<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>(</mml:mo></mml:mrow><mml:mrow><mml:mn>18</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">F</mml:mi><mml:mo>,</mml:mo><mml:mi>p</mml:mi><mml:mi>α</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>15</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:math>reaction applied to nova γ-ray emission

The ${}^{18}\mathrm{F}(p,\ensuremath{\alpha}{)}^{15}\mathrm{O}$ reaction is recognized to be one of the most important reactions for nova $\ensuremath{\gamma}$-ray astronomy, as it governs the early $E&lt;~511\mathrm{keV}$ $\ensuremath{\gamma}$ emission. However, in the nova temperature regime, its rate remains largely uncertain due to unknown low-energy resonance strengths. We report here the measurement of the ${}^{2}\mathrm{H}{(}^{18}\mathrm{F}{,p)}^{19}\mathrm{F}(\ensuremath{\alpha}{)}^{15}\mathrm{N}$ one-nucleon transfer reaction, induced by a 14-MeV ${}^{18}\mathrm{F}$ radioactive beam impinging on a ${\mathrm{CD}}_{2}$ target; outgoing protons and ${}^{15}\mathrm{N}$ (or $\ensuremath{\alpha}$ particles) were detected in coincidence in two silicon strip detectors. A distorted-wave Born approximation analysis of the data resulted in new limits to the contribution of low-energy resonances to the rate of the ${}^{18}\mathrm{F}(p,\ensuremath{\alpha}{)}^{15}\mathrm{O}$ reaction.