The RIB production target for the SPES project

Facilities making use of the Isotope Separator On-Line (ISOL) method for the production of Radioactive Ion Beams (RIB) attract interest because they can be used for nuclear structure and reaction studies, astrophysics research and interdisciplinary applications. The ISOL technique is based on the fast release of the nuclear reaction products from the chosen target material together with their ionization into short-lived nuclei beams. Within this context, the SPES (Selective Production of Exotic Species) facility is now under construction in Italy at INFN-LNL (Istituto Nazionale di Fisica Nucleare — Laboratori Nazionali di Legnaro). The SPES facility will produce RIBs mainly from n-rich isotopes obtained by a 40 MeV cyclotron proton beam (200 μA) directly impinging on a uranium carbide multi-foil fission target. The aim of this work is to describe and update, from a comprehensive point of view, the most important results obtained by the analysis of the on-line behavior of the SPES production target assembly. In particular an improved target configuration has been studied by comparing different codes and physics models: the thermal analyses and the isotope production are re-evaluated. Then some consequent radioprotection aspects, which are essential for the installation and operation of the facility, are presented.

[1]  A. Andrighetto,et al.  A steady-state high-temperature method for measuring thermal conductivity of refractory materials. , 2013, The Review of scientific instruments.

[2]  G. Meneghetti,et al.  Research and development for the SPES target , 2009 .

[3]  M. Comunian,et al.  SPES: The INFN radioactive beam facility for nuclear physics , 2012 .

[4]  Y. Yariv,et al.  Intranuclear cascade calculation of high-energy heavy-ion interactions , 1979 .

[5]  M. Seliverstov,et al.  Investigation of the release properties of MeCx targets at IRIS , 1997 .

[6]  J. Nolen,et al.  Characterization studies of prototype ISOL targets for the RIA , 2005 .

[7]  P. Colombo,et al.  Neutron-rich isotope production using a uranium carbide - carbon nanotubes SPES target prototype , 2013 .

[8]  A. Andrighetto,et al.  Multifoil UCx target for the SPES project --An update , 2006 .

[9]  H. Bilheux,et al.  Laser ion source tests at the HRIBF on stable Sn, Ge and Ni isotopes , 2006 .

[10]  C. Petrovich.  SP-FISPACT2001 A COMPUTER CODE FOR ACTIVATION AND DECAY CALCULATIONS FOR INTERMEDIATE ENERGIES. A CONNECTION OF FISPACT WITH MCNPX. SP-FISPACT2001 UN CODICE PER CALCOLI DI ATTIVAZIONE E DECADIMENTO PER ENERGIE INTERMEDIE. CONNETTENDO FISPACT CON MCNPX. , 2001 .

[11]  A. Ferrari,et al.  FLUKA: A Multi-Particle Transport Code , 2005 .

[12]  H. Bertini.  Low-Energy Intranuclear Cascade Calculation , 1963 .

[13]  M. Jong,et al.  Projectile-fragment yields as a probe for the collective enhancement in the nuclear level density , 1998 .

[14]  G. Prete,et al.  Temperature dependence of yields from multi-foil SPES target , 2011 .

[15]  Lisa Biasetto,et al.  Neutron-rich isotope production using the uranium carbide multi-foil SPES target prototype , 2011 .

[16]  G. Prete,et al.  Off-line emittance measurements of the SPES ion source at LNL , 2011 .

[17]  F. Cerutti,et al.  The FLUKA code: Description and benchmarking , 2007 .

[18]  G. D. Kim,et al.  Design study of 10 kW direct fission target for RISP project , 2014 .

[19]  S. Cevolani,et al.  Fission fragment production from uranium carbide disc targets , 2005 .

[20]  G. Meneghetti,et al.  Ionization efficiency estimations for the SPES surface ion source , 2013 .

[21]  G. Meneghetti,et al.  Off-line ionization tests using the surface and the plasma ion sources of the SPES project. , 2012, The Review of scientific instruments.

[22]  G. Meneghetti,et al.  Calculations and first results obtained with a SiC prototype of the SPES direct target , 2008 .

[23]  R Catherall,et al.  Development of high efficiency Versatile Arc Discharge Ion Source at CERN ISOLDE. , 2010, The Review of scientific instruments.

[24]  J. C. Wang,et al.  Neutron and fragment yields in proton-induced fission of 238U at intermediate energies , 2001 .

[25]  T. Stora,et al.  First successful ionization of Lr (Z = 103) by a surface-ionization technique. , 2013, The Review of scientific instruments.

[26]  H. Ravn,et al.  High-temperature carbide targets for fast on-line mass separation of alkali and noble gas elements , 1979 .

[27]  B. A. Tatum,et al.  ISOL science at the Holifield Radioactive Ion Beam Facility , 2011 .

[28]  E. Galbiati,et al.  Monte Carlo calculations using the Boltzmann Master Equation theory of nuclear reactions , 1996 .

[29]  P. Colombo,et al.  Developing uranium dicarbide–graphite porous materials for the SPES project , 2010 .

[30]  J. Wyss,et al.  The SPES project: a second generation ISOL facility , 2012 .