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  • Letter
  • Open Access

Improved direct measurement of low-energy resonances in the Ne21(p,γ)Na22 reaction

R. S. Sidhu1,2, F. Casaburo3,4, E. Masha5, M. Aliotta1, C. Ananna6,7, L. Barbieri1, F. Barile8,9, C. Baron10,11, D. Bemmerer5 et al. (LUNA Collaboration)

D. Bemmerer5, A. Best6,7, R. Biasissi10,11, A. Boeltzig5, R. Bonnell1, C. Broggini10, C. G. Bruno1, A. Caciolli10,11, M. Campostrini12, F. Cavanna13,*, T. Chillery14, G. F. Ciani9, P. Colombetti13,15, A. Compagnucci14,16, P. Corvisiero3,4, L. Csedreki17, T. Davinson1, R. Depalo18,19, A. Di Leva6,7, A. D'Ottavi18,19, Z. Elekes17,20, F. Ferraro14, A. Formicola21, Zs. Fülöp17, G. Gervino13,15, R. Gesuè14,16, G. Gosta18,19, A. Guglielmetti18,19, C. Gustavino21, Gy. Gyürky17, G. Imbriani6,7, J. Jones1, J. José22,23, M. Junker14, M. Lugaro24, P. Marigo10,11, J. Marsh1, R. Menegazzo10, D. Mercogliano6,7, D. Piatti10,11, P. Prati3,4, D. Rapagnani6,7, V. Rigato12, D. Robb1, M. Rossi3,4, R. Sariyal13, J. Skowronski10,11, O. Straniero25,21, T. Szücs17, S. Turkat10,11, M. Vagnoni21,26, and S. Zavatarelli3,† (LUNA Collaboration)

  • *Contact author: francesca.cavanna@to.infn.it
  • †Contact author: zavatare@ge.infn.it
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Phys. Rev. C 112, L052801 – Published 3 November, 2025

DOI: https://doi.org/10.1103/vqt1-jxpw

Abstract

In the nova temperature range, 0.1 GK <T< 0.4 GK, several low-energy resonances dominate the Ne21(p,γ)Na22 reaction rate, which is currently affected by large uncertainties. We present a high-precision study of the resonances at Erlab=127.3, 271.4, 272.3, 291.5, and 352.6 keV, measured directly at the Laboratory for Underground Nuclear Astrophysics in Italy. The strengths of the 127.3-, 271.4-, and 291.5-keV resonances are consistent with previous measurements within 1σ. However, for the 272.3- and 352.6-keV resonances, we report strength values of (129.9 ± 5.8) meV and (14.9 ± 0.8) meV, respectively, more than a factor of 1.5 higher than literature values. In addition, we report on new branching ratios for the 127.3-, 272.3-, and 352.6-keV resonances, leading to updated decay schemes. Finally, we present a revised thermonuclear reaction rate and investigate its impact on the NeNa nucleosynthesis.

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Phys. Rev. C 112, L052801– Published 3 November, 2025
  • Received 31 May 2025
  • Accepted 27 August 2025
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