Cluster structure of 8p-4h states in /sup 20/Ne

Thesis/Dissertation · Tue Jan 01 00:00:00 EST 1980

OSTI ID:5983396

Hindi, M M

We have used the /sup 12/C(/sup 12/C,..cap alpha..)/sup 20/Ne reaction to study the cluster structure o fhigh-lying 8p-4h states in /sup 20/Ne. An excitation function at 0/sup 0/ over the range 60 MeV less than or equal to E(/sup 12/C) less than or equal to 80 MeV indicated the selective population of a relatively small number of states. The spins of these states were determined by measuring double and triple angular correlations for the processes /sup 12/C(/sup 12/C,..cap alpha../sup 0/)/sup 20/Ne*(..cap alpha../sub 1/)/sup 16/O and /sup 12/C(/sup 12/C,..cap alpha../sup 0/)/sup 20/Ne*(..cap alpha../sub 1/)/sup 16/O*(..gamma..)/sup 16/O, respectively. In addition to the spins, the above coincidence measurements yielded the decay branching ratios of the /sup 20/Ne* states to various final states in /sup 16/O. The branching ratio for decay to the /sup 12/C + /sup 8/Be channel was obtained from an ..cap alpha..-/sup 12/C double coincidence experiment using the /sup 12/C(/sup 12/C,..cap alpha.. )/sup 20/Ne*(/sup 12/C)/sup 8/Be reaction at E(/sup 12/C) = 80 MeV. In addition to confirming the spins of several low-lying states in /sup 20/Ne, we have assigned spins to states at 16.581 MeV(7/sup -/), 16.616 MeV(7/sup -/), 18.538 MeV(8/sup +/) and 20.478 MeV(8/sup +/), and have suggested spins to states at 17.259 meV(7/sup -/) and 24.378 MeV(7/sup -/). We have assigned the 13.927-MeV(6/sup +/) state to the K/sup ..pi../ = 0/sub 2//sup +/ band, and suggested that the extension of this band to the 8/sup +/ level at 20.478 MeV. We have also assigned the 16.581-meV(7/sup -/) level to the K/sup ..pi../ = 1/sup -/ band starting at the 8.843-MeV(1/sup -/) level. The 18.538-MeV(8/sup +/) state was found to have a large reduced width for decay into /sup 12/C + /sup 8/Be, which, together with its small reduced width for decay to ..cap alpha.. + /sup 16/O/sub g.s./, suggests that this sate has a large component of /sup 12/C + /sup 8/Ce cluster structure.

• Research Organization: Yale Univ., New Haven, CT (USA)
• OSTI ID: 5983396
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEON 20
ENERGY LEVELS
ALPHA PARTICLES
BERYLLIUM 8
BRANCHING RATIO
CARBON 12
CARBON 12 REACTIONS
CARBON 12 TARGET
CLUSTER MODEL
COMPOUND NUCLEI
DECAY
EXPERIMENTAL DATA
LEVEL WIDTHS
MANY-NUCLEON TRANSFER REACTIONS
OXYGEN 16
SPIN
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
BERYLLIUM ISOTOPES
CARBON ISOTOPES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DATA
DIRECT REACTIONS
EVEN-EVEN NUCLEI
HEAVY ION REACTIONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MULTI-NUCLEON TRANSFER REACTIONS
NEON ISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
OXYGEN ISOTOPES
PARTICLE PROPERTIES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
TARGETS
TRANSFER REACTIONS
651423* - Nuclear Properties & Reactions
A=20-38
Experimental- Energy Levels & Transitions- (-1987)