Study of the mechanism of /sup 16/O-induced reactions between 140 and 315 MeV incident energies

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6258969

Awes, T C

Reactions induced by /sup 16/O ions on /sup 238/U at incident energies of E/A = 20 MeV have been studied. In coincidence with fission fragments, projectile residues (Li,...,O) have been measured near the grazing angle and double differential cross sections have been measured for energetic p,d,t, and ..cap alpha..-particles. The folding-angle between the two coincident fission fragments is shown to provide information on the linear momentum transfer to the target nucleus. The emission of energetic light particles into the forward direction is shown to be an important aspect of the mechanism of projectile residue emission. However, light particles emitted in coincidence with projectile residues are not the result of a simple quasi-elastic breakup of the projectile. This is shown by a kinematical analysis which demonstrates that a large amount of linear momentum is transferred to the target residue prior to fission. Double differential cross sections have also been measured for energetic p,d,t, and ..cap alpha..-particles emitted in /sup 16/O-induced reactions on targets of Al, Zr, and Au at incident energies of 140, 215, and 310 MeV. The energy and angular distributions are well described by isotropic emission from a moving thermal source. The extracted temperature and velocity parameters are found to vary systematically with the incident energy per nucleon above the Coulomb barrier. The observed trend cannot be explained by compound nucleus emission but instead suggest emission from a source which consists of comparable contributions from target and projectile. Alternatively, the proton energy spectra are compared with a rotation hot spot model, a precompound model, and with a simple knock-out model.

• Research Organization: Michigan State Univ., East Lansing (USA)
• OSTI ID: 6258969
• Country of Publication: United States
• Language: English

Related Subjects

651425 -- Nuclear Properties & Reactions
A=20-38
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651725 -- Nuclear Properties & Reactions
A=90-149
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651925 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
652025* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ALUMINIUM
BARYONS
BREAKUP REACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
CROSS SECTIONS
DATA
DEUTERONS
DIFFERENTIAL CROSS SECTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FISSION FRAGMENTS
GOLD
HADRONS
HEAVY ION REACTIONS
INFORMATION
LINEAR MOMENTUM TRANSFER
METALS
MEV RANGE
MEV RANGE 100-1000
MOMENTUM TRANSFER
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
OXYGEN 16 REACTIONS
PARTICLE PRODUCTION
PRECOMPOUND-NUCLEUS EMISSION
PROTONS
TARGETS
TRANSITION ELEMENTS
TRITONS
URANIUM 238 TARGET
ZIRCONIUM