Neutron capture cross sections of Os186, Os187, and Os189 for the Re-Os chronology

Details Neutron capture cross sections of Os186, Os187, and Os189 for the Re-Os chronology Neutron capture cross sections of Os186, Os187, and Os189 for the Re-Os chronology

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrvc..76b2802s&link_type=abstract

Physical Review C, vol. 76, Issue 2, id. 022802

Physics

7

Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 150<=A<=189, X- And Gamma-Ray Spectroscopy

Scientific paper

Discrete as well as continuum γ-ray energy spectra from the neutron capture by Os186, Os187, and Os189 have been taken for the first time at 5⩽En⩽90 keV by an anti-Compton NaI(Tl) spectrometer. The detection of a weak discrete γ-ray, about 0.5% of total γ-ray strength, demonstrates the high sensitivity of the present measurement. The energy spectra enabled us to accurately determine the reaction cross sections with a small systematic uncertainty. Based on the new cross sections, we reestimate on the basis of a careful reaction cross section calculation the correction factor Fσ for the neutron capture on the 9.75-keV first excited state in Os187 as a function of stellar temperature, as required to derive the age of the galaxy within the Re-Os chronology.

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