• Open Access

Stellar neutron capture cross sections of K41 and Sc45

M. Heil, R. Plag, E. Uberseder, S. Bisterzo, F. Käppeler, A. Mengoni, and M. Pignatari
Phys. Rev. C 93, 055807 – Published 24 May 2016

Abstract

The neutron capture cross sections of light nuclei (A<56) are important for s-process scenarios since they act as neutron poisons. We report on measurements of the neutron capture cross sections of K41 and Sc45, which were performed at the Karlsruhe 3.7 MV Van de Graaff accelerator via the activation method in a quasistellar neutron spectrum corresponding to a thermal energy of kT=25 keV. Systematic effects were controlled by repeated irradiations, resulting in overall uncertainties of less than 3%. The measured spectrum-averaged data have been used to normalize the energy-dependent (n,γ) cross sections from the main data libraries JEFF-3.2, JENDL-4.0, and ENDF/B-VII.1, and a set of Maxwellian averaged cross sections was calculated for improving the s-process nucleosynthesis yields in AGB stars and in massive stars. At kT=30 keV, the new Maxwellian averaged cross sections of K41 and Sc45 are 19.2±0.6 mb and 61.3±1.8 mb, respectively. Both values are 20% lower than previously recommended. The effect of neutron poisons is discussed for nuclei with A<56 in general and for the investigated isotopes in particular.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 11 January 2016

DOI:https://doi.org/10.1103/PhysRevC.93.055807

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

M. Heil1,*, R. Plag1, E. Uberseder2, S. Bisterzo3,4, F. Käppeler5, A. Mengoni6, and M. Pignatari7,8,†

  • 1GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
  • 2University of Notre Dame, Notre Dame, Indiana, USA
  • 3INAF, Astrophysical Observatory of Turin, 10025 Pino Torinese, Italy
  • 4INFN, Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy
  • 5Karlsruhe Institute of Technology (KIT), Campus North, Institute of Nuclear Physics, P.O. Box 3640, Karlsruhe, Germany
  • 6CERN, CH-1211 Geneva 23, Switzerland
  • 7E. A. Milne Centre for Astrophysics, Department of Physics & Mathematics, University of Hull, Hull HU6 7RX, United Kingdom
  • 8Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, H-1121 Budapest, Hungary

Article Text

Click to Expand

References

Click to Expand
Issue

Vol. 93, Iss. 5 — May 2016

Reuse & Permissions
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 3.0 License. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

×

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×