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 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.
First measurement of the low-energy direct capture in 20Ne(p,γ)21Na and improved energy and strength of the Ec.m.=368keV resonance / 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, Z. Fülöp, G. Gervino, A. Guglielmetti, C. Gustavino, G. 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. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 108:5(2023), pp. 1-7. [10.1103/PhysRevC.108.L052801]
First measurement of the low-energy direct capture in 20Ne(p,γ)21Na and improved energy and strength of the Ec.m.=368keV resonance
E. Masha;A. Ciapponi;R. Depalo;F. Ferraro;A. Guglielmetti;
2023
Abstract
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 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.File | Dimensione | Formato | |
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