The role of excited states in rp-process for sd shell nuclei
  We investigate the importance of proton capture on low-lying excited states that are thermally excited in hot stellar environments. In addition to the previously known case of $^{32}$Cl$(p,\gamma)^{33}$Ar we find several other sd-shell nuclei with large stellar enhancement factors. We discuss the uncertainty this introduces into rp-process nucleosynthesis. 
J. Grineviciute, B. A. Brown, H. Schatz
nucl-th