Abstract
Compact liquid hydrogen, deuterium, and helium targets were constructed for radioisotope beam experiments at RIKEN. Hydrogen, deuterium, or helium gas is liquefied by a Gifford–McMahon cycle refrigerator instead of being supplied as a cryogenic liquid. The liquefied gas is accumulated in a target cell placed at the center of a γ -ray detector array. The targets were operated stably in several experiments.
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