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/sup 12/C+/sup 12/C structure factor at sub-Coulomb energies

Journal Article · · Phys. Rev. C; (United States)
;
A nuclear projection model that produces generalized doorways in the sub-Coulomb region is used to calculate the modified structure factor S-italic-tilde(E) in /sup 12/C+/sup 12/C down to about 3 MeV c.m. The formation of a compound nucleus is enhanced at energies near those of the generalized doorways which are obtained by coupling the shape resonances to the single and mutual excitation channels of the deformed /sup 12/C nuclei. The agreement between theory and experiment for S-italic-tilde(E) in terms of magnitude and intermediate structure is dependent on the spreading width to complicated states as manifested in the energy averaging interval. The agreement in magnitude is striking in that the cross-section values are as small as 10/sup -3/ mb at 3 MeV c.m. At low energies the nonresonant part of sigma/sub comp/ is dominant, and the monotonic increase in S-italic-tilde(E) with decreasing energy can be attributed to absorption under the barrier. Extrapolation of S-italic-tilde(E) to the astrophysical energy of 1.7 MeV c.m. without a soft core suggests that the resonances will not introduce any dramatic structure. The presence of any prominent structure in this region may point to the need for a repulsive core in the nuclear potential.
Research Organization:
Department of Physics, Islamia University, Bahawalpur, Pakistan
OSTI ID:
6454184
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:3; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASTROPHYSICS
BANACH SPACE
CARBON 12 REACTIONS
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
COULOMB FIELD
CROSS SECTIONS
D STATES
DEFORMED NUCLEI
ELECTRIC FIELDS
ENERGY LEVELS
FUNCTIONS
HAMILTONIANS
HEAVY ION REACTIONS
HILBERT SPACE
MATHEMATICAL OPERATORS
MATHEMATICAL SPACE
MATRICES
NUCLEAR REACTIONS
NUCLEI
NUCLEOSYNTHESIS
OPTICAL MODELS
PHASE SHIFT
QUANTUM OPERATORS
S MATRIX
SCATTERING
SPACE
SYNTHESIS
TARGETS
WAVE FUNCTIONS