English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A new technique for detection of slow neutrons with gaseous detectors usingultra-thin layers with 10B atoms is presented. The reaction between a thermalneutron and a 10B atom releases 2 secondary particles, namely a 7Li ion and analpha particle, which due to momentum conservation are emitted in oppositedirections, along the same line (back to back). Current boron coated neutrondetectors are equipped with 10B films with thicknesses of several micrometers,deposited on very thick substrate plates. However, since the ranges of the 7Liion and the alpha particle are of few micrometeres in most materials, one ofthese particles is always lost in the 10B layer or substrate. As such, thesedetectors lose the ability to reconstruct the reaction line of action and toprecisely determine the neutron position, as only one of the two secondaryparticles track can be measured. With the technique now presented, the sum ofthe 10B layer and the substrate thicknesses is small enough to allow for bothsecondary particles to escape and ionize the gas in opposite sides of the 10Bconverter foil. Independent readout structures, one on each side of the 10Bconverter foil, detect each secondary particle and determine its track centroidand the deposited energy. Since the two secondary particles are emitted back toback, the neutron position can be obtained by combining the informationrecorded by the two readout structures. Through GEANT4 simulations, we verifiedthat the spatial resolution can be significantly improved: our results showthat, by using a B4C layer with a thickness of 1 micron on a 0.9 micron Mylarsubstrate, the spatial resolution can by improved by a factor of 8, compared toconventional detectors with thick 10B detection layers.

Improving position resolution of neutron detectors with ultra-thin B4C foils