The SiRi particle-telescope system

A silicon particle-telescope system for light-ion nuclear reactions is described. In particular, the system is optimized for level density and γ‐ray strength function measurements with the so-called Oslo method. Eight trapezoidal modules are mounted at 5cm distance from the target, covering eight fo...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2011-08, Vol.648 (1), p.168-173
Main Authors: Guttormsen, M., Bürger, A., Hansen, T.E., Lietaer, N.
Format: Article
Language:English
Subjects:
Coincidences
Density
Depletion
Detectors
Ejection
Electric potential
Guards
Particle telescope
Silicon detectors
Spectrometers
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Summary:A silicon particle-telescope system for light-ion nuclear reactions is described. In particular, the system is optimized for level density and γ‐ray strength function measurements with the so-called Oslo method. Eight trapezoidal modules are mounted at 5cm distance from the target, covering eight forward angles between θ=40∘ and 54°. The thin front ΔE detectors (130μm) are segmented into eight pads, determining the reaction angle θ for the outgoing charged ejectile. Guard rings on the thick back E detectors (1550μm) guarantee low leakage current at high depletion voltage. ► We have designed silicon chips with guard rings with small leakage current. ► These form a particle-telescope system with 64 ΔE−E detectors. ► The system covers eight forward angels between 40° and 54°. ► Together with NaI detectors we obtain high γ–particle coincidence efficiency.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2011.05.055