Orbiting in light heavy ion reactions

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6982360

Ray, A

..gamma..-Ray angular correlations have been measured for strongly damped /sup 12/C(/sup 28/Si,/sup 12/C)/sup 28/Si reactions at theta/sub c.m/ = 180/sup 0/ for E/sub c.m/ = 42.7 MeV and 33.7 MeV. The /sup 12/C(4.44 MeV, J/sup ..pi../ = 2/sup +/) state is found produced almost exclusively in the m = 0 magnetic substrate with respect to the beam axis. Comparison of singles and coincidence yields shows that the /sup 12/C comes out in its ground state most of the time (approx. =70%) resulting in the entire excitation energy approx. =(15-20)MeV appearing in /sup 28/Si. This result is in disagreement with a dinuclear statistical model which predicts maximum yield for m = +/-1 magnetic substrates. If the authors considers a noncompound sticking model where the two nuclei break tangentially without exerting any non-radial force on each other, then he expects that both the nuclei will generally come out in excited states in in m = 0 magnetic substrate with respect to the beam axis. The observed division of excitation energy can be obtained from a phase-space calculation which allows only the population of m = 0 magnetic substrate with respect to the beam axis. The mean spin of /sup 28/Si nuclei in the /sup 12/C(/sup 28/Si,/sup 12/C)/sup 28/Si has been deduced from the measured ratio of ..cap alpha.. to proton yields in coincidence with coincidence with carbon particles detected at theta/sub c.m/ = 180/sup 0/. The mean spin of /sup 28/Si is found to be slightly higher than the predicted value of orbiting sticking model and in reasonable agreement with the prediction of the constrained statistical model.

• Research Organization: Washington Univ., Seattle (USA)
• OSTI ID: 6982360
• Country of Publication: United States
• Language: English

Related Subjects

651420* -- Nuclear Properties & Reactions
A=20-38
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CARBON 12
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CORRELATIONS
DATA
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
EXPERIMENTAL DATA
GAMMA RADIATION
HEAVY ION REACTIONS
INFORMATION
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 24 TARGET
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR MODELS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
OXYGEN 16 REACTIONS
PARTICLE PROPERTIES
RADIATIONS
SILICON 28
SILICON ISOTOPES
SPIN
STABLE ISOTOPES
TARGETS
YIELDS