Study of entrance channel effects by populating resonances in the /sup 26/Al, /sup 29/Si and /sup 30/Si systems
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) and /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/ /sup 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 resonance-like structures seen in the various entrance channels (for a given compound nucleus) are found to be uncorrelated in excitation energy, thereby inplying a dependence upon the angular momentum brought into the reaction. 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:
- Virginia Univ., Charlottesville (USA)
- OSTI ID:
- 6259535
- Country of Publication:
- United States
- Language:
- English
Similar Records
Entrance channel dependence of back angle yields: Orbiting in /sup 24/Mg+ /sup 16/O reaction
Entrance channel dependence of back angle yields: orbiting in /sup 24/Mg+/sup 16/O reaction
Related Subjects
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ALUMINIUM 26
ALUMINIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORON 10 TARGET
CARBON 12 TARGET
CARBON 13 TARGET
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
DATA
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FUNCTIONS
HEAVY ION REACTIONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXYGEN 16 REACTIONS
OXYGEN 17 REACTIONS
RADIOISOTOPES
RESONANCE
SECONDS LIVING RADIOISOTOPES
SILICON 29
SILICON 30
SILICON ISOTOPES
STABLE ISOTOPES
TARGETS
YEARS LIVING RADIOISOTOPES