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Entrance channel limit on the fusion of /sup 28/Si with /sup 12/C at high energy

Journal Article · · Phys. Rev. C; (United States)
; ; ; ;
Cross sections for the fusion of /sup 28/Si+/sup 12/C have been measured at center of mass bombarding energies of 39, 43.5, 48, and 54 MeV. Velocity and energy spectra of reaction products having charge Z > or =12 and mass number A > or =24 were studied at several angles between theta/sub lab/ = 2/sup 0/ and 13/sup 0/. Separation of fusion from other processes was made by comparison of kinematic calculations to measured spectra. The extracted critical angular momentum (l/sub cr//sup fus/) of 22h-dash-bar indicates the existence of an entrance-channel-imposed limit on the high energy fusion cross section. More symmetric systems forming the same compound nucleus, /sup 40/Ca, have considerably larger limiting angular momenta. This result is consistent with the previous observation of a maximum angular momentum of 22h-dash-bar (relative to the entrance channel) for the orbiting dinuclear complex found in studies of back-angle deeply inelastic scattering of /sup 28/Si and /sup 12/C.
Research Organization:
Department of Physics, University of Virginia, Charlottesville, Virginia 22901 and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
OSTI ID:
5495535
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 34:2; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651425* -- Nuclear Properties & Reactions
A=20-38
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651523 -- Nuclear Properties & Reactions
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Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CALCIUM 40
CALCIUM ISOTOPES
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
COULOMB FIELD
CROSS SECTIONS
DATA
DEEP INELASTIC SCATTERING
DISTRIBUTION
ELECTRIC FIELDS
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
EVAPORATION MODEL
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
INELASTIC SCATTERING
INFORMATION
INTERACTIONS
ISOTOPES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
PARTICLE INTERACTIONS
SCATTERING
SILICON 28 TARGET
SPECTRA
STABLE ISOTOPES
TARGETS