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

Published online by Cambridge University Press:  05 March 2013

A. Mengoni ,
M. Mosconi ,
K. Fujii ,
F. Käppeler  and
The n_TOF Collaboration
A. Mengoni*
Affiliation:
International Atomic Energy Agency, Vienna, Austria and CERN, Geneva, Switzerland
M. Mosconi
Affiliation:
Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
K. Fujii
Affiliation:
INFN, Sezione di Trieste and Universitá degli Studi di Padova, Italy
F. Käppeler
Affiliation:
Forschungszentrum Karlsruhe, Germany
The n_TOF Collaboration
Affiliation:
CERN (www.cern.ch/ntof), Geneva, Switzerland
*
C Corresponding author. Email: a.mengoni@iaea.org
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Abstract

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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, abundancesgalaxy: evolutionstars: neutron

Information

Type
s-Process and n Capture
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 250 - 254
Copyright
Copyright © Astronomical Society of Australia 2009

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