Radiochemical activation techniques were used to study the behavior of projectile fragments formed in the interaction of 44 GeV C12 ions within thick Cu targets. After a short review of the results obtained hitherto with this Cu-target technique, the interaction of 44 GeV C12 with several copper target configurations yielding the deep spallation product Na24 is described. Energetic fragments which are emitted into the laboratory angles 10°≤θ≤45° appear to produce more Na24 (up to nearly one order of magnitude) than calculated with a phenomenological model and an intranuclear cascade model. This enhanced production of Na24 by wide-angle secondaries is only observed for 44 GeV C12 on copper, but not for 25 GeV C12 on copper. Some normalization experiments with 4 GeV He4 and 2.6 GeV p are described.
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