Design study for a 4 ancillary detector for light charged particles to be used together with -ray arrays in fusion-evaporation and direct reactions

Design study for a 4 ancillary detector for light charged particles to be used together with -ray arrays in fusion-evaporation and direct reactions

Physics Case

• Study of the structure of exotic nuclei using secondary radioactive beams (SPES@LNL, SPIRAL2@GANIL)

TRACE

AGATA + reaction chamber

Monte Carlo simulations with GEANT4 for the barrel geometry

Main requirements of our detector for light charged particles

• Detector specifications:

• Efficiency
• Geometry
• Position resolution
• Energy resolution
• Time resolution
• Energy range
• ∆E-E technique & PSA

• Electronics

• ASIC’s
• DSS

Main Requirements

Detector Specifications

• Detector: made of Silicon to minimize the absorption of gamma rays, thin junction window (0.1m).

• Geometries:

• ∆E: Si-pad det. <150 m thick, pad 2x2 mm2, strip 2 mm
• E: Si-pad det. >1.5 mm thick, pad 2x2 mm2, strip 2 mm

• Dimensions: 40 x 80 mm2

• Angular Resolution: 1°, 1-2 mm at 15 cm

• Energy resolution: <50 keV for 5 MeV -particles

• Wide energy range: 200 keV-20 MeV for p, 80 MeV for 

• Time Resolution: 500 ps for A=8 & 2 MeV/u

• Pulse shape analysis: 2 GHz, >10 bits

• Coupling: AC

Coupling with AGATA demonstrator

Coupling with AGATA 2

Lateral faces 8 E-E modules with orthogonal Si-strip

Forward 4 E-E modules with Si-pad

Transparency

Electronics

Electronics

• ASIC read-out chips: to reduce at minimum the very limited space available around the target, the large number of electronic channels associated with the segmented detectors.

• Tests of Si-pad detectors coupled via various boards to different ASIC chips are under way at Legnaro and Camerino.

Results on Si-pad Detectors and Read-out Electronics

Conclusions

SINTEF

MICRON

Summary

• More realistic event generators are needed to make (usefull) simulations.
• The analysis of the experiment is still going on, looking for the actual value of the resolution, achievable in working conditions.
• Still waiting for thicker Si prototype. An in-beam test is going to be planned.

Si-pad detectors for X-rays developed at UNICAM-PG-LNL