Entrance channel effects by populating resonances in the /sup 26/Al, /sup 29/Si, and /sup 30/Si systems

Journal Article · Thu Dec 31 23:00:00 EST 1981 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.25.313· OSTI ID:5633738

Parks, R L; Thornton, S T; Cordell, K R; Wiedner, C

Excitation functions have been measured for the elastic, recoil, and alpha-particle exit channels for four reactions: /sup 17/O+/sup 12/C (E/sub lab/ = 30.0--57.0 MeV), /sup 16/O+/sup 13/C (E/sub lab/ = 29.5--52.6 MeV), /sup 17/O+/sup 13/C (E/sub lab/ = 30.0--57.0 MeV), and /sup 16/O+/sup 10/B (E/sub lab/ = 42.4--60.1 MeV). The alpha particles were detected at theta/sub lab/ = 10/sup 0/ while the elastic and recoil particles were detected at theta/sub lab/ = 34/sup 0/. Statistical analyses of the data are used to search for correlated, nonstatistical structures in the excitation functions. The resonant properties of three compound nuclei (/sup 26/Al, /sup 29,30/Si) are studied by comparing the excitation energies at which nonstatistical structures are seen when the nuclei are formed via different well matched (in terms of J/sub max/) entrance channels. These resonancelike structures seen in the various entrance channels (for a given compound nucleus) are found to be uncorrelated in excitation energy, thereby implying a dependence upon the properties of the entrance channel. The lack of entrance channel correlations and the short lifetimes of the structures seen are viewed as evidence that the reaction may proceed through a quasimolecule, or that the compound nucleus itself is so highly excited and deformed that its formation is entrance channel dependent.

• Research Organization: Department of Physics, University of Virginia, Charlottesville, Virginia 22901
• OSTI ID: 5633738
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 25:1; 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 PARTICLES
CARBON 12
CARBON 12 TARGET
CARBON 13 TARGET
CARBON ISOTOPES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CORRELATIONS
CROSS SECTIONS
DATA
ELASTIC SCATTERING
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FUNCTIONS
HEAVY ION REACTIONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
OXYGEN 16 REACTIONS
OXYGEN 17 REACTIONS
RECOILS
RESONANCE
SCATTERING
STABLE ISOTOPES
STATISTICAL MODELS
TARGETS