New Study of the Astrophysical Reaction {sup 12}C({alpha},{gamma}){sup 16}O via the {sup 12}C({sup 7}Li,t){sup 16}O Transfer Reaction

The {sup 12}C({alpha},{gamma}){sup 16}O reaction plays an important role in helium burning in massive stars and their evolution. However, despite many experimental studies, the low-energy cross section of {sup 12}C({alpha},{gamma}){sup 16}O still highly uncertain. The extrapolation of the measured cross sections to stellar energies (E{approx}300 keV) is made difficult by the presence of the two sub-threshold states at 6.92 and 7.12 MeV of {sup 16}O. In order to further investigate the contribution of these two-subthreshold resonances to the {sup 12}C({alpha},{gamma}){sup 16}O cross section, we performed a new determination of the {alpha}-reduced widths via a measurement of the transfer reaction {sup 12}C({sup 7}Li,t){sup 16}O at two incident energies, 34 and 28 MeV. The measured and calculated differential cross sections will be presented as well as the obtained spectroscopic factors and the {alpha}-reduced widths.