A. Rodríguez
A5104474389- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Superconducting and THz Device Technology
- Immunodeficiency and Autoimmune Disorders
- Astronomy and Astrophysical Research
- Quantum Mechanics and Applications
- Ion-surface interactions and analysis
- Chronic Lymphocytic Leukemia Research
- Age of Information Optimization
- Quantum Chromodynamics and Particle Interactions
- Mass Spectrometry Techniques and Applications
- Blood disorders and treatments
- Photocathodes and Microchannel Plates
- Chemical Thermodynamics and Molecular Structure
Universidad de Oviedo
2024
Hospital Universitario Virgen del Rocío
2024
EIA University
2021
Pennsylvania State University
2021
Virginia Tech
2021
Universidad de Zaragoza
2007-2016
Imperial College London
2015
Doğuş University
2015
Acıbadem Adana Hospital
2015
Centro Universitario de la Defensa
2015
We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From absence of excess X-rays when magnet was pointing Sun, we set an upper limit on axion-photon coupling 8.8 x 10^{-11} GeV^{-1} at 95% CL m_a <~ 0.02 eV. This result is best experimental over a broad range axion masses and eV also supersedes previous derived from energy-loss arguments globular-cluster stars.
The Deep Underground Neutrino Experiment (DUNE) is an international, world-class experiment aimed at exploring fundamental questions about the universe that are forefront of astrophysics and particle physics research. DUNE will study pertaining to preponderance matter over antimatter in early universe, dynamics supernovae, subtleties neutrino interaction physics, a number beyond Standard Model topics accessible powerful beam. A critical component program involves changes beam neutrinos,...
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
We present the case for a dark matter detector with directional sensitivity. This document was developed at 2009 CYGNUS workshop on detection, and contains contributions from theorists experimental groups in field. describe need sensitivity; each experiment presents their project's status; we close feasibility study scaling up to one ton detector, which would cost around $150M.
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the range 0.64 eV ≲ ma 1.17 eV. This closes gap to cosmological hot dark matter limit and actually overlaps it. From absence of excess x rays when magnet was pointing Sun we set a typical upper on axion-photon coupling gaγ 3.3 × 10(-10) GeV(-1) at 95% C.L., exact value depending pressure setting. Future direct axion searches will focus increasing sensitivity smaller values gaγ, example by...
In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces strong flux by bremsstrahlung, Compton scattering, and axio-recombination, ``BCA processes.'' Based on new calculation of this flux, including for first time we derive limits Yukawa coupling gae axion-photon interaction strength gaγ using CAST phase-I data (vacuum phase). For ma≲10 meV/c2 find < 8.1 × 10−23 GeV−1 at 95% CL. We stress that next-generation helioscope such as proposed IAXO could...
The CERN Axion Solar Telescope (CAST) searches for $a\ensuremath{\rightarrow}\ensuremath{\gamma}$ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward Sun. Two parallel bores filled with helium adjustable pressure to match x-ray refractive mass ${m}_{\ensuremath{\gamma}}$ axion search ${m}_{a}$. After vacuum phase (2003--2004), which is optimal ${m}_{a}\ensuremath{\lesssim}0.02\text{ }\text{ }\mathrm{eV}$, we used $^{4}\mathrm{He}$ 2005--2007...
The CERN Axion Solar Telescope (CAST) has been in operation and taking data since 2003. main objective of the CAST experiment is to search for a hypothetical pseudoscalar boson, axion, which might be produced core sun. basic physics process based on time inverted Primakoff effect, by an axion can converted into detectable photon external electromagnetic field. resulting x-ray photons are expected thermally distributed between 1 7 keV. most sensitive detector system pn-CCD combined with...
Axion helioscopes aim at the detection of solar axions through their conversion into x-rays in laboratory magnetic fields. The use low background x-ray detectors is an essential component contributing to sensitivity these searches. Here we review recent advances on Micromegas used CERN Solar Telescope (CAST) and proposed for future International Observatory (IAXO). most setups CAST have achieved levels 1.5 × 10−6 keV−1 cm−2 s−1, a factor more than 100 lower ones obtained by first generation...
