J. Torrent
A5035237004- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Muon and positron interactions and applications
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Radiation Therapy and Dosimetry
- Photocathodes and Microchannel Plates
- Cold Atom Physics and Bose-Einstein Condensates
- Particle accelerators and beam dynamics
- Analytical chemistry methods development
- Seismic and Structural Analysis of Tall Buildings
- Structural Health Monitoring Techniques
- Gyrotron and Vacuum Electronics Research
- Radioactivity and Radon Measurements
- Seismic Performance and Analysis
- Physics of Superconductivity and Magnetism
- Analytical Chemistry and Sensors
- Scientific Research and Discoveries
- Electrochemical Analysis and Applications
Donostia International Physics Center
2018-2024
University of Girona
2012-2024
Basque Centre for Climate Change
2023-2024
Universitat de Lleida
2023
Pacific Northwest National Laboratory
2022
The University of Texas at Austin
2020
Israel Atomic Energy Commission
2020
Soreq Nuclear Research Center
2020
Instituto de Física Corpuscular
2013-2018
University of Coimbra
2017-2018
NEXT-100 is an electroluminescent high-pressure xenon gas time projection chamber that will search for the neutrinoless double beta (0νββ) decay of 136Xe. The detector possesses two features great value 0νββ searches: energy resolution better than 1% FWHM at Q 136Xe and track reconstruction discrimination signal background events. This combination results in excellent sensitivity, as discussed this paper. Material-screening measurements a detailed Monte Carlo simulation predict rate most 4 ×...
In this Technical Design Report (TDR) we describe the NEXT-100 detector that will search for neutrinoless double beta decay (ββ0ν) in 136XE at Laboratorio Subterráneo de Canfranc (LSC), Spain. The document formalizes design presented our Conceptual (CDR): an electroluminescence time projection chamber, with separate readout planes calorimetry and tracking, located, respectively, behind cathode anode. is designed to hold a maximum of about 150 kg xenon 15 bar, or 100 10 bar. This option...
A new method to tag the barium daughter in double-beta decay of ^{136}Xe is reported. Using technique single molecule fluorescent imaging (SMFI), individual dication (Ba^{++}) resolution at a transparent scanning surface demonstrated. single-step photobleach confirms ion interpretation. Individual ions are localized with superresolution (∼2 nm), and detected statistical significance 12.9σ over backgrounds. This lays foundation for potentially background-free neutrinoless technology, based on...
NEXT is an experiment dedicated to neutrinoless double beta decay searches in xenon. The detector a TPC, holding 100 kg of high-pressure xenon enriched the 136 Xe isotope. It under construction Laboratorio Subterráneo de Canfranc Spain, and it will begin operations 2015. concept provides energy resolutionbetter than 1% FWHM topological signal that can be used reduce background. Furthermore, technology extrapolated 1 ton-scale experiment.
The NEXT experiment aims to observe the neutrinoless double beta decay of 136Xe in a high-pressure xenon gas TPC using electroluminescence (EL) amplify signal from ionization. One main advantages this technology is possibility reconstruct topology events with energies close Q ββ . This paper presents first demonstration that provides extra handles reject background data obtained NEXT-DEMO prototype. Single electrons resulting interactions 22Na 1275 keV gammas and electronpositron pairs...
A bstract The Neutrino Experiment with a Xenon TPC (NEXT) searches for the neutrinoless double-beta (0 νββ ) decay of 136 Xe using high-pressure xenon gas TPCs electroluminescent amplification. scaled-up version this technology about 1 tonne enriched could reach in less than 5 years operation sensitivity to half-life 0 better 10 27 years, improving current limits by at least one order magnitude. This prediction is based on well-understood background model dominated radiogenic sources....
We investigate the potential of using deep learning techniques to reject background events in searches for neutrinoless double beta decay with high pressure xenon time projection chambers capable detailed track reconstruction. The differences topological signatures and signal can be learned by neural networks via training over many thousands events. These then used classify further as or background, providing an additional rejection factor at acceptable loss efficiency. trained this study...
Conceived to host 5 kg of xenon at a pressure 15 bar in the fiducial volume, NEXT- White (NEW) apparatus is currently largest high gas TPC using electroluminescent amplification world. It also 1:2 scale model NEXT-100 detector scheduled start searching for $\beta\beta 0\nu$ decays 136Xe 2019. Both detectors measure energy event plane photomultipliers located behind transparent cathode. They can reconstruct trajectories charged tracks dense with help silicon anode. A sophisticated system,...
NEXT-DEMO is a high-pressure xenon gas TPC which acts as technological test-bed and demonstrator for the NEXT-100 neutrinoless double beta decay experiment. In its current configuration apparatus fully implements design concept. This an asymmetric TPC, with energy plane made of photomultipliers tracking silicon (SiPM) coated TPB. The detector in this new has been used to reconstruct characteristic signature electrons dense gas, demonstrating ability identify MIP ``blob'' regions. Moreover,...
NEXT-DEMO is a large-scale prototype of the NEXT-100 detector, an electroluminescent time projection chamber that will search for neutrinoless double beta decay \XE using 100–150 kg enriched xenon gas. was built to prove expected performance NEXT-100, namely, energy resolution better than 1% FWHM at 2.5 MeV and event topological reconstruction. In this paper we describe its initial results. A 1.75% 511 keV (which extrapolates 0.8% MeV) obtained 10 bar pressure gamma-ray calibration source....
