14-17 September 2021
America/Los_Angeles timezone

Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution

16 Sep 2021, 13:45
Signal reconstruction and identification (analysis methods, simulations) Signal Reconstruction (3C)


Dr Ander Simón Estévez (Ben-Gurion University of the Negev)


The NEXT collaboration aims to observe neutrinoless double beta decay in gaseous 136Xe using a high pressure gaseous Xe time projection chamber with signal amplification by means of electroluminescence (EL). One of the advantages of the technique is that it allows for track reconstruction making use of a sensor plane equipped with SiPMs located nearby the EL region. However, the signals recorded in the TPC are degraded by electron diffusion and spread of light produced in the EL process, limiting the potential of the detection scheme.

We have recently developed an improved reconstruction procedure based on the Richardson-Lucy deconvolution, an iterative algorithm well-known in image processing and de-blurring. Deconvolution allows reversing the smearing mechanisms in the NEXT TPC and significantly enhances the definition of reconstructed tracks. Consequently, detector performance is strongly boosted, with a five-fold improvement in background rejection demonstrated on experimental data.

In the talk we will detail the algorithm application in the context of the NEXT experiment with a focus on the performance in NEXT-White, a 50 cm TPC currently operating underground at Laboratorio Subterráneo de Canfranc. We will describe the procedure applied to characterize the optical response of the chamber by obtaining the point spread function that best describes the observed signals. We will also discuss the potential of the algorithm to ease the tracking hardware requirements of future detector iterations.

Primary authors

Dr Ander Simón Estévez (Ben-Gurion University of the Negev) Dr Lior Arazi (Ben-Gurion University of the Negev) Mr Yair Ifergan

Presentation Materials