The experimental set-up of the RIB in-flight facility EXOTIC

Abstract

We describe the experimental set-up of the Radioactive Ion Beam (RIB) in-flight facility EXOTIC consisting of: a) two position-sensitive Parallel Plate Avalanche Counters (PPACs), dedicated to the event-by-event tracking of the produced RIBs and to time of flight measurements; b) the new high-granularity compact telescope array EXPADES (EXotic PArticle DEtection System), designed for nuclear physics and nuclear astrophysics experiments employing low-energy light RIBs. EXPADES consists of eight ∆E-E res telescopes arranged in a cylindrical configuration around the target. Each telescope is made up of two Double Sided Silicon Strip Detectors (DSSSDs) with a thickness of 40/60 µm and 300 µm for the ∆E and E res layer, respectively. Additionally, eight ionization chambers were constructed to be used as an alternative ∆E stage or, in conjunction with the entire DSSSD array, to build up more complex triple telescopes. New low-noise multi-channel chargesensitive preamplifiers and spectroscopy amplifiers, associated with constant frac-

Elastic scattering of Be7+Si28 at near-barrier energies

“…The 7 Be beam was produced at four energies: 13.2, 17.2, 19.8, and 22 MeV, the highest three being obtained by retuning the primary beam while the lowest was obtained using a degrader. The beam passed through two x-y sensitive parallel-plate avalanche counters (PPACs) located along the beam line 909 mm (PPAC A ) and 365 mm (PPAC B ) [45] upstream of the secondary target then impinged with a flux of ∼5 × 10 4 pps on a 0.4-mg/cm 2 -thick 28 Si target (0.6 mg/cm 2 for the 17.2 MeV data). Both the elastically scattered 7 Be nuclei and the reaction products were recorded in EXPADES [45,46], the detector array of the EXOTIC facility.…”

Reaction dynamics studies for the system 7Be + 208Pb at Coulomb barrier energies

“…• ] by means of six modules of the EXPADES detector array [29,30]. This was actually the first experiment (after the commissioning runs) performed with this setup, whose electronics was entirely developed by our collaboration.…”

O17+Ni58scattering and reaction dynamics around the Coulomb barrier

“…1) followed by a 100 μm thick surface barrier detector (labeled E in Fig. 1) placed at θ E = 108.2 • and a distance of 125.3 mm from the target was employed for testing the EXPADES [23,24] detector array components. The IC/E res telescope was commissioned in this run.…”

“…Further details may be found in Refs. [23,24]. Figure 2 shows the energy spectra collected by the back side (vertical strips) of detector A at a beam energy of E lab = FIG.…”

“…(9) A target nonuniformity of 15% FWHM [28] as found from the study of the 17 O + 208 Pb elastic scattering and the electronic noise of the system (see details in Ref. [24]).…”