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Fusion-fission in the /sup 16/O + /sup 40,44/Ca and /sup 32/S + /sup 24/Mg reactions

Technical Report ·
DOI:https://doi.org/10.2172/5273111· OSTI ID:5273111
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In measurements of fully-damped yields for the /sup 16/O + /sup 40,44Ca and /sup 32/S + /sup 24/Mg reactions, evidence for a fusion-fission reaction mechanism were found. The experiments were performed at the Argonne tandem-linac booster facility. Reaction products with masses 22 < A < 36 for the /sup 16/O + /sup 40,44Ca reactions and 10 < A < 28 for the /sup 32/S + /sup 24/Mg reaction were detected and identified using the time-of-flight technique. The /sup 16/O + /sup 40,44Ca reactions were measured at several center-of-mass energies from 49.5 to 62.5 MeV, while the /sup 32/S + /sup 24/Mg data were obtained at a single energy of E/sub cm/ = 60 MeV. The resulting total kinetic energies (calculated assuming two-body kinematics), angular distributions, and mass distributions of the fragments are found to be consistent with a fusion-fission reaction mechanism. An alternative explanation of the yields in terms of a deep-inelastic scattering mechanism is ruled out by the asymmetric nature of the mass distributions: the maximum cross section for the /sup 32/S + /sup 224/Mg reaction is detected in the mass 12 channel whereas the maximum cross sections for deep-inelastic scattering would be expected to occur near the target-projectile mass partition. For the /sup 32/S + /sup 4/Mg reaction at E/sub cm/ = 60 MeV, the fission cross sections is found to be approximately 6% of the evaporation-residue cross section. These results indicate that at higher energies fission competes with light particle evaporation in compound nuclear decay - even in these light systems. 8 refs.
Research Organization:
Argonne National Lab., IL (USA)
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
5273111
Report Number(s):
CONF-860396-11; ON: DE86014611
Country of Publication:
United States
Language:
English

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Related Subjects

651425* -- Nuclear Properties &amp; Reactions
A=20-38
Experimental-- Nuclear Reactions &amp; Scattering-- (-1987)
651525 -- Nuclear Properties &amp; Reactions
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Experimental-- Nuclear Reactions &amp; Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CALCIUM 40 TARGET
CALCIUM 44 TARGET
CHARGED-PARTICLE REACTIONS
COMPOUND NUCLEI
CROSS SECTIONS
DATA
DECAY
DEEP INELASTIC SCATTERING
DIFFERENTIAL CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
ENERGY
ENERGY RANGE
EXPERIMENTAL DATA
FISSION
HEAVY ION REACTIONS
INCOMPLETE FUSION REACTIONS
INELASTIC SCATTERING
INFORMATION
INTERACTIONS
KINETIC ENERGY
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LIQUID DROP MODEL
MAGNESIUM 24 TARGET
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 REACTIONS
PARTICLE INTERACTIONS
SCATTERING
STRIPPING
SULFUR 32 REACTIONS
TARGETS
TIME-OF-FLIGHT METHOD
TRANSFER REACTIONS