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The effects of electron screening and resonances in (p, α) reactions on10B and11B at thermal energies

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

The fusion reactions10B(p, α)7Be and11B(p, α)8Be have been studied over the c.m. energy range E=17 to 134 keV using intense proton beams and thick solid targets. In the case of11B(p, α)8Be the low-energy data in terms of the astrophysical S(E) factor show an exponential enhancement (up to a factor of 1.9) due to the effects of electron screening, where the deduced screening potential is larger than expected. In the case of10B(p, α)7Be the low-energy data exhibit an enhancement by more than a factor of 200, which cannot be explained by the effects of electron screening. The enhancement arises here from the high-energy tail of an expecteds-wave resonance at ER=10 keV. The results offer an improved prospect for this reaction as advanced fuel in future fusion reactors than previously envisioned.

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Author notes

  1. E. Somorjai

    Present address: Institute of Nuclear Research, Hungarian Academy of Sciences, Debrecen, Hungary

Authors and Affiliations

  1. Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum, Postfach 102148, W-4630, Bochum 1, Germany

    C. Angulo, S. Engstler, G. Raimann, C. Rolfs, W. H. Schulte & E. Somorjai

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  1. C. Angulo
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  2. S. Engstler
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  3. G. Raimann
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  4. C. Rolfs
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  5. W. H. Schulte
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  6. E. Somorjai
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Additional information

Supported in part by the Deutsche Forschungsgemeinschaft (Ro429/18-2 and Ro429/21-3) and the Comision Interministerial de Ciencia y Tecnologia (AEN90-0932)

The authors would like to thank H.W. Becker, K. Langanke, and H.P. Trautvetter for many discussions and H. Baumeister and B. Hippert for the production of the boron targets. We are also grateful to M. Bahr, M. Berheide, U. Greife, M. Junker, J. Meijer, G. Quathamer, G. Roters, T. Schange, S. Schmidt, and D. Zahnow for help during the course of the experiments. We also thank M. Wielunski for assistance in the analyses of the boron targets and M. Buschmann for help in the data analysis.

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Angulo, C., Engstler, S., Raimann, G. et al. The effects of electron screening and resonances in (p, α) reactions on10B and11B at thermal energies. Z. Physik A - Hadrons and Nuclei 345, 231–242 (1993). https://doi.org/10.1007/BF01293350

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  • DOI: https://doi.org/10.1007/BF01293350

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