Nucleosynthesis ofAl26in massive stars: NewAl27states aboveαand neutron emission thresholds
| Autor: | P. Roussel, N. de Séréville, Jürgen Kiener, Vincent Tatischeff, L. Lefebvre, A. M. Sánchez-Benítez, I. Deloncle, Mandira Sinha, M. Assié, Marine Vandebrouck, Alison Laird, A. Coc, A. Lefebvre-Schuhl, I. Stefan, S. Ancelin, G. Mavilla, Fairouz Hammache, L. Perrot, S. Benamara, P. Morfouace, S. P. Fox |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
Nuclear and High Energy Physics 010308 nuclear & particles physics Neutron emission Thermonuclear reaction Context (language use) 7. Clean energy 01 natural sciences Galaxy Nuclear physics Stars 13. Climate action Nucleosynthesis 0103 physical sciences Neutron Ground state 010303 astronomy & astrophysics |
| Zdroj: | Physical Review C. 89 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.89.065805 |
| Popis: | The ${}^{26}\mathrm{Al}$ radioisotope is of great importance for understanding the chemical and dynamical evolution of our galaxy. Among the possible stellar sources, massive stars are believed to be the main producer of this radioisotope. Understanding ${}^{26}\mathrm{Al}$ nucleosynthesis in massive stars requires estimates of the thermonuclear reaction rates of the $^{26}\mathrm{Al}$${(n,p)}^{26}$Mg, $^{26}\mathrm{Al}$${(n,\ensuremath{\alpha})}^{23}$Na, and $^{23}\mathrm{Na}$${(\ensuremath{\alpha},p)}^{26}$Mg reactions. These reaction rates depend on the spectroscopic properties of ${}^{27}\mathrm{Al}$ states above the neutron and alpha thresholds. In this context, the $^{27}\mathrm{Al}$${(p,{p}^{\ensuremath{'}})}^{27}$Al* reaction was studied at 18 MeV using a high-resolution Enge Split-Pole spectrometer. States from the ground state up to excitation energies of $\ensuremath{\approx}$14 MeV were populated. While up to the ${}^{23}\mathrm{Na}$ + $\ensuremath{\alpha}$ threshold no additional states are observed, we report for the first time 30 new levels above the ${}^{23}\mathrm{Na}$ + $\ensuremath{\alpha}$ threshold and more than 30 new states above the ${}^{26}\mathrm{Al}$ + n threshold for which excitation energies are determined with an uncertainty of 4--5 keV. |
| Databáze: | OpenAIRE |
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