First-Principle Calculations of Astrophysical Reactions

The ability to accurately predict light-ion reaction cross sections is key to a wide range of applications ranging from the modeling of stellar interiors to the measurement of actinide fission properties. Many such reactions remain inaccessible to experimental efforts due to, for example, the low energies at which they take place, leading to reduced reaction rates. A first-principle theory of nuclear reactions combined with an efficient computational capability to calculate their cross sections may provide accurate predictions for these reactions and can assist in providing accredited nuclear data in support of a wide range of nuclear security applications. However, due to the need for high-precision predictions, it is also imperative to provide quantified estimates for calculation uncertainties. In this talk I will outline the basics of the no-core shell model with continuum first-principle approach to light-ion reactions, demonstrate its applicability in cases relevant to astrophysics and applications, and discuss currently ongoing efforts for quantifying theoretical uncertainties.