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We have used a heater and bolometer to create and detect ballistic heat pulses of spin-polarized hydrogen atoms (Harrow-down). Energy can be effectively coupled from helium-covered walls to the Harrow-down gas without recombination. The energy loss coefficient of Harrow-down on /sup 4/He has been measured to be 0.2 +- 0.1. This technique can be considered as the generation of very-low-velocity atomic beams of Harrow-down, down to 200 mK.

physical review. b, condensed matter

Ballistic heat pulses in spin-polarized atomic hydrogen to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>T</mml:mi><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mn /></mml:math>mK

Ballistic heat pulses in spin-polarized atomic hydrogen toT=200mK