Josè Juan Gomez Cadenas
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Josè Juan Gomez Cadenas has a total of 1000 co-authors. Here are the top co-authors by number of shared publications:
- Michel Sorel
CSIC & Universitat de València
89 shared publications - Justo Martin-Albo
CSIC & Universitat de València
75 shared publications - Francesco Monrabal
Donostia International Physics Center
67 shared publications A. Grant
65 shared publicationsL. Tortora
63 shared publications- Agnieszka Zalewska
H. Niewodniczanski Institute of Nuclear Physics PAN, Cracow, Poland
62 shared publications
Latest Publications
- Open Access
- 17 September 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (9) , 1066
Publisher Correction: Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos
- 17 September 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (9) , 1066
Open AccessPublisher Correction: Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos
- Open Access
- 10 September 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (9) , 1057
Demonstration of sub-percent energy resolution in the NEXT-100 detector
NEXT-100 is a high-pressure xenon time projection chamber with electroluminescent amplification, designed to operate with up to $$\sim $$ 70.5 kg at 13.5 bar. It is the most recent detector developed by the NEXT collaboration to search for the neutrinoless double-beta decay ( $$\beta \beta 0\nu $$ ) of $$ ^{136}\mathrm Xe$$ . The NEXT gas TPC technology offers the best energy resolution near the Q-value of the decay ( $$Q_{\beta \beta }$$ = 2458 keV) among xenon detectors, which is set by design to be <1% FWHM. We report here the high-energy calibration of the detector using a $$ ^{228}\textrm{Th}$$ source, demonstrating excellent linear response and an energy resolution of $$(0.90 \pm 0.02)\%$$ FWHM at the $$^{208}$$ Tl photopeak (2615 keV). This performance extrapolates to a resolution at the double-beta decay end-point of $$R(Q_{\beta \beta }) = (0.93 \pm 0.02)\%$$ FWHM, confirming the detector’s capability for precision energy measurement in the search for $$\beta \beta 0\nu $$ .- 10 September 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (9) , 1057
Open AccessDemonstration of sub-percent energy resolution in the NEXT-100 detector
NEXT-100 is a high-pressure xenon time projection chamber with electroluminescent amplification, designed to operate with up to $$\sim $$ 70.5 kg at 13.5 bar. It is the most recent detector developed by the NEXT collaboration to search for the neutrinoless double-beta decay ( $$\beta \beta 0\nu $$ ) of $$ ^{136}\mathrm Xe$$ . The NEXT gas TPC technology offers the best energy resolution near the Q-value of the decay ( $$Q_{\beta \beta }$$ = 2458 keV) among xenon detectors, which is set by design to be <1% FWHM. We report here the high-energy calibration of the detector using a $$ ^{228}\textrm{Th}$$ source, demonstrating excellent linear response and an energy resolution of $$(0.90 \pm 0.02)\%$$ FWHM at the $$^{208}$$ Tl photopeak (2615 keV). This performance extrapolates to a resolution at the double-beta decay end-point of $$R(Q_{\beta \beta }) = (0.93 \pm 0.02)\%$$ FWHM, confirming the detector’s capability for precision energy measurement in the search for $$\beta \beta 0\nu $$ . - Open Access
- 7 September 2026
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2026 (9) , 82
Radon-induced backgrounds in the NEXT-100 experiment
A bstract: The NEXT-100 detector at the LSC aims at the first competitive search for the 0 νββ decay using a high-pressure 136 Xe electroluminescent time projection chamber. The first low-background run of NEXT-100 at 3.95 bar has been devoted to the measurement of the radon-induced backgrounds impacting this search. The contributions from both the internal and external airborne radon have been evaluated. The internal 222 Rn activity is found to be (0.95 ± 0.04(stat) ± 0.09(sys)) Bq/m 3 , while no traces of 220 Rn have been observed. Most of the 222 Rn progeny plate-out on the surface of the cathode of the detector, leading to a rate of Rn-induced 214 Bi of (0.97 ± 0.05(stat) ± 0.10(sys)) Hz for visible energies above 400 keV. The corresponding background index in the 0 νββ region of interest is evaluated as (7.3 ± 1.5(stat) ± 0.8(sys)) × 10 − 4 counts/(keV · kg · yr) after selection of the fully contained events. This background index is reduced to ∼ 4 × 10 − 5 counts/(keV · kg · yr) by applying a topological selection requiring only one double-electron-like track in the events. This value is one order of magnitude below the total radiogenic background expectation in NEXT-100. By analyzing the correlation of the airborne radon activity and the measured rate of events in NEXT-100, it is concluded that the detector operates in a virtually radon-free environment thanks to the radon abatement system of the LSC.
