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AstrophysicalS(E) factor of8Li (α,n 0)11B and inhomogeneous Big Bang nucleosynthesis

  • Astrophysics
  • Published:
Zeitschrift für Physik A Atomic Nuclei

Abstract

The cross section of the11B(n, α)8Li reaction has been measured atE n=7.6 to 12.6 MeV. The neutron beam was produced via theD(d, n)3He reaction and aBF 3 counter (with naturalB isotopic composition) served both as target for the11B nuclides and as detector for the observation of the delayedα-activity of8Li. The data match well with previous results obtained atE n =12.5 to 20.0 MeV. Using the principle of detailed balance the data were converted to the case of the8Li(α, n 0)11B reaction. The associated astrophysicalS(E) factor is dominated by a resonance atE R=0.58 MeV of widthΓ R =200 keV, withS(E R )=8400 MeV b. ThisS (E R ) value for the n0 channel alone is already three times higher than the constantS(E) factor assumed previously and, thus, strengthens the significance of inhomogeneous Big Bang nucleosynthesis.

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Supported in part by Deutsche Forschungsgemeinschaft (Ro429/ 15-4) and Friedrich Flick Förderungsstiftung

The authors would like to thank A. Asthenopoulos, N. Divis, and N. Papakostopoulos for their efforts in running the accelerator. We appreciate also the help of N. Andreopoulos, G. Prokos, A. Chionakis, and A. Sokos in the setup of the mechanical and electronic components of the experiment. Finally, we thank R.W. Kavanagh (Caltech) for fruitful comments on the manuscript.

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Paradellis, T., Kossionides, S., Doukellis, G. et al. AstrophysicalS(E) factor of8Li (α,n 0)11B and inhomogeneous Big Bang nucleosynthesis. Z. Physik A - Atomic Nuclei 337, 211–220 (1990). https://doi.org/10.1007/BF01294294

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  • DOI: https://doi.org/10.1007/BF01294294

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