Doorway states and cross-section fluctuations in the /sup 12/C(/sup 16/O,. cap alpha. ) reaction

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.34.1366· OSTI ID:5172216

Bonetti, R; Fioretto, E; De Rosa, A; Inglima, G; Sandoli, M

It is suggested that the deviations from pure Hauser-Feshbach predictions found in the already published analysis of /sup 12/C(/sup 16/O,..cap alpha..) data might be due to neglect of important multistep compound contributions. An appropriate multiclass fluctuation analysis clearly indicates the presence of two correlation widths, which can be associated with the population of two classes of overlapping states: one made up of doorway states, revealed by the largest of the observed coherence widths, and another made up of compound nucleus states connected with the fine structure of the fluctuating excitation functions. This interpretation was reinforced by new measurements on both excitation functions and complete ..cap alpha.. spectra. In addition, comparison of these data with calculations based on the quantum statistical multistep compound theory confirmed the importance of precompound effects and shed light on the nature of such doorway states which were found to be made up of 5p-1h configurations. These results support the hypothesis of Voit et al. that the first interaction between such light heavy-ion systems is dominated by the formation of ..cap alpha..-particle doorway states.

• Research Organization: Istituto di Fisica Generale Applicata dell'Universita-grave-accent degli Studi di Milano, Milano, Italy
• OSTI ID: 5172216
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 34:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651325* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA SPECTRA
ANGULAR DISTRIBUTION
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CORRELATION FUNCTIONS
CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
EXCITATION FUNCTIONS
FUNCTIONS
HAUSER-FESHBACH THEORY
HEAVY ION REACTIONS
MATHEMATICAL MODELS
NUCLEAR REACTIONS
NUCLEAR THEORY
OXYGEN 16 REACTIONS
SCATTERING
SPECTRA
STATISTICAL MODELS
TARGETS