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. 2024 Aug 2;133(5):052701.
doi: 10.1103/PhysRevLett.133.052701.

First Direct Measurement of the 64.5 keV Resonance Strength in the ^{17}O(p,γ)^{18}F Reaction

R M Gesuè  1   2 , G F Ciani  3   4 , D Piatti  5   6 , A Boeltzig  7 , D Rapagnani  8   9 , M Aliotta  10 , C Ananna  8   9 , L Barbieri  10 , F Barile  4 , D Bemmerer  7 , A Best  8   9 , C Broggini  6 , C G Bruno  10 , A Caciolli  5   6 , M Campostrini  11 , F Casaburo  12   13 , F Cavanna  14 , P Colombetti  14   15 , A Compagnucci  1   2 , P Corvisiero  12   13 , L Csedreki  16 , T Davinson  10 , G M De Gregorio  17   18 , D Dell'Aquila  8   9 , R Depalo  17   18 , A Di Leva  8   9 , Z Elekes  16   19 , F Ferraro  2 , A Formicola  20 , Zs Fülöp  16 , G Gervino  14   15 , A Guglielmetti  17   18 , C Gustavino  20 , Gy Gyürky  16 , G Imbriani  8   9 , M Junker  2 , M Lugaro  21   22 , P Marigo  5   6 , J Marsh  10 , E Masha  7 , R Menegazzo  6 , D Mercogliano  8   9 , V Paticchio  4 , R Perrino  4 , P Prati  12   13 , V Rigato  11 , D Robb  10 , L Schiavulli  3   4 , R S Sidhu  10 , J Skowronski  5   6 , O Straniero  20   23 , T Szücs  16 , S Zavatarelli  12   13 ; LUNA Collaboration
Affiliations
Free article

First Direct Measurement of the 64.5 keV Resonance Strength in the ^{17}O(p,γ)^{18}F Reaction

R M Gesuè et al. Phys Rev Lett. .
Free article

Abstract

The CNO cycle is one of the most important nuclear energy sources in stars. At temperatures of hydrostatic H-burning (20 MK<T<80 MK) the ^{17}O(p,γ)^{18}F reaction rate is dominated by the poorly constrained 64.5 keV resonance. Here, we report on the first direct measurements of its resonance strength and of the direct capture contribution at 142 keV, performed with a new high sensitivity setup at LUNA. The present resonance strength of ωγ_{(p,γ)}^{bare}=(30±6_{stat}±2_{syst}) peV is about a factor of 2 higher than the values in literature, leading to a Γ_{p}^{bare}=(34±7_{stat}±3_{syst}) neV, in agreement with the LUNA result from the (p,α) channel. Such agreement strengthens our understanding of the oxygen isotopic ratios measured in red giant stars and in O-rich presolar grains.

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