Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Instrumentierung V
HK 21.2: Vortrag
Dienstag, 22. März 2011, 14:30–14:45, HS2
Scintillator Concept of NeuLAND at R3B — Thomas Aumann3, Konstanze Boretzky2, Michael Heil2, Alexander Ignatov3, •Vassili Maroussov1,2, Haik Simon2, and Andreas Zilges1 — 1Institut für Kernphysik, Universität zu Köln — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3Technische Universität Darmstadt
For the R3B experiment at FAIR a detection system for fast neutrons, NeuLAND (new Large Area Neutron Detector), is foreseen. Besides a time resolution of σt ≅ 100 ps, spatial resolutions of σx,y,z ≅ 1 cm, the detection efficiency of above 90% for neutrons of 0.2-1 GeV and a dedicated multi-neutron recognition capability are demanded. Using the FLUKA Monte Carlo code we studied a NeuLAND detector concept relying entirely on bars of a plastic scintillator (BC408). With a detector depth of 2 m the required efficiency is reached and the fraction of incident neutrons detected within resolution requirements varies from ∼70% to 80% in the desired energy range. Simulations have verified that the introduction of an inactive converter like iron deteriorates the timing performance. Due to the low density of the scintillator secondary protons typically cross several modules, thus allowing the tracking of secondaries. The status of the multi-hit recognition algorithm using the tracking information will be presented along with the latest results for the scintillator prototypes for NeuLAND. Using the same framework a competing concept for NeuLAND based on MRPCs was studied as well and will be contrasted to the scintillator concept.
This work was supported by the BMBF (06 KY 9136)