2016/01/25 by G. X. Dong, N. Michel, K. Fossez +3
Physics and Astronomy · #nucl-th
paper · pdf · doi:10.1088/1361-6471/aa5f24
published as J. Phys. G: Nucl. Part. Phys. 44 045201 (2017) · arXiv admin note: text overlap with arXiv:1502.01631
arxiv created 2016/01/25 · arxiv updated 2017/07/31
According to standard stellar evolution, lithium abundance is believed to be a useful indicator of the stellar age. However, many evolved stars like red giants show huge fluctuations around expected theoretical abundances that are not yet fully understood. The better knowledge of nuclear reactions that contribute to the creation and destruction of lithium can help to solve this puzzle. In this work we apply the Gamow shell model (GSM) formulated in the coupled-channel representation (GSM-CC) to investigate the mirror radiative capture reactions 6Li(p,γ)7Be and 6Li(n,γ)7Li. The cross-sections are calculated using a translationally invariant Hamiltonian with the finite-range interaction which is adjusted to reproduce spectra, binding energies and one-nucleon separation energies in 6-7Li, 7Be. All relevant E1, M1, and E2 transitions from the initial continuum states to the final bound states J=3/21- and J=1/2- of 7Li and 7Be are included. We demonstrate that the s-wave radiative capture of proton (neutron) to the first excited state Jπ=1/21+ of 7Be (7Li) is crucial and increases the total astrophysical S-factor by about 40 %.