Measurement of the Fe60(n,γ)61Fe Cross Section at Stellar Temperatures

E. Uberseder, R. Reifarth, D. Schumann, I. Dillmann, C. Domingo Pardo, J. Görres, M. Heil, F. Käppeler, J. Marganiec, J. Neuhausen, M. Pignatari, F. Voss, S. Walter, and M. Wiescher
Phys. Rev. Lett. 102, 151101 – Published 17 April 2009

Abstract

Observations of galactic γ-ray activity have challenged the current understanding of nucleosynthesis in massive stars. Recent measurements of Fe60 abundances relative to Alg26 have underscored the need for accurate nuclear information concerning the stellar production of Fe60. In light of this motivation, a first measurement of the stellar Fe60(n,γ)Fe61 cross section, the predominant destruction mechanism of Fe60, has been performed by activation at the Karlsruhe Van de Graaff accelerator. Results show a Maxwellian averaged cross section at kT=25keV of 9.9±1.4(stat)2.8(syst)mbarn, a significant reduction in uncertainty with respect to existing theoretical discrepancies. This result will serve to significantly constrain models of Fe60 nucleosynthesis in massive stars.

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  • Received 20 August 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.151101

©2009 American Physical Society

Authors & Affiliations

E. Uberseder1, R. Reifarth2, D. Schumann3, I. Dillmann4,*, C. Domingo Pardo4,†, J. Görres1, M. Heil2, F. Käppeler4, J. Marganiec4,5,†, J. Neuhausen3, M. Pignatari6,1, F. Voss4, S. Walter4, and M. Wiescher1

  • 1University of Notre Dame, Department of Physics, Notre Dame, Indiana, USA
  • 2GSI Darmstadt, Planckstrasse 1, 64291 Darmstadt, Germany
  • 3Laboratory for Environmental and Radiochemistry, PSI, 5232 Villigen PSI, Switzerland
  • 4Forschungszentrum Karlsruhe, Institut für Kernphysik, Postfach 3640, D-76021 Karlsruhe, Germany
  • 5University of Lodz, Poland
  • 6Keele University, Keele, Staffordshire ST5 5BG, United Kingdom

  • *Present address: Physik-Department E12, Technische Universität München, Garching, Germany.
  • Present address: GSI Darmstadt, Planckstrasse 1, 64291 Darmstadt, Germany.

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Vol. 102, Iss. 15 — 17 April 2009

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