  The production of transuranium isotopes has been demonstrated at the Isotope
Separation and ACceleration (ISAC) facility. In particular a laser-ionized
$^{239}$Pu beam, extracted from a uranium carbide target, was investigated. The
experimental work was complemented by GEANT4 simulations, modelling the impact
of secondary particles on the creation of transuranium isotopes through
inelastic nuclear reactions. Theoretical production cross sections were derived
and compared to experimental results, leading to a discussion on boundary
conditions for the release of neptunium and plutonium from ISAC uranium carbide
targets.
