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

Journal Article · · Phys. Rev. C; (United States)
; ; ;
The structure of high-lying states in /sup 20/Ne has been studied using the /sup 12/C(/sup 12/C, ..cap alpha..)/sup 20/Ne reaction at E( /sup 12/C) = 64 and 80 MeV. The spins and branching ratios to the ..cap alpha..+ /sup 16/O channel were determined by measuring double (..cap alpha..-..cap alpha..) and triple (..cap alpha..-..cap alpha..-..gamma..) angular correlations. The branching ratios for decay to the /sup 12/C+ /sup 8/Be channel were obtained from an ..cap alpha..-/sup 12/C coincidence experiment. In addition to confirming the spins of several lower-lying states, we have made a spin assignment of 8/sup +/ for the state at 18.538 MeV and also suggest assignments to states at 17.259 MeV (7/sup -/), 20.478 MeV (8/sup +/), and 24.378 MeV (7/sup -/). The 13.927-MeV (6/sup +/) state is assigned to the K/sup ..pi../ = 0/sub 2//sup +/ band, and it is suggested that this band also includes the 8/sup +/ state at 20.478 MeV. 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 it has a large /sup 12/C + /sup 8/Be cluster parentage. This state appears to be the 8/sup +/ member of a new 8p-4h band which has the 12.436-MeV (0/sub 6//sup +/) state as its band head and the state at 15.159 MeV as its 6/sup +/ member. The discovery of such a rotational band in /sup 20/Ne with a large /sup 12/C + /sup 8/Be cluster parentage and a large moment of inertia provides the first direct indication of correlations between the ..cap alpha.. clusters in 8p-4h states.
Research Organization:
Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511
OSTI ID:
6043921
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 27:6; ISSN PRVCA
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ALPHA REACTIONS
ANGULAR CORRELATION
ANGULAR MOMENTUM
BRANCHING RATIO
CARBON 12 REACTIONS
CARBON 12 TARGET
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
CORRELATIONS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
GAMMA RADIATION
HEAVY ION REACTIONS
HIGH SPIN STATES
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NEON 20
NEON ISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16
OXYGEN ISOTOPES
PARITY
PARTICLE PROPERTIES
RADIATIONS
SPIN
STABLE ISOTOPES
TARGETS