Volume 123, Number 5, September 2018
|Number of page(s)||6|
|Published online||02 October 2018|
A high-efficiency thermal neutron detector based on thin 3D 10B4C converters for high-rate applications
1 Dipartimento di Fisica, Università degli studi di Milano Bicocca - Piazza della Scienza 3, I-20126 Milano, Italy
2 Istituto di Fisica del Plasma (IFP-CNR) - Via Cozzi 53, I-20125 Milano, Italy
3 IENI-CNR, Consiglio Nazionale delle Ricerche - Milano, Italy
4 Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München - Lichtenbergstr. 1, D-85748 Garching, Germany
5 European Spallation Source ERIC (ESS) - Tunavägen 24, SE-221 00 Lund, Sweden
6 Mid-Sweden University - Sundsvall, Sweden
7 Dept. of Physics, Chemistry and Biology (IFM), Linköping University - SE-581 83 Linköping, Sweden
8 STFC-ISIS Facility, Rutherford Appleton Laboratory - Didcot, UK
9 INFN - Sezione Di Milano-Bicocca - Piazza della Scienza 3, I-20126 Milano, Italy
Received: 25 June 2018
Accepted: 4 September 2018
A new position-sensitive thermal neutron detector based on boron-coated converters has been developed as an alternative to today's standard 3He-based technology for application to thermal neutron scattering. The key element of the development is a novel 3D 10B4C converter which has been ad hoc designed and realized with the aim of combining a high neutron conversion probability via the 10B(n, α)7Li reaction together with an efficient collection of the produced charged particles. The developed 3D converter is composed of thin aluminium grids made by a micro-waterjet technique and coated on both sides with a thin layer of 10B4C. When coupled to a GEM detector this converter allows reaching neutron detection efficiencies close to 50% at neutron wavelengths equal to 4 Å. In addition, the new detector features a spatial resolution of about 5 mm and can sustain counting rates well in excess of . The newly developed neutron detector will enable time-resolved measurements of different kind of samples in neutron scattering experiments at high flux spallation sources and can find a use in applications where large areas and custom geometries of thermal neutron detectors are foreseen.
PACS: 29.40.-n – Radiation detectors / 28.20.Cz – Neutron scattering / 29.40.Cs – Gas-filled counters: ionization chambers, proportional, and avalanche counters
© EPLA, 2018
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