- 7 September 2026
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2026 (9) , 82
Open AccessRadon-induced backgrounds in the NEXT-100 experiment
A bstract: The NEXT-100 detector at the LSC aims at the first competitive search for the 0 νββ decay using a high-pressure 136 Xe electroluminescent time projection chamber. The first low-background run of NEXT-100 at 3.95 bar has been devoted to the measurement of the radon-induced backgrounds impacting this search. The contributions from both the internal and external airborne radon have been evaluated. The internal 222 Rn activity is found to be (0.95 ± 0.04(stat) ± 0.09(sys)) Bq/m 3 , while no traces of 220 Rn have been observed. Most of the 222 Rn progeny plate-out on the surface of the cathode of the detector, leading to a rate of Rn-induced 214 Bi of (0.97 ± 0.05(stat) ± 0.10(sys)) Hz for visible energies above 400 keV. The corresponding background index in the 0 νββ region of interest is evaluated as (7.3 ± 1.5(stat) ± 0.8(sys)) × 10 − 4 counts/(keV · kg · yr) after selection of the fully contained events. This background index is reduced to ∼ 4 × 10 − 5 counts/(keV · kg · yr) by applying a topological selection requiring only one double-electron-like track in the events. This value is one order of magnitude below the total radiogenic background expectation in NEXT-100. By analyzing the correlation of the airborne radon activity and the measured rate of events in NEXT-100, it is concluded that the detector operates in a virtually radon-free environment thanks to the radon abatement system of the LSC.
- Open Access
- 1 July 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (7)
First results of the NEXT-100 detector using 83mKr decays
The NEXT collaboration is investigating the double beta decay of $$ ^{136}\mathrm Xe$$ using high-pressure gas electroluminescent time projection chambers, which provide excellent energy resolution together with a robust topological signature. Operating at the Laboratorio Subterráneo de Canfranc (LSC) and building on the success of the NEXT-White detector, the NEXT-100 apparatus began commissioning in May 2024 and started operation with xenon at a pressure of 4 bar in October 2024. We report here the first results obtained with NEXT-100 using low-energy calibration data from $$^{83\text {m}}\textrm{Kr}$$ decays, which allow mapping of the detector response in the active volume and monitoring of its stability over time. After homogenizing the light response, we achieve an energy resolution of 4.37% FWHM at 41.5 keV for $$^{83\text {m}}\textrm{Kr}$$ point-like energy deposits contained in a radius of 425 mm. In a fiducial region representing the operating conditions of NEXT-100 at 10 bar we obtain an improved energy resolution of 4.16% FWHM. These results are in good agreement with that obtained in NEXT-White, and an $$E^{-1/2}$$ extrapolation to $$Q_{\beta \beta }$$ yields an energy resolution close to 0.5% FWHM, well below the 1% FWHM design target.- 1 July 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (7)
Open AccessFirst results of the NEXT-100 detector using 83mKr decays
The NEXT collaboration is investigating the double beta decay of $$ ^{136}\mathrm Xe$$ using high-pressure gas electroluminescent time projection chambers, which provide excellent energy resolution together with a robust topological signature. Operating at the Laboratorio Subterráneo de Canfranc (LSC) and building on the success of the NEXT-White detector, the NEXT-100 apparatus began commissioning in May 2024 and started operation with xenon at a pressure of 4 bar in October 2024. We report here the first results obtained with NEXT-100 using low-energy calibration data from $$^{83\text {m}}\textrm{Kr}$$ decays, which allow mapping of the detector response in the active volume and monitoring of its stability over time. After homogenizing the light response, we achieve an energy resolution of 4.37% FWHM at 41.5 keV for $$^{83\text {m}}\textrm{Kr}$$ point-like energy deposits contained in a radius of 425 mm. In a fiducial region representing the operating conditions of NEXT-100 at 10 bar we obtain an improved energy resolution of 4.16% FWHM. These results are in good agreement with that obtained in NEXT-White, and an $$E^{-1/2}$$ extrapolation to $$Q_{\beta \beta }$$ yields an energy resolution close to 0.5% FWHM, well below the 1% FWHM design target. - Open Access
- 11 May 2026
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2026 (5) , 106
Coherent elastic neutrino-nucleus scattering at the Japan Proton Accelerator Research Complex
A bstract: The Japan Proton Accelerator Research Complex (J-PARC) currently delivers a 1 MW, 3 GeV proton beam to the Materials and Life Science Experimental Facility (MLF). Power is expected to increase to 1.3 MW, driven by the needs of Hyper-Kamiokande. As a result, the MLF presently provides the highest neutron yield of any spallation source, while potentially holding the best current and foreseeable conditions for Coherent Elastic Neutrino-Nucleus Scattering (CE ν NS) experimentation. We explore this potential, using as examples detector technologies presently funded for construction and under development. We quantify their sensitivity to a rich variety of particle physics scenarios, finding that very-high-statistics CE ν NS measurements with significant sensitivity to relevant scenarios are feasible at this facility within the next few years.
