O16(α,Be8)C12Reaction
- 21 June 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 138 (6B), B1394-B1411
- https://doi.org/10.1103/PhysRev.138.B1394
Abstract
Measurements have been made of the differential cross sections for the reactions to the ground state and to the 4.43-MeV first excited state of at nine bombarding energies between 35.5 and 41.9 MeV. The nuclei (in their ground state) were identified by detecting the two breakup alpha particles in coincidence, and by imposing the energy and angular requirements for breakup into a narrow cone. The measurements extend, for the most part, from 18° to 100° (c.m.). The angular distributions display oscillatory behavior with typical separations between peaks of 15° to 20° (c.m.). Strong fluctuations in differential cross sections were observed with changes in incident energy. The ground-state and 4.43-MeV-state yields are uncorrelated, except perhaps at 35.5 MeV where both yields are particularly large. With the exclusion of the 35.5-MeV data, the cross sections integrated from 18° to 100° (c.m.) have mean values of 0.6 mb for the ground-state reaction, and 1.0 mb for the 4.43-MeV-state reaction. The existence of the observed fluctuations refutes the original expectation that simple direct interaction processes would account for the reaction. The results can be qualitatively understood in terms of the statistical theory of compound nuclear reactions, although a substantial nonstatistical component cannot be excluded. The average width of the compound nuclear states, given by the application of the statistical viewpoint to the experimental results, is 1.1 MeV.
Keywords
This publication has 39 references indexed in Scilit:
- (d,Li6) Reactions inC12,O16, andF19at 14.6 MeVPhysical Review B, 1964
- B10(d, Li6)Li6Reaction at Deuteron Energies from 8 to 13.5 MeVPhysical Review B, 1964
- Evidence for "Alpha-Particle" Clusters in Several Nuclei from the () Reaction at 0.91 BeVPhysical Review B, 1963
- Absolute Cross Sections and Angular Distributions for Charged Particles from Lithium-Lithium Nuclear ReactionsPhysical Review B, 1963
- Low lying levels of Li7 and Be8 in the cluster modelNuclear Physics, 1960
- Studies in the α-particle model of nuclei: III. Calculation of the interaction between α-particlesNuclear Physics, 1957
- The Alpha-Particle and Shell Models of the NucleusProceedings of the Physical Society. Section A, 1956
- Excited States of theNucleusPhysical Review B, 1940
- The Alpha-Particle Model of the NucleusPhysical Review B, 1938
- Molecular Viewpoints in Nuclear StructurePhysical Review B, 1937