15C: from Halo-EFT structure to the study of transfer, breakup and radiative-capture reactions
Abstract
Aside from being a one-neutron halo nucleus, 15C is interesting because it is involved in reactions of relevance for several nucleosynthesis scenarios. The aim of this work is to analyze various reactions involving 15C, using a single structure model based on Halo EFT. To develop a Halo-EFT model of 15C at NLO, we first extract the ANC of its ground state by analyzing 14C(d,p)15C transfer data at low energy. Using this Halo-EFT description, we study the 15C Coulomb breakup at high (605AMeV) and intermediate (68AMeV) energies using eikonal models with a consistent treatment of nuclear and Coulomb interactions at all orders, and proper relativistic corrections. Finally, we study the 14C(n,γ)15C radiative capture. Our theoretical cross sections are in good agreement with experimental data for all reactions, thereby assessing the robustness of the 15C Halo-EFT model. Since a simple NLO description is enough to reproduce all data, the only nuclear-structure observables that matter are the binding energy and its ANC, showing that all the reactions considered are purely peripheral. In particular, it confirms the ANC value obtained for the 15C ground state: 1.590.06fm-1. Our model provides also a new estimate of the radiative-capture cross section at astrophysical energy (23.3keV): 4.660.14μb. Including a Halo-EFT description of 15C within precise models of reactions is confirmed to be an excellent way to relate the nucleus reaction cross sections and structure. Its systematic expansion enables us to deduce which nuclear-structure observables are actually probed in the collision. From this, we can infer valuable information on both the structure of 15C and its synthesis through the 14C(n,γ)15C radiative capture at astrophysical energies.
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