Status and performances of the FAZIA project, M.-F. Rivet, Institut de Physique Nucleaire, CNRS/IN2P3, Universit_e Paris-Sud 11, F-91406 Orsay Cedex, France (FAZIA collaboration1) − The aim of the FAZIA project is the definition and construction of a multidetector array designed for detailed studies of the isospin degree of freedom:  it needs to extend as far as possible the elemental and isotopic identification of nuclear collision reaction products while reducing their identification energy thresholds.  The FAZIA module has been defined as a three-member telescope comprising two silicon detectors (300 and 500 μm) followed by a 10 cm CsI(Tl).  A vigorous R&D was particularly conducted for improving the identification capabilities (Z, A) for both the traditional ΔE-E and the newer Pulse Shape techniques.  A careful selection of the silicon and CsI(Tl) material coupled to digital signal processing performed with a specifically developed integrated sampling electronics allow to reach high performances. The ΔE-E correlations, for particles stopped in the second or third member of a telescope, allow isotopic identification up to Z~25 (A~50) [1].  For nuclei stopped in the first silicon, the digital pulse shape analysis makes possible elemental identification up to Z=55-60, and isotopic identification for Z=1-10 [2].  Similar results were obtained with a double side silicon-strip detector. The project now enters the phase of building a demonstrator comprising about 200 modules.

 

[1] S. Carboni et al. (FAZIA Collaboration), Nucl. Inst. Meth. in Phys. Res. A 664, 251 (2012).

[2] L. Bardelli et al. (FAZIA Collaboration), Nucl. Inst. Meth. in Phys. Res. A 654, 272 (2011).

1http://fazia.in2p3.fr/spip/