H. Almazán
A5089737718- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Nuclear physics research studies
- CCD and CMOS Imaging Sensors
- Computational Physics and Python Applications
- Gyrotron and Vacuum Electronics Research
- Photocathodes and Microchannel Plates
- Particle accelerators and beam dynamics
- Advanced Optical Sensing Technologies
- Cosmology and Gravitation Theories
- Radiation Therapy and Dosimetry
- Particle Accelerators and Free-Electron Lasers
- Laser Design and Applications
University of Manchester
2022-2024
Manchester University
2023-2024
Max Planck Institute for Nuclear Physics
2016-2023
Ben-Gurion University of the Negev
2023
Instituto de Instrumentación para Imagen Molecular
2023
Universitat Politècnica de València
2023
Universidad de Zaragoza
2023
Harvard University
2022
Donostia International Physics Center
2021
The STEREO experiment is a very short baseline reactor antineutrino experiment. It designed to test the hypothesis of light sterile neutrinos being cause deficit observed interaction rate at baselines with respect predicted rate, known as anomaly. measures energy spectrum in six identical detector cells covering between 9 and 11 m from compact core ILL research reactor. In this article, results 179 days turned on 235 off are reported high degree detail. current include improvements modelling...
The reactor antineutrino anomaly might be explained by the oscillation of antineutrinos toward a sterile neutrino eV mass. In order to explore this hypothesis, STEREO experiment measures energy spectrum in six different detector cells covering baselines between 9 and 11 m from compact core ILL research reactor. Letter, results 66 days turned on 138 off are reported. A novel method extract rates has been developed based distribution pulse shape discrimination parameter. test new is performed...
The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ 13 using reactor $$ \overline{\nu_{\mathrm{e}}} observed via inverse beta decay reaction in which neutron is captured on hydrogen. This based 462.72 live days data, approximately twice as much data previous such analysis, collected with detector positioned at an average distance 1050 m from two cores. Several novel techniques have been developed to achieve significant reductions backgrounds and systematic...
The STEREO experiment is a very short baseline reactor antineutrino aiming at testing the hypothesis of light sterile neutrinos as an explanation deficit observed neutrino interaction rate with respect to predicted rate, known Reactor Antineutrino Anomaly. detector center located 10 m away from compact, highly 235U enriched core research nuclear Institut Laue Langevin in Grenoble, France. This paper describes site, components and associated shielding designed suppress external sources...
A bstract The NEXT experiment aims at the sensitive search of neutrinoless double beta decay in 136 Xe, using high-pressure gas electroluminescent time projection chambers. NEXT-White detector is first radiopure demonstrator this technology, operated Laboratorio Subterráneo de Canfranc. Achieving an energy resolution 1% FWHM 2.6 MeV and further background rejection by means topology reconstructed tracks, has been exploited beyond its original goals order to perform a neu- trinoless search....
If neutrinoless double beta decay is discovered, the next natural step would be understanding lepton number violating physics responsible for it. Several alternatives exist beyond exchange of light neutrinos. Some these mechanisms can distinguished by measuring phase-space observables, namely opening angle $\cos\theta$ among two electrons, and electron energy spectra, $T_1$ $T_2$. In this work, we study statistical accuracy precision in kinematic observables a future xenon gas detector with...
We investigate the performance of Opticks, an NVIDIA OptiX API 7.5 GPU-accelerated photon propagation compared with a single-threaded Geant4 simulation. compare simulations using improved model NEXT-CRAB-0 gaseous time projection chamber. Performance results suggest that Opticks improves simulation speeds by between $58.47\pm{0.02}$ and $181.39\pm{0.28}$ times relative to CPU-only these vary different types GPU CPU. A detailed comparison shows number detected photons, along their...
We report a measurement of the half-life 136Xe two-neutrino double-β decay performed with novel direct-background-subtraction technique. The analysis relies on data collected NEXT-White detector operated 136Xe-enriched and 136Xe-depleted xenon, as well topology double-electron tracks. With fiducial mass only 3.5 kg Xe, 2.34+0.80−0.46(stat)+0.30−0.17(sys)×1021yr is derived from background-subtracted energy spectrum. presented technique demonstrates feasibility unique...
This article reports the measurement of $^{235}$U-induced antineutrino spectrum shape by STEREO experiment. 43'000 antineutrinos have been detected at about 10 m from highly enriched core ILL reactor during 118 full days equivalent nominal power. The measured inverse beta decay is unfolded to provide a pure $^{235}$U in energy. A careful study unfolding procedure, including cross-validation an independent framework, has shown that no major biases are introduced method. significant local...
