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Quasi-free (. cap alpha. ,2. cap alpha. ) reaction induced by 140 MeV alpha particles on /sup 9/Be, /sup 12/C, /sup 16/O, and /sup 20/Ne

Journal Article · · Phys. Rev., C; (United States)
; ; ; ;
Measurements of the (..cap alpha..,2..cap alpha..) reaction on /sup 9/Be, /sup 12/C, /sup 16/O, and /sup 20/Ne targets at E/sub ..cap alpha../=140 MeV were made at 20 angle pairs. The quasi-free knockout mechanism appears to dominate the reaction. The experimental data were analyzed with distorted-wave impulse approximation calculations. The factorization approximation employed in the calculations was tested explicitly and found to be valid. The shapes of the calculated energy sharing spectra are in satisfactory agreement with the data. The predicted absolute cross sections were found to be very sensitive to the cluster-core bound state radius parameter, and a bound state radius R=2.52A/sub c//sup ts1/3/ fm is necessary to obtain absolute spectroscopic factors consistent with existing theoretical values. Several possible explanations for this excessive value are suggested. Comparisons are made with other alpha knockout and transfer reactions.
Research Organization:
Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
OSTI ID:
5388077
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:5; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651325* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651425 -- Nuclear Properties & Reactions
A=20-38
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
ALPHA REACTIONS
ANGULAR DISTRIBUTION
BERYLLIUM 8
BERYLLIUM 9 TARGET
BERYLLIUM ISOTOPES
BOUND STATE
CARBON 12
CARBON 12 TARGET
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
CROSS SECTIONS
DIRECT REACTIONS
DISTORTED WAVE THEORY
DISTRIBUTION
ENERGY RANGE
EVEN-EVEN NUCLEI
IMPULSE APPROXIMATION
ISOTOPES
KNOCK-OUT REACTIONS
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
NEON 20 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16
OXYGEN 16 TARGET
OXYGEN ISOTOPES
QUASI-FREE REACTIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SPECTROSCOPIC FACTORS
STABLE ISOTOPES
TARGETS