11. Hence truly isolated nuclear spins would show negligible rates of " T " 1 relaxation. 12. However, their effect on nuclear spin relaxation results in measurable nuclear Overhauser effects ( NOEs ). 13. The hyperfine interaction is the coupling between the electron spin and the proton's nuclear spin . 14. The microwave spectrum shows numerous lines due to spin transitions, with or without nuclear spin transitions. 15. Isotopes with nuclear spins are more common among the chalcogens selenium and tellurium than they are with sulfur. 16. Observed properties of atoms and molecules were inconsistent with the nuclear spin expected from the proton electron hypothesis. 17. Beta decay leaves the mass number unchanged, so that the change of nuclear spin must be an integer. 18. When the experiment was conducted, four beamlets were found, from which they deduced a nuclear spin of. 19. This allows NDR to cool the nuclear spin system to very low temperatures, often 1 �K or below. 20. As a result, the different nuclear spin states have different energies in a non-zero magnetic field.
