{sup 9}Be({rvec p},d){sup 8}Be and {sup 9}Be({rvec p},{alpha}){sup 6}Li reactions at low energies
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255 (United States)
Angular distributions of cross section and vector analyzing power have been measured for the {sup 9}Be({rvec p},d){sup 8}Be and {sup 9}Be({rvec p},{alpha}){sup 6}Li reactions for 77{le}E{sub p}{le}321 keV. Previous work has suggested that the low-energy cross section is enhanced by the E{sub x}=6.57 MeV subthreshold level in {sup 10}B. The analyzing power measurements are particularly sensitive to the presence of the subthreshold level, leading to a definitive test of the hypothesis. The data are analyzed in terms of R-matrix and direct reaction calculations. We find that the magnitude and angular distribution of the {sup 9}Be(p,d){sup 8}Be reaction at very low energies can be explained by the direct reaction mechanism without any contribution from the subthreshold resonance. The implications of these results for the stellar reaction rate of the {sup 9}Be(p,d){sup 8}Be and {sup 9}Be(p,{alpha}){sup 6}Li reactions are discussed. {copyright} {ital 1998} {ital The American Physical Society}
- DOE Contract Number:
- FG02-97ER41041; FG02-88ER40442
- OSTI ID:
- 664917
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 57; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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