Abstract
The capture reaction3He(α,γ)7Be has been investigated in the energy range ofE c.m. =107 to 1,266 keV. The4He or3He beams of up to 300 μA particle current were incident on3He or4He gas targets, respectively. The gas target systems were all of the windowless and recirculating type. Excitation functions have been obtained with the use of an extended-static gas target, while the measurements ofγ-ray angular distributions involved a quasi-point supersonic jet system. The determination of absolute cross sections has been carried out with both types of gas target systems. Theγ-ray yields in the3He(α,γ)7Be reaction were detected using 80 cm3 Ge(Li) detectors. The data lead to a zero-energy intercept of the astrophysicalS(E) factor ofS(0)=0.30±0.03 keV-b. This result reduces the calculated solar neutrino rate by a factor of 1.76.
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Supported by the Deutsche Forschungsgemeinschaft (Ro 429/2-13)
Supported by the Minister für Wissenschaft und Forschung des Landes Nordrhein-Westfalen
During sabbatical leave 1980/1981
Travel and other support to the project has been given by the National Sciences and Engineering Research Council of Canada
The authors greatly appreciate the help of K. Elix, G. Hulke, A. Krauss, M. Hilgemaier, M. Wiescher and A. Redder during the course of the experiments. We would like to thank W. Verhoeven, H. Baumeister, W. Schreiber and the staff of the mechanical and electrical workshops for their work on the gas target system. We are grateful to B. Cleff and W. Verhoeven for their help in providing high beam currents at the Münster accelerator. Prof. K.W. Hoffmann and the technical staff at the Stuttgart accelerator are thanked for support and help during the course of the experiments. The loan of Ge(Li) detectors from Profs. D. Schwalm (GSI) and H. Röpke (Freiburg) at some stages of the experiments is highly appreciated. We wish to thank S. Dürr (Karlsruhe) for the loan of a special Laval nozzle. The discussions with Prof. W.D. Schmidt-Ott (Göttingen) as well as members of the Max-Planck-Institut für Strömungsforschung (Göttingen) on gas dynamics are highly appreciated. Travel support to the laboratory at Stuttgart was provided in part by the Westfälische Wilhelms-Universität and is highly appreciated. One of the authors (C.R.) also wishes to thank the Graduate School at Ohio State University for support. Moreover, one of us (W.S.R.) wishes to thank the Arbeitsgemeinschaft der Großforschungseinrichtungen, the Hahn-Meitner Institut (Berlin) and the GSI (Darmstadt) for the kind invitation and support during the stay at the Universität Münster. The Westfälische Wilhelms-Universität is thanked by one of the authors (R.E.A.) for support during part of 1978. The authors thank Dawn Fröhlich (NSF) for assistance in typing the ever growing manuscripts. We would like also to thank Prof. H.A. Bethe for the help at some stages of the experiments.
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Kräwinkel, H., Becker, H.W., Buchmann, L. et al. The3He(α,γ)7Be reaction and the solar neutrino problem. Z Physik A 304, 307–332 (1982). https://doi.org/10.1007/BF01421513
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DOI: https://doi.org/10.1007/BF01421513