Adiabatic processes demagnetization

In Section 3 the Zeeman polarization-enhanced method is discussed. The method demonstrates its efficiency when spin-lattice relaxation time of the NQR spin-system is long enough to ensure the feasibility of the adiabatic demagnetization process. 

Then the sample is removed from the field of the magnets. To preserve the proton polarization, the demagnetization process is carried out adiabatically dB/dt < 7h 1oc/ where 7h is the gyromagnetic ratio for protons, Bioc is the mean local dipole field at the sites of protons). The value of the permanent magnetic field inside the sample slowly decreases finally reaching the value oiB 2tivn/7h-The entropy of the Zeeman proton reservoir at this moment is determined by expression... 

William Francis Glauque, 1895-1982, was an American chemist who discovered that ordinary oxygen consists of three Isotopes. He received the 1949 Nobel Prize In chemistry for pioneering the process of adiabatic demagnetization to attain low temperatures. 

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