Thermalization in a closed many-body quantum system

A new high-performance algorithm was recently proposed for calculating level density in interacting many-body systems. It was applied to spin- and parity-dependent shell-model nuclear level densities using methods of statistical spectroscopy. Using this algorithm we analyze the intrinsic thermalization effect in isolated systems of interacting particles. We show examples of the approach and discuss the dependence of the level density on the interaction parameters.