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Background: The 17O(p,γ )18F reaction affects the production of key isotopes (e.g., 18F and 18O) in the explosive\udhydrogen burning that powers classical novae. Under these explosive conditions, the reaction rate is dominated by\udcontributions from a narrow resonance at Ec.m. = 183 keV and by the combined contributions of direct capture\udand low-energy tails of broad resonances. At present, the astrophysical reaction rate is not well constrained\udbecause of the lack of data in the energy region appropriate to classical novae.\udPurpose: This study aims at the measurement of the 17O(p,γ )18F reaction cross section in order to determine its\udreaction rate in the temperature region appropriate to explosive hydrogen burning in novae.\udMethod: The 17O(p,γ )18F reaction cross section was measured using both the prompt detection of the emitted\udγ rays and an activation technique. Measurements were carried out at the Laboratory for Underground Nuclear\udAstrophysics (Gran Sasso, Italy)where the strongly reduced cosmic-ray-induced background allows for improved\udsensitivity compared to previous studies.\udResults: The 17O(p,γ )18F reaction cross section was measured in the range Ec.m. = 160 to 370 keV. The strength\udof the Ec.m. = 183 keV resonance, ωγ = 1.67 ± 0.12μeV, was determined with unprecedented precision. The\udtotal S factor was obtained through a combined fit of prompt γ -ray and activation results. An overall global fit\udincluding other existing data sets was also carried out and a recommended astrophysical reaction rate is presented.\udConclusions: The reaction rate uncertainty attained in this work is now below the required precision for nova\udmodels. We verified, following a full set of hydrodynamic nova models, that the abundances of oxygen and\udfluorine isotopes obtained with the present reaction rate are determined with 10% precision and put firmer\udconstraints on observational signatures of novae events

physical review c

Underground study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>O</mml:mi><mml:mprescripts /><mml:none /><mml:mn>17</mml:mn></mml:mmultiscripts><mml:mrow><mml:mo>(</mml:mo><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mmultiscripts><mml:mi>F</mml:mi><mml:mprescripts /><mml:none /><mml:mn>18</mml:mn></mml:mmultiscripts></mml:math>reaction relevant for explosive hydrogen burning

Underground study of theO17(p,γ)F18reaction relevant for explosive hydrogen burning