Tuning the Re/Os Clock: Stellar-Neutron Cross Sections

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Contents Vol 26(3)

doi:10.1071/AS09005

Tuning the Re/Os Clock: Stellar-Neutron Cross Sections

A. Mengoni ^A ^F, M. Mosconi ^B, K. Fujii ^C, F. Käppeler ^D, The n_TOF Collaboration ^B

^A International Atomic Energy Agency, Vienna, Austria and CERN, Geneva, Switzerland
^B Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
^C INFN, Sezione di Trieste and Universitá degli Studi di Padova, Italy
^D Forschungszentrum Karlsruhe, Germany
^E CERN (www.cern.ch/ntof), Geneva, Switzerland
^F Corresponding author. Email: a.mengoni@iaea.org





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Publications of the Astronomical Society of Australia 26(3) 250–254 http://dx.doi.org/10.1071/AS09005
Submitted: 9 January 2009 Accepted: 12 March 2009 Published online: 4 September 2009

Abstract

The neutron-capture cross sections of ^186,187Os have been recently measured at the CERN neutron time-of-flight facility n_TOF for an improved evaluation of the Re/Os cosmo-chronometer. This experimental information was complemented by nuclear model calculations for obtaining the proper astrophysical reaction rates at s-process temperatures. The calculated results and their implications for the determination of the time-duration of nucleosynthesis during galactic chemical evolution is discussed.

Keywords: nuclear reactions, nucleosynthesis, abundances — galaxy: evolution — stars: neutron