Quasi-Frozen Spin Concept at NICA for EDM Search and Its Matrix Analysis.

The main features of the quasi-frozen spin lattice were calculated in the spinor formalism, such as a spin-tune and a direction of the invariant spin axis. As the radial field perturbations play a crucial role in the EDM measurement procedure, the difference of frozen and quasi-frozen spin lattices was investigated in this regard. [ABSTRACT FROM AUTHOR]