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Measurement of the reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>17</mml:mn></mml:msup></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>20</mml:mn></mml:msup></mml:math>Ne and its impact on the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline…
Background: The ratio between the rates of the reactions ${}^{17}$O${(\ensuremath{\alpha},n)}^{20}$Ne and ${}^{17}$O${(\ensuremath{\alpha},\ensuremath{\gamma})}^{21}$Ne determines whether ${}^{16}$O is an efficient neutron poison for the $s$ process in massive stars, or if most of the neutrons captured by ${}^{16}$O$(n,\ensuremath{\gamma})$ are recycled into the stellar environment. This ratio is of particular relevance to constrain …