Development of a new device for thermal neutrons detection by using a sandwich of two high-purity $^{10}B$ enriched layers.

Provenzano C., Caricato A.P., Marra M., Finocchiaro P., Amaducci S., Calcagnile L., Martino M., Quarta G.
  Giovedì 15/09   15:00 - 18:30   Aula L - Christa Mc Auliffe   VI - Fisica applicata, acceleratori e beni culturali   Presentazione
We report on the development of a new device for the detection of thermal neutrons by using a sandwich of two $^{10}B$-enriched conversion thin films, grown by PLD, coupled with two silicon detectors. As for the conversion materials, $^{10}B$ is one of the most valid choices, thanks to its high neutron capture cross-section and relatively high $Q$ value. In previous works we have already shown the possibility to grow by PLD high quality, large area $^{10}B$ thin films which coupled with Si detectors showed good performances for thermal neutron detection. In the frame of the INFN BoLAS_NEXT our research efforts have been focused in the development of a new set-up aimed at improving detection efficiency, sensitivity and discrimination against gamma background, produced by neutron capture reaction. This new detection geometry involves the combined use of two conversion layers ({1.5 $\mu m$ thick) and two solid state silicon detectors, with the main goal of enhancing the detection efficiency compared to the single-layer geometry. We present the obtained results with improved efficiency, when our detector is exposed to a neutron flux. Comparison of experimental data with Geant4 simulations is also provided.