Abstract
We describe the loading of a minimum-B-field trap with neutral atomic hydrogen cooled through thermal exchange with liquid-helium surfaces. We monitor the gas during filling and decay by observing the atoms which are ejected from the trap as a result of spin exchange and magnetic dipolar relaxation. The stability of the gas is unaffected if we change the wall coverage from pure /sup 4/He to dilute /sup 3/He//sup 4/He mixtures. The maximum trapped density is 3 x 10/sup 14/cm/sup -3/ at about 100 mK. The limiting decay rate is attributed to dipolar relaxation and found to agree with theory for both magnitude and field dependence.
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