  We apply the ab initio no-core shell model/resonating group method (NCSM/RGM)
approach to calculate the cross section of the 7Be(p,gamma)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
parameter-free 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.
