First measurement of the low-energy direct capture in 20Ne(p, {\gamma})21Na and improved energy and strength of the Ecm = 368 keV resonance
First measurement of the low-energy direct capture in 20Ne(p, {\gamma})21Na and improved energy and strength of the Ecm = 368 keV resonance
The $\mathrm{^{20}Ne(p, \gamma)^{21}Na}$ 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 $E\rm_{cm} = 352$~keV, and of the contribution from the $E^{\rm }_{cm} = 368$~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 $\gamma$ rays from the reaction were detected with two high-purity germanium detectors. We obtain a resonance strength $\omega \gamma~=~(0.112 \pm 0.002_{\rm stat}~\pm~0.005_{\rm sys})$~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 $T \geq 0.1$~GK. Initial astrophysical implications are presented.
P. Colombetti、Z. Elekes、J. Skowronski、M. Aliotta、T. Davinson、A. Best、A. Boeltzig、G. F. Ciani、A. Ciapponi、A. Guglielmetti、A. Compagnucci、J. Jos¨|、M. Junker、P. Prati、G. Imbriani、C. G. Bruno、D. Piatti、R. Depalo、P. Corvisiero、Gy. Gy¨1rky、F. Cavanna、Zs. F¨1l?p、L. Schiavulli、E. Masha、A. Formicola、F. Casaburo、M. Lugaro、O. Straniero、L. Barbieri、P. Marigo、D. Rapagnani、V. Rigato、G. Gervino、C. Broggini、C. Ananna、A. Di Leva、V. Paticchio、R. S. Sidhu、L. Csedreki、D. Bemmerer、R. Menegazzo、D. Robb、P. Manoj、F. Ferraro、E. M. Fiore、C. Gustavino、A. Caciolli、T. Sz¨1cs、S. Zavatarelli、F. Barile、M. Campostrini
物理学原子能技术基础理论天文学
P. Colombetti,Z. Elekes,J. Skowronski,M. Aliotta,T. Davinson,A. Best,A. Boeltzig,G. F. Ciani,A. Ciapponi,A. Guglielmetti,A. Compagnucci,J. Jos¨|,M. Junker,P. Prati,G. Imbriani,C. G. Bruno,D. Piatti,R. Depalo,P. Corvisiero,Gy. Gy¨1rky,F. Cavanna,Zs. F¨1l?p,L. Schiavulli,E. Masha,A. Formicola,F. Casaburo,M. Lugaro,O. Straniero,L. Barbieri,P. Marigo,D. Rapagnani,V. Rigato,G. Gervino,C. Broggini,C. Ananna,A. Di Leva,V. Paticchio,R. S. Sidhu,L. Csedreki,D. Bemmerer,R. Menegazzo,D. Robb,P. Manoj,F. Ferraro,E. M. Fiore,C. Gustavino,A. Caciolli,T. Sz¨1cs,S. Zavatarelli,F. Barile,M. Campostrini.First measurement of the low-energy direct capture in 20Ne(p, {\gamma})21Na and improved energy and strength of the Ecm = 368 keV resonance[EB/OL].(2023-11-07)[2025-07-16].https://arxiv.org/abs/2311.04089.点此复制
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