The Neutrino Experiment with a Xenon TPC (NEXT) is intended to investigate the neutrinoless double beta decay of 136Xe, which requires severe suppression potential backgrounds. An extensive screening and material selection process underway for NEXT since control radiopurity levels materials be used in experimental set-up must rare event searches. First measurements based on Glow Discharge Mass Spectrometry gamma-ray spectroscopy using ultra-low background germanium detectors at Laboratorio...
We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for detection X-rays (30 keV) and γ-rays (0.511–1.275 MeV) in conjunction with accurate tracking associated electrons. When operated at such high pressure ~1%-admixtures, trimethylamine (TMA) endows Xenon an extremely low electron diffusion (1.3±0.13mm-σ (longitudinal), 0.95±0.20mm-σ (transverse) along 1 m drift) besides forming convenient 'Penning-Fluorescent' mixture. The TPC, that houses 1.1 kg gas...
The NEXT-White (NEW) detector is currently the largest radio-pure high-pressure xenon gas time projection chamber with electroluminescent readout in world. It has been operating at Laboratorio Subterr'aneo de Canfranc (LSC) since October 2016. This paper describes calibrations performed using 83mKr decays during a long run taken from March to November 2017 (Run II). Krypton are used correct for finite drift-electron lifetime as well dependence of measured energy on event transverse position...
The Neutrino Experiment with a Xenon Time-Projection Chamber (NEXT) is intended to investigate the neutrinoless double beta decay of 136Xe, which requires severe suppression potential backgrounds; therefore, an extensive screening and selection process underway control radiopurity levels materials be used in experimental set-up NEXT. detector design combines measurement topological signature event for background discrimination energy resolution optimization. Separate tracking readout planes...
A bstract Excellent energy resolution is one of the primary advantages electroluminescent high-pressure xenon TPCs. These detectors are promising tools in searching for rare physics events, such as neutrinoless double-beta decay ( ββ 0 ν ), which require precise measurements. Using NEXT-White detector, developed by NEXT (Neutrino Experiment with a Xenon TPC) collaboration, we show first time that an 1% FWHM can be achieved at 2.6 MeV, establishing present technology best all searches.
We present evidence of non-excimer-based secondary scintillation in gaseous xenon, obtained using both the NEXT-White TPC and a dedicated setup. Detailed comparison with first-principle calculations allows us to assign this mechanism neutral bremsstrahlung (NBrS), process that has been postulated exist xenon largely overlooked. For photon emission below 1000 nm, NBrS yield increases from about 10$^{-2}$ photon/e$^{-}$ cm$^{-1}$ bar$^{-1}$ at pressure-reduced electric field values 50 V above...
The Laboratorio Subterráneo de Canfranc (LSC) is the Spanish national hub for low radioactivity techniques and associated scientific technological applications. concentration of airborne radon a major component radioactive budget in neighborhood detectors. LSC hosts Radon Abatement System, which delivers suppressed air with 1.1±0.2 mBq/m3 222Rn. content continuously monitored an Electrostatic Monitor. Measurements double beta decay demonstrators NEXT-NEW CROSS gamma HPGe detectors show...
NEXT-MM is a general-purpose high pressure (10 bar, $\sim25$ l active volume) Xenon-based TPC, read out in charge mode with an 8 cm $\times$8 cm-segmented 700 cm$^2$ plane (1152 ch) of the latest microbulk-Micromegas technology. It has been recently commissioned at University Zaragoza as part R&D NEXT $0\nu\beta\beta$ experiment, although experiment's first stage currently being built based on SiPM/PMT-readout concept relying electroluminescence. Around 2 million events were collected during...
High-pressure xenon gas is an attractive detection medium for a variety of applications in fundamental and applied physics. In this paper we study the ionization scintillation properties at 10 bar pressure. For purpose, use source alpha particles NEXT-DEMO time projection chamber, large scale prototype NEXT-100 neutrinoless double beta decay experiment, three different drift electric field configurations. We measure electron velocity longitudinal diffusion, compare our results to...
The NEXT experiment aims to observe the neutrinoless double beta decay of $^{136}$Xe in a high pressure gas TPC using electroluminescence (EL) amplify signal from ionization. Understanding response detector is imperative achieving consistent and well understood energy measurement. abundance xenon k-shell x-ray emission during data taking has been identified as multitool for characterisation fundamental parameters equalisation detector. NEXT-DEMO prototype ~1.5 kg volume filled with natural...
Xe–CO2 mixtures are important alternatives to pure xenon in Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification with applications the field of rare event detection such as directional dark matter, double electron capture and beta decay detection. The addition CO2 at level 0.05–0.1% can reduce significantly scale diffusion from 10 mm/m 2.5 mm/m, high impact discrimination efficiency events through pattern recognition topology primary...
A bstract The measurement of the internal 222 Rn activity in NEXT-White detector during so-called Run-II period with 136 Xe-depleted xenon is discussed detail, together its implications for double beta decay searches NEXT. measured through alpha production rate induced fiducial volume by and alpha-emitting progeny. specific to be (38.1 ± 2.2 (stat.) 5.9 (syst.)) mBq/m 3 . Radon-induced electrons have also been characterized from 214 Bi daughter ions plating out on cathode time projection...