I. Measurements on the nuclear magnetism in liquid HE_. II. A HE_ cryostat for nuclear magnetic resonance measurements

[摘要] The technique of adiabatic fast passage has been used to measure the nuclear susceptibility of liquid He3. Measurements along the vaporization curve from 1.2°K to 2.1°K indicate that anti-parallel alignment of the He3 spin system in this temperature range is more important than suggested by previous measurements. Unless existing data at temperatures below 1°K are incorrect, it appears that the susceptibility of He3 is not given precisely by the ideal Fermi-Dirac expression.A He3 cryostat has been constructed to extend the measurements to lower temperatures. Both the operating characteristics of a preliminary cryostat and the design of the final cryostat are discussed.

[发布机构] Rice University