Release time calculations for the SPES direct UCx targetM. Barbui1, A. Andrighetto1, C. Antonucci2, S. Carturan1, F. Cervellera1, S. Cevolani2, M. Cinausero1, P. Colombo3, A. Dainelli1, P. Di Bernardo4, F. Gramegna1, G. Maggioni1, G. Meneghetti3, C. Petrovich2, L. Piga1, G. Prete1, V. Rizzi1, M. Santana-Leitner5, M. Tonezzer1, P. Zanonato1 and D. Zafiropoulos1
1 INFN Laboratori Nazionali di Legnaro, viale dell'Universitá 2, 35020 Legnaro (Pd), Italy
2 ENEA, via M.M. Sole 4, 40129 Bologna, Italy
3 Dipartimento di Ingegneria Meccanica, via Venezia 1, 35131 Padova, Italy
4 Dipartimento di Scienze Chimiche, via Marzolo 1, 35131 Padova, Italy
5 CERN, 1211 Geneva, Switzerland
(Received: January 31, 2007 / Published online: 8 December 2007)
A Direct Target for a mid-term RIB ISOL-type facility is being developed at LNL, in the framework of the R&D for the SPES project . Using a 40 MeV proton beam impinging on a UCx thick target of 2.5 g/cm3 density, a production rate of 1013 in target fissions per second is expected . The crucial point, when short-lived isotopes are produced in the target, is to build systems (target + ion source) with good release properties and high efficiency. Monte Carlo simulations were performed using the GEANT4 toolkit  and the RIBO code  in order to optimize our target geometry and to estimate the average release time.
29.25.Rm - Sources of radioactive nuclei.
24.10.Lx - Monte Carlo simulations (including hadron and parton cascades and string breaking models).
25.85.Ge - Charged-particle-induced fission.
© EDP Sciences, Springer-Verlag 2007