This article describes the setup and performance of near far detectors in Double Chooz experiment. The electron antineutrinos nuclear power plant were measured two identically designed with different average baselines about 400 m 1050 from reactor cores. Over many years data taking neutrino signals extracted interactions goal measuring a fundamental parameter context oscillation, mixing angle {\theta}13. central part was main detector comprising four cylindrical volumes filled organic...
The PROSPECT and STEREO collaborations present a combined measurement of the pure ^{235}U antineutrino spectrum, without site specific corrections or detector-dependent effects. spectral measurements two highest precision experiments at research reactors are found to be compatible with χ^{2}/ndf=24.1/21, allowing joint unfolding prompt energy into energy. This ν[over ¯]_{e} spectrum is provided community, an excess events relative Huber model in 5-6 MeV region. When Gaussian bump fitted...
We report a measurement of the antineutrino rate from fission ^{235}U with STEREO detector using 119 days reactor turned on. In our analysis, we perform several detailed corrections and achieve most precise single at reactors highly enriched fuel. measure an IBD cross section per σ_{f}=(6.34±0.06[stat]±0.15[sys]±0.15[model])×10^{-43} cm^{2}/fission observe deficit (5.2±0.8[stat]±2.3[sys]±2.3[model])% compared to model, consistent world average. Testing as sole source deficit, find tension...
Abstract. The STEREO experiment measures the electron antineutrino spectrum emitted in a research reactor using inverse beta decay reaction on H nuclei gadolinium loaded liquid scintillator. detection is based signal coincidence of prompt positron and delayed neutron capture event. simulated response crucial for comparison with data, particular case efficiency. Among all stable isotopes, 155 Gd 157 have highest cross sections thermal capture. excited after emit gamma rays total energy about...
Different extensions of the standard model particle physics, such as braneworld or mirror matter models, predict existence a neutron sterile state, possibly dark candidate. This Letter reports new experimental constraint on probability p for conversion into hidden neutron, set by STEREO experiment at high flux reactor Institut Laue-Langevin. The limit is p<3.1×10^{-11} 95% C.L. improving previous factor 13. result demonstrates that short-baseline neutrino experiments can be used competitive...
If neutrinos are their own antiparticles the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay can occur. The very long lifetime expected for these exceptional events makes its detection a daunting task. In order to conduct an almost background-free experiment, NEXT collaboration is investigating novel synthetic molecular sensors that may capture Ba dication produced in of certain Xe isotopes high-pressure gas experiment. use such detectors immobilized on surfaces...
A study on cosmic muons has been performed for the two identical near and far neutrino detectors of Double Chooz experiment, placed at $\sim$120 $\sim$300 m.w.e. underground respectively, including corresponding simulations using MUSIC simulation package. This characterization allowed to measure muon flux reaching both be (3.64 $\pm$ 0.04) $\times$ 10$^{-4}$ cm$^{-2}$s$^{-1}$ detector (7.00 0.05) 10$^{-5}$ one. The seasonal modulation signal also studied observing a positive correlation with...
We present a search for signatures of neutrino mixing electron anti-neutrinos with additional hypothetical sterile flavors using the Double Chooz experiment. The is based on data from 5 years operation Chooz, including 2 in two-detector configuration. analysis profile likelihood, i.e.\ comparing to model prediction disappearance data-to-data comparison two respective detectors. optimized three active and one neutrino. It sensitive typical mass range $5 \cdot 10^{-3} $ eV$^2 \lesssim \Delta...
Abstract Noble element time projection chambers are a leading technology for rare event detection in physics, such as dark matter and neutrinoless double beta decay searches. Time typically assign position the drift direction using relative timing of prompt scintillation delayed charge collection signals, allowing reconstruction an absolute direction. In this paper, alternate methods assigning distance via quantification electron diffusion pure high pressure xenon gas chamber explored. Data...
Using the Double Chooz detector, designed to measure neutrino mixing angle ${\ensuremath{\theta}}_{13}$, products of ${\ensuremath{\mu}}^{\ensuremath{-}}$ capture on $^{12}\mathrm{C},^{13}\mathrm{C},^{14}\mathrm{N}$, and $^{16}\mathrm{O}$ have been measured. Over a period 489.5 days, $2.3\ifmmode\times\else\texttimes\fi{}{10}^{6}$ stopping cosmic collected, which $1.8\ifmmode\times\else\texttimes\fi{}{10}^{5}$ captured carbon, nitrogen, or oxygen nuclei in inner detector scintillator acrylic...
Abstract The search for neutrinoless double beta decay (0 νββ ) remains one of the most compelling experimental avenues discovery in neutrino sector. Electroluminescent gas-phase time projection chambers are well suited to 0 searches due their intrinsically precise energy resolution and topological event identification capabilities. Scalability ton- multi-ton masses requires readout large-area electroluminescent regions with fine spatial resolution, low radiogenic backgrounds, a scalable...