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 / R.S. Sidhu, F. Casaburo, E. Masha, M. Aliotta, C. Ananna, L. Barbieri, F. Barile, C. Baron, D. Bemmerer, A. Best, R. Biasissi, A. Boeltzig, R. Bonnell, C. Broggini, C.G. Bruno, A. Caciolli, M. Campostrini, F. Cavanna, T. Chillery, G.F. Ciani, P. Colombetti, A. Compagnucci, P. Corvisiero, L. Csedreki, T. Davinson, R. Depalo, A. Di Leva, A. D'Ottavi, Z. Elekes, F. Ferraro, A. Formicola, Z. Fülöp, G. Gervino, R. Gesuè, G. Gosta, A. Guglielmetti, C. Gustavino, G. Gyürky, G. Imbriani, J. Jones, J. José, M. Junker, M. Lugaro, P. Marigo, J. Marsh, R. Menegazzo, D. Mercogliano, D. Piatti, P. Prati, D. Rapagnani, V. Rigato, D. Robb, M. Rossi, R. Sariyal, J. Skowronski, O. Straniero, T. Szücs, S. Turkat, M. Vagnoni, S. Zavatarelli, N. Null. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 112:5(2025 Nov 03), pp. L052801.1-L052801.7. [10.1103/vqt1-jxpw]
Improved direct measurement of low-energy resonances in the 21Ne(p,γ)22Na reaction
E. Masha;R. Depalo;F. Ferraro;G. Gosta;A. Guglielmetti;
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.
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