Abstract
We report in this paper identification of the new isotope $^{233}\mathrm{Ac}$. Uranium targets were irradiated with 28 GeV protons; after rapid retrieval of the target and separation of actinium from thorium, $^{233}\mathrm{Ac}$ was allowed to decay into the known $^{233}\mathrm{Th}$ daughter. Exhaustive chemical purification was employed to permit the identification of $^{233}\mathrm{Th}$ via its characteristic $\ensuremath{\gamma}$ radiations. The half-life derived for $^{233}\mathrm{Ac}$ from several experiments is 2.3\ifmmode\pm\else\textpm\fi{}0.3 min. The production cross section for $^{233}\mathrm{Ac}$ is 100 \ensuremath{\mu}b.RADIOACTIVITY $^{233}\mathrm{Ac}$ produced in $^{238}\mathrm{U}$(p, 4p2n) reaction, measured ${t}_{\frac{1}{2}}$ through daughter nuclide $^{233}\mathrm{Th}$. Natural uranium target, 28 GeV protons, radiochemical separation, Ge(Li) $\ensuremath{\gamma}$ spectroscopy, genetic relationship. Production cross sections of several Th and Ac isotopes.
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