The experimental procedure in which both the experimenter and the subjects are unaware of who is in the control group and who is in the experimental group is referred to the procedure.

double-blind study

Explanation:

According to my research on different experimental procedures, I can say that based on the information provided within the question the procedure that is being defined in the question is called a double-blind study. This (like defined in the question) is a study  in which neither the participants nor the experimenters know who is receiving a particular treatment.

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