First measurement of the low-energy direct capture in 20Ne(p, γ)21Na and improved energy and strength of the Ecm = 368 keV resonance

LUNA Collaboration, E. Masha, L. Barbieri, J. Skowronski, M. Aliotta, C. Ananna, F. Barile, D. Bemmerer, A. Best, A. Boeltzig, C. Broggini, C. G. Bruno, A. Caciolli*, M. Campostrini, F. Cavanna, F. Casaburo, G. F. Ciani, A. Ciapponi, P. Colombetti, A. CompagnucciP. Corvisiero, L. Csedreki, T. Davinson, R. Depalo, A. Di Leva, Z. Elekes, F. Ferraro, E. M. Fiore, A. Formicola, Zs Fülöp, G. Gervino, A. Guglielmetti, C. Gustavino, Gy Gyürky, G. Imbriani, J. José, M. Junker, M. Lugaro, P. Marigo, R. Menegazzo, P. Manoj, V. Paticchio, D. Piatti, P. Prati, D. Rapagnani, V. Rigato, D. Robb, L. Schiavulli, R. S. Sidhu, O. Straniero, T. Szücs, S. Zavatarelli

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The 20Ne(p, γ) 21Na reaction is the slowest in the NeNa cycle and directly affects the abundances of the Ne and Na isotopes in a variety of astrophysical sites. Here we report the measurement of its direct capture contribution, for the first time below Ecm = 352 keV, and of the contribution from the Ecm = 368 keV resonance, which dominates the reaction rate at T = 0.03−1.00 GK. The experiment was performed deep underground at the Laboratory for Underground Nuclear Astrophysics, using a high-intensity proton beam and a windowless neon gas target. Prompt γ rays from the reaction were detected with two high-purity germanium detectors. We obtain a resonance strength ωγ = (0.112± 0.002stat ± 0.005sys) meV, with an uncertainty a factor of 3 smaller than previous values. Our revised reaction rate is 20% lower than previously adopted at T < 0.1 GK and agrees with previous estimates at temperatures T ≥ 0.1 GK. Initial astrophysical implications are presented.
Original languageEnglish
Article numberL052801
Pages (from-to)1-7
Number of pages7
JournalPhysical Review C
Issue number5
Publication statusPublished - 22 Nov 2023

Keywords / Materials (for Non-textual outputs)

  • nucl-ex
  • astro-ph.SR


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