(Li-6, d) and (Li-6, t) reactions on Ne-22 and implications for s-process nucleosynthesis

We studied alpha cluster states in 26Mg via the 22Ne(6Li, d gamma ) 26Mg reaction in inverse kinematics at an energy of 7 MeV/nucleon. States between Ex = 4-14 MeV in 26Mg were populated and relative alpha spectroscopic factors were determined. Some of these states correspond to resonances in the Gamow window of the 22Ne(alpha,n)25Mg reaction, which is one of the main neutron sources in the astrophysical s-process. Using our new 22Ne(alpha,n)25Mg and 22Ne(alpha, gamma ) 26Mg reaction rates, we performed new s-process calculations for massive stars and asymptotic giant branch stars and compared the resulting abundances with the abundances obtained using other 22Ne +alpha rates from the literature. We observe an impact on the s-process abundances up to a factor of three for intermediatemass AGB stars and up to a factor of ten for massive stars. Additionally, states in 25Mg at Ex < 7.5 MeV are identified via the 22Ne(6Li, t)25Mg reaction for the first time. We present the (6Li, t) spectroscopic factors of these states and note similarities to the (d, p) reaction in terms of reaction selectivity.