title: Symmetries of the master equation and long-lived states of nuclear spins.
abstract: In terms of the master equation of relaxation, long-lived states in systems of n interacting spin-1/2 nuclei are described as those with eigenvalues much less than the characteristic T(1) rate. It is demonstrated that degeneracies of correlations between interacting dipole-dipole pairs are responsible for their presence. The case n=3 is considered in full detail.
authors: Sir Peter Mansfield Magnetic Resonance Centre, School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom. karabanov@hotmail.co.uk
authors: Alexander A
authors: AA
authors: Karabanov
authors: Christian
authors: C
authors: Bretschneider
authors: Walter
authors: W
authors: Köckenberger