- 11 May 2026
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2026 (5) , 106
Open AccessCoherent elastic neutrino-nucleus scattering at the Japan Proton Accelerator Research Complex
A bstract: The Japan Proton Accelerator Research Complex (J-PARC) currently delivers a 1 MW, 3 GeV proton beam to the Materials and Life Science Experimental Facility (MLF). Power is expected to increase to 1.3 MW, driven by the needs of Hyper-Kamiokande. As a result, the MLF presently provides the highest neutron yield of any spallation source, while potentially holding the best current and foreseeable conditions for Coherent Elastic Neutrino-Nucleus Scattering (CE ν NS) experimentation. We explore this potential, using as examples detector technologies presently funded for construction and under development. We quantify their sensitivity to a rich variety of particle physics scenarios, finding that very-high-statistics CE ν NS measurements with significant sensitivity to relevant scenarios are feasible at this facility within the next few years.
- Open Access
- 11 May 2026
- Published by American Physical Society (APS) in Physical Review Research
- Vol. 8 (2)
Measurement of the scintillation resolution in liquid xenon and its impact for future segmented calorimeters
We report on a measurement of the energy resolution that can be attained in liquid xenon when recording only the scintillation light. Our setup is optimized to maximize light collection and uses state-of-the-art, high-PDE (photodetection efficiency), VUV-sensitive silicon photomultipliers. We find a value of 3.7 % ± 0.4 % at 511 keV, once saturation effects are corrected for, a result close to the Poissonian resolution that we expect in our setup ( 2.8 % ± 0.4 % at 511 keV). Our results in the intrinsic resolution ( 2.3 % ± 0.8 % ) are compatible, within errors, at 511 keV, with those found by theoretical estimations that have been standing for the last 20 years, 1.8 % . Our work opens possibilities for apparatus based on liquid xenon and using scintillation only. In particular, it suggests that modular scintillation detectors using liquid xenon can be very competitive as building blocks in segmented calorimeters, with applications to Positron Emission Tomography technology.
- 11 May 2026
- Published by American Physical Society (APS) in Physical Review Research
- Vol. 8 (2)
Open AccessMeasurement of the scintillation resolution in liquid xenon and its impact for future segmented calorimeters
We report on a measurement of the energy resolution that can be attained in liquid xenon when recording only the scintillation light. Our setup is optimized to maximize light collection and uses state-of-the-art, high-PDE (photodetection efficiency), VUV-sensitive silicon photomultipliers. We find a value of 3.7 % ± 0.4 % at 511 keV, once saturation effects are corrected for, a result close to the Poissonian resolution that we expect in our setup ( 2.8 % ± 0.4 % at 511 keV). Our results in the intrinsic resolution ( 2.3 % ± 0.8 % ) are compatible, within errors, at 511 keV, with those found by theoretical estimations that have been standing for the last 20 years, 1.8 % . Our work opens possibilities for apparatus based on liquid xenon and using scintillation only. In particular, it suggests that modular scintillation detectors using liquid xenon can be very competitive as building blocks in segmented calorimeters, with applications to Positron Emission Tomography technology.
