Optimization studies of the CERN-ISOLDE neutron converter and fission target system R. Luis, J. G. Marques, T. Stora, P. Vaz and L. Zanini Eur. Phys. J. A, 48 6 (2012) 90 Published online: 22 June 2012 DOI: 10.1140/epja/i2012-12090-9