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Experimental determination of the Al26(n,α)Na23 reaction cross section and calculation of the Maxwellian averaged cross section at stellar temperatures

L. De Smet* and C. Wagemans†

J. Wagemans

J. Heyse‡ and J. Van Gils

  • Department of Subatomic and Radiation Physics, University of Gent, Proeftuinstraat 86, B-9000 Gent, Belgium

  • SCK•CEN, Boeretang 200, B-2400 Mol, Belgium

  • Institute for Reference Materials and Measurements, EC-JRC, Retieseweg 111, B-2440 Geel, Belgium

  • *liesbeth.desmet@gmail.com
  • †cyrillus.wagemans@UGent.be
  • ‡Present address: SCK•CEN, Boeretang 200, B-2400 Mol, Belgium.
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Phys. Rev. C 76, 045804 – Published 25 October, 2007

DOI: https://doi.org/10.1103/PhysRevC.76.045804

Abstract

The Al26(n,α)Na23 reaction cross section has been studied at the linear accelerator GELINA of the Institute for Reference Materials and Measurements in Geel, Belgium, and has been determined up to a neutron energy of about 100 keV using the time-of-flight technique. Six resonances could be observed in this energy region, whereas before only one had been identified experimentally. For four of them, resonance parameters such as resonance energy, total width, area, and spin of the state could be determined. From the obtained Al26(n,α)Na23 cross section data, Maxwellian averaged cross section (MACS) values were calculated by numerical integration. Since neutron induced reactions are among the major destruction mechanisms of Al26 in our Galaxy, these new MACS values contribute to a better understanding of the observed Al26 abundance.

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Phys. Rev. C 76, 045804– Published 25 October, 2007
  • Received 19 February 2007

© 2007 American Physical Society

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