A refrigerated gas target apparatus for 180° electron scattering

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Abstract

A gas target system for use with 180° electron scattering experiments is described. The target gas is cooled to 77°K and maintained at about 4.4 atm with 6 μm havar foils separating the gas from the vacuum of the main target chamber. A gas transfer feature using liquid helium trapping is employed. The successful use of this apparatus in experiments with 20Ne, 3He, and 4He is discussed. Salient features of an improved gas target design, now being tested, are also given.

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