- Open Access
- 31 March 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (3)
A journey to ITACA
A unique feature of gas xenon electroluminescent time projection chambers (GXeEL TPCs) in $$\beta \beta 0\nu $$ searches is their ability to reconstruct event topology, in particular to distinguish “single-electron” from “double-electron” tracks, the latter being the signature of a $$\beta \beta 0\nu $$ decay near the decay endpoint $$Q_{\beta \beta }$$ . Together with excellent energy resolution and the t $$_0$$ provided by primary scintillation, this topological information is key to suppressing backgrounds. Preserving EL, however, requires operation in pure xenon (with helium as the only benign additive), where electron diffusion is large. Consequently, reconstructed track fidelity is limited by diffusion and intrinsic EL blurring. We propose augmenting the detector with the ability to image not only the electron track but also the corresponding mirror ion track. Introducing trace amounts of $$\mathrm{NH_3}$$ ( $$\sim $$ 100 ppb) converts primary xenon ions into ammonium ions, $$\mathrm{NH_4^{+}}$$ , via a fast two-step ion–molecule process involving charge transfer followed by proton transfer, while leaving EL unaffected. Electrons drift rapidly to the anode, producing the standard EL image, whereas $$\mathrm{NH_4^{+}}$$ ions drift slowly toward the cathode, allowing time to determine the event energy and barycenter. For events in the region of interest, an ion sensor near the cathode at the projected barycenter captures the ions. Laser interrogation of the sensor’s molecular layer then reveals an ion-track image with sub-millimeter diffusion and no EL-induced smearing. Combined electron–ion imaging strengthens topological discrimination, improving background rejection by about an order of magnitude and significantly extending the discovery potential of GXeEL TPCs for very long $$\beta \beta 0\nu $$ lifetimes.- 31 March 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (3)
Open AccessA journey to ITACA
A unique feature of gas xenon electroluminescent time projection chambers (GXeEL TPCs) in $$\beta \beta 0\nu $$ searches is their ability to reconstruct event topology, in particular to distinguish “single-electron” from “double-electron” tracks, the latter being the signature of a $$\beta \beta 0\nu $$ decay near the decay endpoint $$Q_{\beta \beta }$$ . Together with excellent energy resolution and the t $$_0$$ provided by primary scintillation, this topological information is key to suppressing backgrounds. Preserving EL, however, requires operation in pure xenon (with helium as the only benign additive), where electron diffusion is large. Consequently, reconstructed track fidelity is limited by diffusion and intrinsic EL blurring. We propose augmenting the detector with the ability to image not only the electron track but also the corresponding mirror ion track. Introducing trace amounts of $$\mathrm{NH_3}$$ ( $$\sim $$ 100 ppb) converts primary xenon ions into ammonium ions, $$\mathrm{NH_4^{+}}$$ , via a fast two-step ion–molecule process involving charge transfer followed by proton transfer, while leaving EL unaffected. Electrons drift rapidly to the anode, producing the standard EL image, whereas $$\mathrm{NH_4^{+}}$$ ions drift slowly toward the cathode, allowing time to determine the event energy and barycenter. For events in the region of interest, an ion sensor near the cathode at the projected barycenter captures the ions. Laser interrogation of the sensor’s molecular layer then reveals an ion-track image with sub-millimeter diffusion and no EL-induced smearing. Combined electron–ion imaging strengthens topological discrimination, improving background rejection by about an order of magnitude and significantly extending the discovery potential of GXeEL TPCs for very long $$\beta \beta 0\nu $$ lifetimes. - Top Cited PapersOpen Access
- 23 February 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (2) , 170
Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos
This paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25–100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at $$5\sigma $$ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at $$5\sigma $$ C.L. is possible for more than 60% of the actual values of the CP-violating phase, $$\delta _{CP}.$$ Moreover, we will measure $$\delta _{CP}$$ with a precision ranging from 20 $$^{\circ },$$ in the case of maximal CP violation, to 6 $$^{\circ },$$ in the case of CP conservation. We aim to achieve a 0.5% resolution on the $$\Delta m^2_{32}$$ parameter, and a resolution between 3% and 0.5% on the $$\sin ^2\theta _{23}$$ parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector.- 23 February 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (2) , 170
Top Cited PapersOpen AccessSensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos
This paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25–100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at $$5\sigma $$ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at $$5\sigma $$ C.L. is possible for more than 60% of the actual values of the CP-violating phase, $$\delta _{CP}.$$ Moreover, we will measure $$\delta _{CP}$$ with a precision ranging from 20 $$^{\circ },$$ in the case of maximal CP violation, to 6 $$^{\circ },$$ in the case of CP conservation. We aim to achieve a 0.5% resolution on the $$\Delta m^2_{32}$$ parameter, and a resolution between 3% and 0.5% on the $$\sin ^2\theta _{23}$$ parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector. - Top Cited PapersOpen Access
