Abstract
Measurements of spin relaxation in superfluid 3He-A1 phase as inferred from the decay of magnetic fountain pressure are reported in magnetic fields up to 8 testa and in pressure between 1 and 29 bars. Unlike in the previous experiment1, the magnetic fountain pressure detector is placed in an apparatus containing A1 phase liquid and there is no interface with any other phases of 3He. An abrupt large change in relaxation time observed in the previous experiment is now absent near the middle of A1 phase. This observation supports the idea that the origin of the abrupt change in relaxation time is the presence of A1/A2 interface.
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