<p>The proton -radiative capture reaction ⁶Li (p<i>, γ</i>)⁷Be is of outstanding importance in nuclear physics and astrophysics, in particular in understanding key processes of nucleosynthesis on cosmic scales. This reaction plays a decisive role not only in the early stages of Big Bang Nucleosynthesis (BBN), where the production of light elements is modeled in the first minutes after the Big Bang, but also in stellar fusion chains, in particular in the side branches of the proton-proton chain (pp-chain) in Sun-like stars. In addition, ⁶Li(p<i>,γ</i>)⁷Be acts as one of the channels for the loss of ⁶Li in relatively low-temperature stellar environments and is therefore also of importance in the study of the relative abundances of light elements in the Universe and the chemical evolution of galaxies. At very low energies relevant to astrophysical environments (especially in the range of a few keV), the nuclear cross section is strongly influenced by a range of non-nuclear influences, suppressed by the Coulomb potential and significant quantum mechanical effects. To normalize these effects and extract the intrinsic nuclear behavior, the astrophysical S-factor is used, which describes the behavior of the cross section in a regular manner in the low-energy limit, where the probability of Coulomb penetration is low. In the case of the ⁶Li (p<i>, γ</i>) ⁷Be reaction, the S-factor at sub-Coulomb energies is mainly controlled by electric dipole (E1) transitions from the S-wave input state (in the p + ⁶Li system) to the ground states of ⁷Be with ²P_1/2 and ²P_3/2.</p>