Direct measurements of low-energy resonance strengths of the 23Na(p,γ)24Mg reaction for astrophysics
| Autor: | D. Piatti, Tamás Szücs, A. Best, V. Paticchio, Carlo Broggini, L. Schiavulli, R. Perrino, Frank Strieder, A. Di Leva, M. P. Takács, Roberto Menegazzo, C. Gustavino, E. M. Fiore, Gianluca Imbriani, K. Stöckel, Raffaele Buompane, F. Munnik, A. Guglielmetti, László Csedreki, Oscar Straniero, A. Boeltzig, G. Gervino, F. R. Pantaleo, Thomas Davinson, Davide Trezzi, F. Cavanna, Marialuisa Aliotta, F. Ferraro, I. Kochanek, Gy. Gyürky, Paola Marigo, Sandra Zavatarelli, M. Junker, Daniel Bemmerer, Michael Wiescher, Maria Lugaro, A. Formicola, Zs. Fülöp, J. Balibrea-Correa, G. F. Ciani, C. G. Bruno, Richard deBoer, T. Chillery, Z. Elekes, P. Corvisiero, Antonio Caciolli, Paolo Prati, V. Mossa, Rosanna Depalo |
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| Přispěvatelé: | Boeltzig, A., Best, ANDREAS CHRISTIAN, Pantaleo, F. R., Imbriani, G., Junker, M., Aliotta, M., BALIBREA CORREA, Javier, Bemmerer, D., Broggini, C., Bruno, C. G., Buompane, R., Caciolli, A., Cavanna, F., Chillery, T., Ciani, G. F., Corvisiero, P., Csedreki, L., Davinson, T., Deboer, R. J., Depalo, R., Di Leva, A., Elekes, Z., Ferraro, F., Fiore, E. M., Formicola, A., Fulop, Z., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G., Kochanek, I., Lugaro, M., Marigo, P., Menegazzo, R., Mossa, V., Munnik, F., Paticchio, V., Perrino, R., Piatti, D., Prati, Martia Vittoria, Schiavulli, L., Stockel, K., Straniero, O., Strieder, Frank, Szucs, T., Takacs, M. P., Trezzi, D., Wiescher, M., Zavatarelli, S., Best, A., Balibrea-Correa, J., Prati, P., Strieder, F. |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Experimental nuclear astrophysics Cosmic ray 01 natural sciences Stellar evolution Reaction rate Hydrogen burning Underground nuclear physics Nucleosynthesis 0103 physical sciences Experimental nuclear astrophysics Underground nuclear physics Hydrogen burning Stellar evolution Nuclear astrophysics Asymptotic giant branch 010306 general physics Physics Experimental nuclear astrophysic 010308 nuclear & particles physics Gamma ray Resonance Atmospheric temperature range lcsh:QC1-999 LUNA 13. Climate action Nuclear Astrophysiscs Atomic physics lcsh:Physics |
| Zdroj: | Boeltzig, A, Best, A, Pantaleo, F R, Imbriani, G, Junker, M, Aliotta, M, Balibrea-Correa, J, Bemmerer, D, Broggini, C, Bruno, C G, Buompane, R, Caciolli, A, Cavanna, F, Chillery, T, Ciani, G F, Corvisiero, P, Csedreki, L, Davinson, T, deBoer, R J, Depalo, R, Di Leva, A, Elekes, Z, Ferraro, F, Fiore, E M, Formicola, A, Fülöp, Z, Gervino, G, Guglielmetti, A, Gustavino, C, Gyürky, G, Kochanek, I, Lugaro, M, Marigo, P, Menegazzo, R, Mossa, V, Munnik, F, Paticchio, V, Perrino, R, Piatti, D, Prati, P, Schiavulli, L, Stöckel, K, Straniero, O, Strieder, F, Szucs, T, Takács, M P, Trezzi, D, Wiescher, M & Zavatarelli, S 2019, ' Direct measurements of low-energy resonance strengths of the 23Na(p,γ)24Mg reaction for astrophysics ', Physics Letters B, vol. 795, pp. 122-128 . https://doi.org/10.1016/j.physletb.2019.05.044 Physics Letters B, Vol 795, Iss, Pp 122-128 (2019) Physics Letters B 795(2019), 122-128 |
| Popis: | The NeNa and the MgAl cycles play a fundamental role in the nucleosynthesis of asymptotic giant branch stars undergoing hot bottom burning. The Na 23 ( p , γ ) 24 Mg reaction links these two cycles and a precise determination of its rate is required to correctly estimate the contribution of these stars to the chemical evolution of various isotopes of Na, Mg and Al. At temperatures of 50 ≲ T ≲ 110 MK , narrow resonances at E p = 140 and 251 keV are the main contributors to the reaction rate, in addition to the direct capture that dominates in the lower part of the temperature range. We present new measurements of the strengths of these resonances at the Laboratory for Underground Nuclear Astrophysics (LUNA). We have used two complementary detection approaches: high efficiency with a 4π BGO detector for the 140 keV resonance, and high resolution with a HPGe detector for the 251 keV resonance. Thanks to the reduced cosmic ray background of LUNA, we were able to determine the resonance strength of the 251 keV resonance as ω γ = 482 ( 82 ) μ eV and observed new gamma ray transitions for the decay of the corresponding state in Mg 24 at E x = 11931 keV . With the highly efficient BGO detector, we observed a signal for the 140 keV resonance for the first time in a direct measurement, resulting in a strength of ω γ 140 = 1.46 − 0.53 + 0.58 neV (68% CL). Our measurement reduces the uncertainty of the Na 23 ( p , γ ) 24 Mg reaction rate in the temperature range from 0.05 to 0.1 GK to at most − 35 % + 50 % at 0.07 GK. Accordingly, our results imply a significant reduction of the uncertainties in the nucleosynthesis calculations. |
| Databáze: | OpenAIRE |
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