Excitation of Giant Resonances in Deuteron Stripping Reactions on 10B far below the Coulomb Barrier

The reaction threshold for deuteron induced reactions on 10 B amounts to 25.2 MeV, which enables an excitation of the giant resonances (GR) in the compound nucleus 12 C even at very low projectile energies. In our recent experimental and theoretical investigations of the 10 B(d,p) 11 B reaction, we have found a strong reaction contribution arising from the giant dipole resonance (GDR) excitation. This kind of transition is only possible due to a significant isospin impurity of the GDR in 12 C. In the present work, we study an influence of the GDR as well as of the giant quadrupole (GQR) excitation on the 10 B(d,p) 11 B reaction cross section for transitions to the ground as well as the first three excited states at astrophysically relevant deuteron energies below 3 MeV. Based on our new measurement of angular distributions and absolute cross sections as well as on experimental results of other authors we have determined the total astrophysical S-factor of the 10 B(d,p) 11 B reaction down to deuteron energies close to zero. Additionally, the importance of the interference between resonant and direct reaction amplitudes is discussed.