Abstract
28 radionuclides produced by spallation of natural copper by 720 MeV $\ensuremath{\alpha}$ particles were investigated by direct $\ensuremath{\gamma}$ counting of irradiated targets. Although the isobaric yield distributions and mass yield curve are similar in many respects to those found in proton spallation, a suppression of yields of neutron deficient products is observed. Several interpretations of this latter phenomenon are critically discussed.NUCLEAR REACTIONS $\mathrm{Cu}(\ensuremath{\alpha}, \mathrm{spallation})$, $E=410, 720$ MeV; measured formation cross sections 28 radionuclides, direct $\ensuremath{\gamma}$ counting, natural target.
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