Abstract
Additional experimental information concerning the level structure of Si-26 above the proton threshold is needed to reduce uncertainties in the Al-25(p,gamma)Si-26 reaction rate and consequently better determine Al-26 radioisotope production in astrophysical environments. The Mg-24(He-3,n)Si-26 reaction was measured and excitation energies of states in Si-26 were determined with improved accuracy. Spins were assigned to a number of states by comparing their measured differential cross sections with Hauser-Feshbach cross sections. The 3(+) resonance state of the Al-25(p,gamma)Si-26 reaction was identified at 5912(4) keV excitation energy and the Al-25(p,gamma)Si-26 reaction rate in explosive hydrogen burning environments was calculated.