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We present the results of the measurements of the detection efficiency for a4.7 \r{A} neutron beam incident upon a detector incorporating a stack of up tofive MultiWire Proportional Counters (MWPC) with Boron-coated cathodes. Thecathodes were made of Aluminum and had a surface exhibiting millimeter-deepV-shaped grooves of 45{\deg}, upon which the thin Boron film was deposited byDC magnetron sputtering. The incident neutrons interacting with the converterlayer deposited on the sidewalls of the grooves have a higher captureprobability, owing to the larger effective absorption film thickness. Thisleads to a higher overall detection efficiency for the grooved cathode whencompared to a cathode with a flat surface. Both the experimental results andthe predictions of the GEANT4 model suggests that a 5-counter detector stackwith coated grooved cathodes has the same efficiency as a 7-counter stack withflat cathodes. The reduction in the number of counters in the stack withoutaltering the detection efficiency will prove highly beneficial for large-areaposition-sensitive detectors for neutron scattering applications, for which thecost-effective manufacturing of the detector and associated readout electronicsis an important objective. The proposed detector concept could be atechnological option for one of the new chopper spectrometers and otherinstruments planned to be built at the future European Spallation Source inSweden. These results with macrostructured cathodes generally apply not just toMWPCs but to other gaseous detectors as well.

A 10B-based neutron detector with stacked Multiwire Proportional Counters and macrostructured cathodes