Entanglement and correlation in two-nucleon systems

We examine the mode entanglement and correlation of two fermionic particles. study one- two-mode entropy a global characteristic, one-body entropy. consider not only angular momentum coupled states with single configuration but use interaction method. With help Slater decomposition, we derive analytical expressions for measures. show that when total is zero specific configurations describe maximally entangled states. It turns out finite number associated modes entropies have identical values. In shell model framework, numerically valence neutrons in $sd$ shell. The ground state close to maximal value largest mutual information.