Astrophysical reaction rates forB10(p,α)7Be andB11(p,α)8Be from a direct model

The reactions $^{10}\mathrm{B}$(p,\ensuremath{\alpha}${)}^{7}$Be and $^{11}\mathrm{B}$(p,\ensuremath{\alpha}${)}^{8}$Be are studied at thermonuclear energies using DWBA calculations. For both reactions, transitions to the ground states and first excited states are investigated. In the case of $^{10}\mathrm{B}$(p,\ensuremath{\alpha}${)}^{7}$Be, a resonance at ${\mathit{E}}_{\mathrm{res}}$=10 keV can be consistently described in the potential model, thereby allowing the extension of the astrophysical S-factor data to very low energies. Strong interference with a resonance at about ${\mathit{E}}_{\mathrm{res}}$=550 keV require a Breit-Wigner description of that resonance and the introduction o…