Abstract
Spatial resolution of less than 200 mu m is challenging for thermal neutron detection. A novel readout scheme based on the time-projection-chamber (TPC) concept is used in a gaseous electron multiplier (GEM) detector [1]. Thermal neutrons are captured in a single 2 mu m thick Boron-10 converter cathode and secondary Helium and Lithium ions are produced with a combined energy of 2.8 MeV. These ions have sufficient energy to form straight tracks of several mm length. With a time resolving 2-dimensional readout of 400 mu m pitch in both directions, based on APV25 chips, the ions are tracked and their respective origin in the cathode converter foil is reconstructed. Using an Ar-Co-2 93:7% gas mixture, a resolution of 100 mu m (FVVHM 235 mu m) has been observed with a triple GEM-detector setup at the Garching neutron source (FRMII) for neutrons of 4.7 angstrom. (C) 2015 Elsevier B.V. All rights reserved.
Dokumententyp: | Zeitschriftenartikel |
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Fakultät: | Physik |
Themengebiete: | 500 Naturwissenschaften und Mathematik > 530 Physik |
ISSN: | 0168-9002 |
Sprache: | Englisch |
Dokumenten ID: | 47727 |
Datum der Veröffentlichung auf Open Access LMU: | 27. Apr. 2018, 08:13 |
Letzte Änderungen: | 04. Nov. 2020, 13:24 |