fusion cross sections at intermediate energy are sensitive to the availability of a sufficient level density in the compound nucleus. A model calculation employing the criterion that the level spacing of a particular angular momentum be comparable to or smaller than the level widths is used to calculate fusion cross sections. The results are in qualitative agreement with experiment, accounting for both the magnitude of the cross sections and the periodicity of the gross structure in /sup 16/O+/sup 16/O.

• Research Organization: Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195
• OSTI ID: 6594962
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 23:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 26
ALUMINIUM ISOTOPES
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORON 10 REACTIONS
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
COULOMB FIELD
CROSS SECTIONS
ELECTRIC FIELDS
ENERGY LEVELS
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
FUNCTIONS
FUSION REACTIONS
HEAVY ION REACTIONS
ISOTOPES
LIGHT NUCLEI
NEON 20 TARGET
NITROGEN 14 TARGET
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
OXYGEN 16 REACTIONS
OXYGEN 16 TARGET
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
SULFUR 32
SULFUR ISOTOPES
TARGETS
YEARS LIVING RADIOISOTOPES