## NUCLEI: Nuclear Computational Low-Energy Initiative

The NUCLEI project seeks to advance large-scale nuclear physics computations in order to dramatically increase our understanding of nuclear structure and reactions and the properties of nucleonic matter.

The project researchers use advanced applied mathematics, computer science, and physics to accurately describe the atomic nucleus in its entirety. We employ advanced quantum many-body methods, ranging from ab initio methods such as the nuclear shell model, coupled cluster, in- medium similarity renormalization group, and quantum Monte Carlo, to the density functional methods used to treat complex nuclei and inhomogeneous nucleonic matter. We will develop advanced applied mathematics and computer science to allow the resulting algorithms to perform efficiently on the fastest available computers, optimize the input interactions and operators, and provide reliable uncertainty quantification of the results.

The input interactions and currents developed by us will interface with the multinucleon lattice QCD results as these become available. Such a coupling is critical for providing complete understanding of nuclei and their reactions rooted in the theory of strong interactions; in the long term, this will result in unifying the fields of nuclei and hadrons.

Our computational studies will benefit experimental programs, including existing low-energy nuclear physics facilities, the future Facility for Rare Isotope Beams, Jefferson Laboratory, and neutrino experiments.