J. Morales
A5074497777- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- Nuclear physics research studies
- Radioactive Decay and Measurement Techniques
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Radioactivity and Radon Measurements
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Astronomy and Astrophysical Research
- Aging, Health, and Disability
- Advanced NMR Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Molecular Spectroscopy and Structure
- Gastrointestinal motility and disorders
University of Massachusetts Amherst
2022-2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2019
Universidad de Zaragoza
2003-2012
Rice University
2010-2011
Institute of High Energy Physics
2010
CEA Paris-Saclay
2007
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2007
Institute for Nuclear Research
2000
The University of Texas at El Paso
1999
University of South Carolina
1996
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.
Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by Primakoff process. In laboratory magnetic field ("axion helioscope"), they transformed into x-rays energies of few keV. Using decommissioned Large Hadron Collider test magnet, CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from analysis these data are presented here. No signal above background was observed, implying an upper limit to axion-photon coupling...
Abstract Accreting protoplanets are windows into planet formation processes, and high-contrast differential imaging is an effective way to identify them. We report results from the Giant Protoplanet Survey (GAPlanetS), which collected H α imagery of 14 transitional disk host stars with Magellan Adaptive Optics System. To address twin challenges morphological complexity point-spread function instability, GAPlanetS required novel approaches for frame selection optimization Karhounen–Loéve...
Sulfur is an essential element for biological molecules, with sulfate as the primary sulfur source plants. Under sulfate-deficiency, plants undergo physiological, metabolic, transcriptional, and post-transcriptional changes. Although Solanum lycopersicum (tomato) exhibits extensive transcriptome reprogramming during deficiency, role of microRNAs (miRNAs) in this response remains poorly explored. In study, we analyzed miRNAs expression tomato roots leaves at 3- 4-weeks post-sowing under...
One IGEX 76Ge double-beta decay detector is currently operating in the Canfranc Underground Laboratory a search for dark matter WIMPs, through Ge nuclear recoil produced by WIMP elastic scattering. A new exclusion plot, σ(m), has been derived WIMP-nucleon spin-independent interactions. To obtain this result, 40 days of data from (energy threshold Ethr∼4 keV), recently collected, have analyzed. These improve limits all other ionization germanium detectors mass region 20 to 200 GeV, where...
A low-background Micromegas detector has been operating in the CAST experiment at CERN for search solar axions during first phase of (2002–2004). The detector, made out low radioactivity materials, operated efficiently and achieved a very high level background rejection (5 × 10−5 counts keV−1 cm−2 s−1) without shielding.
We have searched for 14.4 keV solar axions or more general axion-like particles (ALPs), that may be emitted in the M1 nuclear transition of 57Fe, by using axion-to-photon conversion CERN Axion Solar Telescope (CAST) with evacuated magnet bores (Phase I). From absence excess monoenergetic X-rays when was pointing to Sun, we set model-independent constraints on coupling constants pseudoscalar couple two photons and a nucleon gaγ|−1.19gaN0+gaN3| < 1.36 × 10−16 GeV−1 ma 0.03 eV at 95% confidence level.
The results of a search for particle dark matter with germanium detector at the Canfranc tunnel are reported. Contour limits cross sections, masses, and local halo densities particles interacting Ge nuclei through spin-independent interactions presented an exposure 130.7 kg day. prospects timing modulation signal also
We propose a novel detection concept for neutrinoless double-beta decay searches. This is based on Time Projection Chamber (TPC) filled with high-pressure gaseous xenon, and separated-function capabilities calorimetry tracking. Thanks to its excellent energy resolution, together powerful background rejection provided by the distinct topological signature, design discussed in this Letter Of Intent promises be competitive possibly out-perform existing proposals next-generation experiments....
Companions embedded in the cavities of transitional circumstellar disks have been observed to exhibit excess luminosity at H$α$, an indication that they are actively accreting. We report 5 years (2013-2018) monitoring position and H$α$ embedded, accreting low-mass stellar companion HD 142527 B from MagAO/VisAO instrument. use pyklip, a python implementation Karhounen-Loeve Image Processing algorithm, detect companion. Using pyklip forward modeling, we constrain relative astrometry $1-2...
The Compact Muon Solenoid (CMS) experiment prepares its Phase-2 upgrade for the high-luminosity era of LHC operation (HL-LHC). Due to increase occupancy, trigger latency and rates, full electronics CMS Drift Tube (DT) chambers will need be replaced. In new design, time bin digitisation chamber signals around 1~ns, totality forwarded asynchronously service cavern at resolution. backend system in charge building primitives each chamber. These contain information level about muon candidates...
Neutrinoless double beta decay measurements are the most promising experiments both to reveal Majorana nature of neutrino and set a value for its mass. The NEXT project propose build High pressure Xenon TPC in Canfranc Underground Laboratory (Huesca, Spain) measure double-beta 136Xe, normal neutrinoless, with source mass 100 kg enriched xenon.
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...