Ab initio many-body calculation of the 7Be(p, γ )8B radiative capture

We apply the ab initio no-core shell model/resonating group method (NCSM/RGM) approach to calculate

the cross section of the ⁷Be(p,γ )⁸B radiative capture. This reaction is important for understanding the

solar neutrino flux. Starting from a selected similarity-transformed chiral nucleon–nucleon interaction

that accurately describes two-nucleon data, we performed many-body calculations that simultaneously

predict both the normalization and the shape of the S-factor. We study the dependence on the number

of ⁷Be eigenstates included in the coupled-channel equations and on the size of the harmonic oscillator

basis used for the expansion of the eigenstates and of the localized parts of the integration kernels. Our

S-factor result at zero energy is on the lower side of, but consistent with, the latest evaluation.