ISOFAZIA, N. Le Neindre, S. Piantelli
ISOFAZIA - Isospin transport in heavy ion collisions at Fermi energies with a demonstrator of FAZIA
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(FAZIA Collaboration)
An experiment aiming at the investigation of isospin transport phenomena in heavy ion collisions at Fermi energies is proposed. It will be performed with four complete FAZIA 1 blocks, each composed of 16 three-layer telescopes (Si(300m)- Si(500m)-Csi(Tl)(10cm)), fully equipped with digital electronics. The test experiments performed by the FAZIA Collaboration in 2009, 2011 and 2012 at LNS in Catania and in 2010 at GANIL with prototypes of the FAZIA telescopes demostrated the very good performances of the detectors both in terms of identification thresholds and isotopic resolution 2,3 . A test of a complete block (electronic board, Front End Electronic, acquisition system, cooling, mechanical support) is scheduled for next May. The goal of the proposed experiment concerns the measurement of the isotopic composition of fragments with charge ranging from Z=3 up to Z=20, coming from the quasi-projectile decay and/or fission. They will be produced in two reactions with the same beam ( 78 Kr at 35AMeV) and two different targets ( 50 T i and 46 T i) with different N/Z (higher and lower than the isospin of the beam, respectively). The isotopic resolution of the FAZIA blocks will allow us to extend the mass identification to charge regions up to now accessible only by means of spectrometers; as a consequence, it will be possible to study the isospin sharing between fission fragments and its dependence on the target composition, and this can give information on the isospin transport process.