Astrophysically importantSi26states studied with the(He3,n)reaction and theAl25(p,γ)Si26reaction rates in explosive hydrogen burning environments

Abstract

Additional experimental information concerning the level structure of $^{26}\mathrm{Si}$ above the proton threshold is needed to reduce uncertainties in the $^{25}\mathrm{Al}(p,\ensuremath{\gamma})^{26}\mathrm{Si}$ reaction rate and consequently better determine $^{26}\mathrm{Al}$ radioisotope production in astrophysical environments. The $^{24}\mathrm{Mg}(^{3}\mathrm{He},n)^{26}\mathrm{Si}$ reaction was measured and excitation energies of states in $^{26}\mathrm{Si}$ 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 $^{25}\mathrm{Al}(p,\ensuremath{\gamma})^{26}\mathrm{Si}$ reaction was identified at $5912(4)\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ excitation energy and the $^{25}\mathrm{Al}(p,\ensuremath{\gamma})^{26}\mathrm{Si}$ reaction rate in explosive hydrogen burning environments was calculated.