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Neutron physics of the Re/Os clock. II. The (n,n) cross section of Os187 at 30 keV neutron energy

M. Mosconi, M. Heil, F. Käppeler, R. Plag, and A. Mengoni
Phys. Rev. C 82, 015803 – Published 15 July 2010
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Abstract

The inelastic neutron-scattering cross section of Os187 has been determined in a time-of-flight experiment at the Karlsruhe 3.7-MV Van de Graaff accelerator. An almost monoenergetic beam of 30-keV neutrons was produced at the threshold of the Li7(p,n)Be7 reaction. Information on the inelastic channel is required for reliable calculations of the so-called stellar enhancement factor, by which the laboratory cross section of Os187 must be corrected in order to account for the thermal population of low-lying excited states at the temperatures of s-process nucleosynthesis, in particular of the important state at 9.75 keV. This correction represents a crucial step in the interpretation of the Os187/Re187 pair as a cosmochronometer.

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  • Received 14 December 2009

DOI:https://doi.org/10.1103/PhysRevC.82.015803

©2010 American Physical Society

Synopsis

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An ancient clock

Published 15 July 2010

Refining a cosmic clock gives a more accurate reading of the age of our galaxy.

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Authors & Affiliations

M. Mosconi*, M. Heil, F. Käppeler, and R. Plag

  • Karlsruhe Institute of Technology (KIT), Campus Nord, Institut für Kernphysik, D-76021 Karlsruhe, Germany

A. Mengoni

  • International Atomic Energy Agency, Nuclear Data Section, A-1400 Vienna, Austria

  • *Now at Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany; Marita.Mosconi@ptb.de
  • Now at Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany.

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Issue

Vol. 82, Iss. 1 — July 2010

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