Stellar neutron capture cross sections of Ne20,21,22

M. Heil, R. Plag, E. Uberseder, R. Gallino, S. Bisterzo, A. Juseviciute, F. Käppeler, C. Lederer, A. Mengoni, and M. Pignatari
Phys. Rev. C 90, 045804 – Published 24 October 2014; Erratum Phys. Rev. C 92, 019902 (2015)

Abstract

The stellar (n,γ) cross sections of the Ne isotopes are important for a number of astrophysical quests, i.e., for the interpretation of abundance patterns in presolar material or with respect to the s-process neutron balance in red giant stars. This paper presents resonance studies of experimental data in the keV range, which had not been fully analyzed before. The analyses were carried out with the R-matrix code sammy. With these results for the resonant part and by adding the components due to direct radiative capture, improved Maxwellian-averaged cross sections (MACS) could be determined. At kT=30keV thermal energy we obtain MACS values of 240±29,1263±160, and 53.2±2.7 μbarn for Ne20,Ne21, and Ne22, respectively. In earlier work the stellar rates of Ne20 and Ne21 had been grossly overestimated. Ne22 and Ne20 are significant neutron poisons for the s process in stars because their very small MACS values are compensated by their large abundances.

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  • Received 30 November 2012
  • Revised 10 September 2014

DOI:https://doi.org/10.1103/PhysRevC.90.045804

©2014 American Physical Society

Erratum

Erratum: Stellar neutron capture cross sections of Ne20,21,22 [Phys. Rev. C 90, 045804 (2014)]

M. Heil, R. Plag, E. Uberseder, R. Gallino, S. Bisterzo, A. Juseviciute, F. Käppeler, C. Lederer, A. Mengoni, and M. Pignatari
Phys. Rev. C 92, 019902 (2015)

Authors & Affiliations

M. Heil1,*, R. Plag1, E. Uberseder2, R. Gallino3, S. Bisterzo3,4, A. Juseviciute5, F. Käppeler5, C. Lederer6, A. Mengoni7, and M. Pignatari8,†

  • 1GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
  • 2University of Notre Dame, Notre Dame, Indiana, USA
  • 3Dipartimento di Fisica, Università di Torino, Via P. Giuria 1, I-10125, Torino, Italy
  • 4INAF - Astrophysical Observatory of Turin, Strada Osservatorio 20, 10025 Pino Torinese (Turin), Italy
  • 5Karlsruhe Institute of Technology (KIT), Campus North, Institute of Nuclear Physics, P. O. Box 3640, Karlsruhe, Germany
  • 6The University of Edinburgh EH9 3JZ, United Kingdom
  • 7CERN, CH-1211, Geneva 23, Switzerland
  • 8Department of Physics, University of Basel, Basel, Switzerland

  • *Corresponding author: m.heil@gsi.de
  • NuGrid collaboration, http://www.nugridstars.org

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Issue

Vol. 90, Iss. 4 — October 2014

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