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...
Micromegas detectors are an optimum technological choice for the detection of low energy x-rays. The background techniques applied to these yielded remarkable reductions over years, being CAST experiment beneficiary developments. In this document we report on latest upgrades towards further and better understanding detectors' response. encompass readout electronics, a new detector design implementation more efficient cosmic muon veto system. Background levels below 10−6keV-1cm-2s-1 have been...
The International Axion Observatory (IAXO) is a new generation axion helioscope aiming at sensitivity to the axion-photon coupling of few 10$^{12}$ GeV$^{-1}$, i.e. 1 - 1.5 orders magnitude beyond one currently achieved by CAST. project relies on improvements in magnetic field volume together with extensive use x-ray focusing optics and low background detectors, innovations already successfully tested Additional physics cases IAXO could include detection electron-coupled axions invoked solve...
Micromesh gas amplification structures (Micromegas) can be used as readout of Time Projection Chambers in the field Rare Event searches dealing with dark matter, double beta decay or solar axions. The topological information events offered by these gaseous detectors is a very powerful tool for signal identification and background rejection. However, this kind experiments radiopurity detector components surrounding materials must thoroughly controlled addition order to keep experimental low...
MICROMEGAS detectors have been running in the CERN Axion Solar Telescope (CAST) experiment since 2002. The detector, constructed of low radioactivity materials, operated efficiently exploiting its good spatial and energy resolution detector as well time information contained pulse shape events. Last year Microbulk were installed achieving very background levels thanks to improved performances upgraded shielding. performance during 2008 data-taking recent studies will be presented.
We present the results of a search for high-energy axion emission signal from 7Li (0.478 MeV) and D(p,gamma)3He (5.5 nuclear transitions using low-background gamma-ray calorimeter during Phase I CAST experiment. These so-called "hadronic axions" could provide solution to long-standing strong-CP problem can be emitted solar core M1 transitions. This is first such pseudoscalar bosons with couplings nucleons conducted helioscope approach. No excess above background was found.
The T-REX project aims at developing novel readout techniques for Time Projection Chambers in experiments searching rare events. enhanced performance of the latest Micromegas readouts issues like energy resolution, gain stability, homogeneity, material budget, combined with low background techniques, is opening new windows opportunity their application this field. Here we review results regarding use and prospects axion physics (CAST future helioscope), as well R&D carried out within NEXT,...
We report on results obtained with the NEXT-DEMO prototype of NEXT-100 high-pressure xenon gas time projection chamber (TPC), exposed to an alpha decay calibration source. Compared our previous measurements particles, upgraded detector and improved analysis techniques have been used. measure event-by-event correlated fluctuations between ionization scintillation due electron-ion recombination in gas, correlation coeffcients -0.80 -0.56 depending drift field conditions. By combining two...
In this letter, we report on the performance of scintillating sapphire bolometers developed in framework ROSEBUD (Rare Objects Search with Bolometers UnDerground) Collaboration devoted to dark matter searches. The simultaneous measurement heat and light allows discrimination type particle increasing sensitivity for these A versus negative correlation gamma events has been observed. Its interpretation, a simple framework, estimation yield undoped at temperature about 20 mK under gamma, alpha,...
The last generation of micromegas, called microbulk, are ahead classical gas detectors (or even other kind micro-pattern detectors) in gain stability, efficiency (by operation at high pressure), simplicity, robustness, energy resolution, readout features and radiopurity. This makes them a competent solution the field Rare Event Searches, where low background is most appreciated feature detector. CAST (CERN Axion Solar Telescope) experiment best example their application X-rays range. In...
We have studied low-background techniques in order to improve the background level for Micromegas detectors. These detectors are good candidates rare event searches thanks low mass and radiopurity of materials used construction; moreover they discrimination capabilities. The motivation these studies is reduction CAST experiment where three four operating currently microbulk type. last result experience acquired has been by a factor 4.5 two experiment, corresponding an improvement 2 signal strength.