In the nova temperature range, 0.1 GK < T < 0.4 GK, several low-energy resonances dominate the 21Ne(p, γ ) 22Na reaction rate, which is currently affected by large uncertainties. We present a high-precision study of the resonances at Elab r = 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.

Improved direct measurement of low-energy resonances in the 21Ne(p, γ) 22Na reaction / Sidhu, R. S.; Casaburo, F.; Masha, E.; Aliotta, M.; Ananna, C.; Barbieri, L.; Barile, F.; Baron, C.; Bemmerer, D.; Best, A.; Biasissi, R.; Boeltzig, A.; Bonnell, R.; Broggini, C.; Bruno, C. G.; Caciolli, A.; Campostrini, M.; Cavanna, F.; Chillery, T.; Ciani, G. F.; Colombetti, P.; Compagnucci, A.; Corvisiero, P.; Csedreki, L.; Davinson, T.; Depalo, R.; Di Leva, A.; D'Ottavi, A.; Elekes, Z.; Ferraro, F.; Formicola, A.; Fülöp, Zs.; Gervino, G.; Gesuè, R.; Gosta, G.; Guglielmetti, A.; Gustavino, C.; Gyürky, Gy.; Imbriani, G.; Jones, J.; José, J.; Junker, M.; Lugaro, M.; Marigo, P.; Marsh, J.; Menegazzo, R.; Mercogliano, D.; Piatti, D.; Prati, P.; Rapagnani, D.; Rigato, V.; Robb, D.; Rossi, M.; Sariyal, R.; Skowronski, J.; Straniero, O.; Szücs, T.; Turkat, S.; Vagnoni, M.; Zavatarelli, S.; Null, Null. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 112:5(2025). [10.1103/vqt1-jxpw]

Improved direct measurement of low-energy resonances in the 21Ne(p, γ) 22Na reaction

Casaburo, F.;
2025

Abstract

In the nova temperature range, 0.1 GK < T < 0.4 GK, several low-energy resonances dominate the 21Ne(p, γ ) 22Na reaction rate, which is currently affected by large uncertainties. We present a high-precision study of the resonances at Elab r = 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.
2025
LUNA, nuclear astrophysics, LNGS
01 Pubblicazione su rivista::01a Articolo in rivista
Improved direct measurement of low-energy resonances in the 21Ne(p, γ) 22Na reaction / Sidhu, R. S.; Casaburo, F.; Masha, E.; Aliotta, M.; Ananna, C.; Barbieri, L.; Barile, F.; Baron, C.; Bemmerer, D.; Best, A.; Biasissi, R.; Boeltzig, A.; Bonnell, R.; Broggini, C.; Bruno, C. G.; Caciolli, A.; Campostrini, M.; Cavanna, F.; Chillery, T.; Ciani, G. F.; Colombetti, P.; Compagnucci, A.; Corvisiero, P.; Csedreki, L.; Davinson, T.; Depalo, R.; Di Leva, A.; D'Ottavi, A.; Elekes, Z.; Ferraro, F.; Formicola, A.; Fülöp, Zs.; Gervino, G.; Gesuè, R.; Gosta, G.; Guglielmetti, A.; Gustavino, C.; Gyürky, Gy.; Imbriani, G.; Jones, J.; José, J.; Junker, M.; Lugaro, M.; Marigo, P.; Marsh, J.; Menegazzo, R.; Mercogliano, D.; Piatti, D.; Prati, P.; Rapagnani, D.; Rigato, V.; Robb, D.; Rossi, M.; Sariyal, R.; Skowronski, J.; Straniero, O.; Szücs, T.; Turkat, S.; Vagnoni, M.; Zavatarelli, S.; Null, Null. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 112:5(2025). [10.1103/vqt1-jxpw]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1753995
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