BNL-32165-DISCLAIMER He have measured the production cross sections for 233 Tfc and 231 Th froo the boabardaent of Z38 U with 3H« iona at 46-, S3-, and 60-HeV at the Brookhaveo 60-in. isochronous cyclotron. He have also attempted to observe the decay of 233 Ac produced via z 3^O(3Ha,^B) or equivalent reactions using 61 HeV 3 He ions by first separating thorium from actinium and then performing chemical purifications on the second thorium sample into which the actinium has decayed. In the four experiments we performed, three gave results consistent with the S half-life of " 3 Ac somewhat longer than 120 a and the production cross section from this target-pxojectile combination in the order of 1-2 ub.
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