Abstract
The15N(ρ, α0)12C reaction has been investigated in the energy range ofE p (lab)=78-810keV. The measurement of the excitation functions and α-particle angular distributions involved solid targets as well as a quasi-point supersonic jet gas target. The determination of absolute cross sections has been carried out with the gas target. The observed energy dependence of the total cross sections can be described in terms of two-level Breit-Wigner shapes including the resonances atE p (J π)=335(1−) and 1,028(1−)keV. The data lead to a zero-energy intercept of the astrophysicalS(E) factor ofS(0)= 65±4MeV-b. The angular distributions are asymmetric around 90° and require an additional amplitude in the reaction mechanism, which interferes predominantly with the 335 keV resonance. The origin of this background amplitude is discussed.
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Supported by the Deutsche Forschungsgemeinschaft (Ro 429/13)
Supported by the Minister für Wissenschaft und Forschung des Landes Nordrhein-Westfalen
The authors would like to thank L. Buchmann, J. Görres, M. Hilgemeier, K.U. Kettner, H. Kräwinkel, A. Krauss, A. Vlieks and M. Wiescher for their help during the course of the experiments. We thank also Prof. H. Wäffler (Mainz) for the hospitality and support given for this experiment. It is a pleasure to acknowledge Profs. W.A. Fowler, C.A. Barnes and P.D. Parker for helpful comments and discussions in the early phase of this work. The authors are grateful to the Deutsche Forschungsgemeinschaft for a travelling grant and other support.
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Redder, A., Becker, H.W., Lorenz-Wirzba, H. et al. The15N(p,α 0)12C reaction at stellar energies. Z Physik A 305, 325–333 (1982). https://doi.org/10.1007/BF01419081
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DOI: https://doi.org/10.1007/BF01419081