Abstract
We discuss the loading and relaxational decay of spin-up polarized atomic hydrogen (H↑) in a minimum-B-field trap. Our current experiments cover the temperature range from 80 to 225 mK. The maximum obtained density is n 0 = 3×1014cm −3 at T 100mK, corresponding to a total of N = 4×1013 atoms. By covering the walls of the sample cell with either pure 4He or with 3He/4He mixtures it could be demonstrated that the stability of the sample is not sensitive for a variation of the surface adsorption energy by as much as a factor 2.5. Measuring the rate at which Hl is produced in the trap we can accurately determine the dipolar relaxation rate as a function of temperature. We discuss the possibility of optical detection and the prospects for optical cooling of magnetically trapped hydrogen.
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