- 5 February 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (2) , 114
The NEXT-100 Detector
The NEXT collaboration is dedicated to the study of double beta decays of $$^{136}$$ Xe using a high-pressure gas electroluminescent time projection chamber. This advanced technology combines exceptional energy resolution ( $$\le 1\%$$ FWHM at the $$Q_{\beta \beta }$$ value of the neutrinoless double beta decay) and powerful topological event discrimination. Building on the achievements of the NEXT-White detector, the NEXT-100 detector started taking data at the Laboratorio Subterráneo de Canfranc (LSC) in May of 2024. Designed to operate with xenon gas at 13.5 bar, NEXT-100 consists of a time projection chamber where the energy and the spatial pattern of the ionising particles in the detector are precisely retrieved using two sensor planes (one with photo-multiplier tubes and the other with silicon photo-multipliers). The detector has been operating at stable conditions using argon and xenon gases at $$\sim $$ 4 bar and drift fields of $$74\hbox { V cm}^{-1}$$ and $$118\hbox { V cm}^{-1}$$ , respectively. Alpha decays from the $$^{222}$$ Rn chain have been used to test and monitor the stability of the detector, showing a constant electron lifetime in the drift volume. In this paper, in addition to reporting the results of the commissioning run, we provide a detailed description of the NEXT-100 detector, describe its assembly, and present the current estimation of the radiopurity budget.- 5 February 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (2) , 114
Top Cited PapersOpen AccessThe NEXT-100 Detector
The NEXT collaboration is dedicated to the study of double beta decays of $$^{136}$$ Xe using a high-pressure gas electroluminescent time projection chamber. This advanced technology combines exceptional energy resolution ( $$\le 1\%$$ FWHM at the $$Q_{\beta \beta }$$ value of the neutrinoless double beta decay) and powerful topological event discrimination. Building on the achievements of the NEXT-White detector, the NEXT-100 detector started taking data at the Laboratorio Subterráneo de Canfranc (LSC) in May of 2024. Designed to operate with xenon gas at 13.5 bar, NEXT-100 consists of a time projection chamber where the energy and the spatial pattern of the ionising particles in the detector are precisely retrieved using two sensor planes (one with photo-multiplier tubes and the other with silicon photo-multipliers). The detector has been operating at stable conditions using argon and xenon gases at $$\sim $$ 4 bar and drift fields of $$74\hbox { V cm}^{-1}$$ and $$118\hbox { V cm}^{-1}$$ , respectively. Alpha decays from the $$^{222}$$ Rn chain have been used to test and monitor the stability of the detector, showing a constant electron lifetime in the drift volume. In this paper, in addition to reporting the results of the commissioning run, we provide a detailed description of the NEXT-100 detector, describe its assembly, and present the current estimation of the radiopurity budget. - Open Access
AIRPET: Virtual Positron Emission Tomography
Positron Emission Tomography (PET) is a powerful medical imaging technique, but the design and evaluation of new PET scanner technologies present significant challenges. The process is typically divided into three major stages: 1. detector design and simulation, 2. image reconstruction, and 3. image interpretation. Each of these stages requires significant expertise, making it difficult for individuals or small teams to manage all three at once. AIRPET (AI-driven Revolution in Positron Emission Tomography) is a web-based platform designed to address this challenge by integrating all phases of PET design into a single, accessible, and AI-assisted workflow. AIRPET provides an interface to large language models (LLMs) for assisted geometry creation and an interface for basic PET image reconstruction with the potential for further expansion. Here we introduce AIRPET and outline its current functionality and proposed additions.
Open AccessAIRPET: Virtual Positron Emission Tomography
Positron Emission Tomography (PET) is a powerful medical imaging technique, but the design and evaluation of new PET scanner technologies present significant challenges. The process is typically divided into three major stages: 1. detector design and simulation, 2. image reconstruction, and 3. image interpretation. Each of these stages requires significant expertise, making it difficult for individuals or small teams to manage all three at once. AIRPET (AI-driven Revolution in Positron Emission Tomography) is a web-based platform designed to address this challenge by integrating all phases of PET design into a single, accessible, and AI-assisted workflow. AIRPET provides an interface to large language models (LLMs) for assisted geometry creation and an interface for basic PET image reconstruction with the potential for further expansion. Here we introduce AIRPET and outline its current functionality and proposed additions.