Cluster model of A=7 nuclei revisited, and the astrophysical S factors for 3 He(α, γ)7 Be and 3 H(α, γ)7 Li at zero energy

A elementary cluster model that visualizes an alpha particle interacting with a 3 H of 3 He cluster via a local potential is employed. An assurance is made that the major requirements of the Pauli principle are satisfied by choosing relative motion quantum numbers N (Principal Quantum Number) and L to correspond to the microscopic situation in which the 3 H or 3 He nucleons occupy shell-model orbitals above the (O)- orbitals filled by the alpha particles. The So factor for the capture reactions 3 He (α,γ)7 Be and 3 H (α,γ)7 Li is calculated by considering only electric dipole capture from incident s-waves as follows. (author)