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).