Nuclear Spin—Lattice Relaxation in Liquid Hydrogen

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Abstract
Measurements are reported of the nuclear spin—lattice relaxation time T1 in pressurized samples of liquid hydrogen. T1 has been measured as a function of density, temperature, and orthohydrogen concentration in the temperature range 20.7° to 31.2°K. The data are compared with some theoretical calculations of Deutch, based on the Bloom—Oppenheim theory of nuclear spin—lattice relaxation. The density dependence of (T1) ortho—para is found to be opposite to that of (T1) ortho—ortho at constant temperature. This inverted density dependence is discussed and compared with an inverted ``temperature'' dependence reported by other workers.