Measurement and Statistical Theory Analysis ofFe56(He3, p)andCu63(He3, p)Energy and Angular Distributions-Nuclear Shell Effects
- 23 August 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 139 (4B), B835-B845
- https://doi.org/10.1103/PhysRev.139.B835
Abstract
Thin and targets (approximately 1.5 mg/) were bombarded with 10-MeV particles. The proton energy and angular distributions produced by the and reactions were measured by the particle identification technique. In the statistical theory interpretation of the experimental cross sections both the shape and magnitude of the angular and energy distributions were calculated. Contributions from the (, ) and (, ) reactions were also calculated. Large sections of the measured proton energy and angular distributions (about 90% of the total cross sections) are consistent with the predictions of the statistical theory of compound-nucleus reactions. A conventional statistical theory calculation of the cross sections is generally consistent with the experimental cross sections; however, a similar conventional calculation of the cross sections yields values 50% smaller than the experimental results. Rosenzweig has derived an expression for nuclear level densities which indicates that level densities of nuclei in the immediate vicinity of the doubly closed shell nucleus can be influenced by nuclear shell structure at excitation energies as high as 15 MeV. A second statistical theory calculation of the magnitude and shape of the cross sections, based on the Rosenzweig level density expression, yields calculated cross sections generally consistent with the measured cross sections.
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