Abstract
The production of ${\mathrm{La}}^{135}$, ${\mathrm{Ba}}^{135m}$, and ${\mathrm{Ba}}^{133m}$ from the nuclear reactions of ${\mathrm{Te}}^{128}$+${\mathrm{C}}^{12}$, ${\mathrm{Te}}^{130}$+${\mathrm{C}}^{12}$, and ${\mathrm{Sn}}^{124}$+${\mathrm{O}}^{16}$ has been measured radiochemically. The function of ${\mathrm{La}}^{135}$ appears to occur by nucleon evaporation following compound nucleus formation. The maximum cross section is consistent with this picture when compared to the maximum cross section for ${\mathrm{Ce}}^{135}$ formation. The maximum cross section for the formation of the barium isotopes is much greater than for formation of the lanthanum and cerium isobars. This would seem to suggest a direct-interaction mechanism for alpha particle emission.
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