Discrete as well as continuum γ -ray energy spectra from the neutron capture by 186 Os, 187 Os, and 189 Os have been taken for the first time at 5 E n 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 F σ for the neutron capture on the 9.75-keV first excited state in 187 Os as a function of stellar temperature, as required to derive the age of the galaxy within the Re-Os chronology.
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