The 26 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 Al nucleosynthesis in massive stars requires estimates of the thermonuclear reaction rates of the 26 Al(n,p) 26 Mg, 26 Al(n,α) 23 Na, and 23 Na(α,p) 26 Mg reactions. These reaction rates depend on the spectroscopic properties of 27 Al states above the neutron and alpha thresholds. In this context, the 27 Al(p,p ) 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 ≈14 MeV were populated. While up to the 23 Na + α threshold no additional states are observed, we report for the first time 30 new levels above the 23 Na + α threshold and more than 30 new states above the 26 Al + n threshold for which excitation energies are determined with an uncertainty of 4-5 keV.
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