Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 85: Spur- und Myondetektoren 2

T 85.5: Talk

Thursday, March 12, 2015, 17:45–18:00, G.10.05 (HS 7)

TPC-like readout of a GEM-Detector with single 10-Boron converter cathode for thermal neutron detection — •Bernhard Flierl¹, Otmar Biebel¹, Ralf Hertenberger¹, and Karl Zeitelhack² — ¹Ludwig-Maximilians-Universität München — ²Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) Technische Universitat München

Micropattern Detectors like GEM (gaseous electron multiplier) or Mi- cromegas (micro mesh gaseous structure) are well suited for precision tracking of charged particles. We develop these detectors for precision detection and tracking of neutral particles like Gammas or Neutrons. A solid ¹⁰B converter has been used to detect thermal neutrons and track the reaction products of the n + ¹⁰B -> ⁷Li + ⁴He + 2.8 MeV in a GEM detector with an active volume of 90·100·6 mm³ and two-dimensional strip readout. By use of a Time Projection Chamber (TPC) like detection mode of the ionization electrons the spatial resolution for the detection of thermal neutrons could be considerably increased. Resolutions well below 0.5 mm (FWHM) were observed in an experiment with 4.7 Ångstrom (3.7 meV) neutrons at FRMII (Forschungs-Neutronenquelle Heinz Maier-Leibnitz).