Proton-threshold states in27Al and the production of 27Al at low stellar temperatures

Abstract The 26 Mg( 3 He, d) 27 Al reaction has been employed to measure excitation energies and proton spectroscopic factors for states corresponding to 26 Mg + p resonances in the vicinity of the proton-capture threshold. The width ratio Γ γ /Γ was measured for three previously established resonances via a study of the 26 Mg( 3 He, d γ ) 27 Al reaction, and corresponding values of the proton widths were obtained. Combining this information establishes strengths for four of the states lying within 150 keV of the proton threshold. A 26 Mg + p reaction rate is deduced, and its astrophysical implications are discussed.