First direct measurement of resonance strengths in 17O(α, γ)21Ne

Abstract

The reaction 17O(α,γ)21Ne has been measured by in-beam gamma spectroscopy for the first time in the energy range Eα = 750 keV to 1650 keV using highly enriched anodized Ta2(17O)5 targets. Resonances were found at E(α) = 1002 keV, 1386 keV and 1619 keV. Their strengths and primary gamma-ray branchings are given. The new results exclude the low reaction rate of Descouvemont and support the rate of Caughlan and Fowler. Implications for the neutron poisoning efficiency of 16O in the weak s process are discussed.

5 pages, 5 figures, 2 tables, Accepted for publication in Phys. Rev. C

References in corpus (1)

• The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating stars

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• Zero and extremely low metallicity rotating massive stars: evolution, explosion, and nucleosynthesis up to the heaviest nuclei
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• A direct measurement of the 17O(a,g)21Ne reaction in inverse kinematics and its impact on heavy element production
• Constraints on key ${}^{17}$O($\alpha ,\gamma$)${}^{21}$Ne resonances and impact on the weak s-process