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

Physical Review C, ISSN: 2469-9993, Vol: 108, Issue: 5
2023
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Article Description

The Ne20(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 Ec.m.=352 keV, and of the contribution from the Ec.m.=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.

Bibliographic Details

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. Casaburo; F. Cavanna; G. F. Ciani; A. Ciapponi; P. Colombetti; A. Compagnucci; P. 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. Manoj; P. Marigo; R. Menegazzo; V. Paticchio; D. Piatti; P. Prati; D. Rapagnani; V. Rigato; D. Robb; L. Schiavulli; R. S. Sidhu; O. Straniero; T. Szücs; S. Zavatarelli

American Physical Society (APS)

Physics and Astronomy

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