J. M. López-Castaño
A5017043955- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Noncommutative and Quantum Gravity Theories
- Quantum Mechanics and Applications
- Muon and positron interactions and applications
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
- Color Science and Applications
- Atmospheric Ozone and Climate
- Image and Signal Denoising Methods
- Magnetic confinement fusion research
- Quantum, superfluid, helium dynamics
- Scientific Research and Discoveries
- Atmospheric and Environmental Gas Dynamics
- Infrared Target Detection Methodologies
- Nuclear Physics and Applications
- Computational Physics and Python Applications
- Particle accelerators and beam dynamics
- Crystallography and Radiation Phenomena
Oak Ridge National Laboratory
2022-2024
University of South Dakota
2019-2022
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2012-2022
Campbell Collaboration
2022
Institut de Recherche sur les Lois Fondamentales de l'Univers
2019
Laboratoire AstroParticule et Cosmologie
2019
RWTH Aachen University
2013-2014
Hiroshima Institute of Technology
2013
Illinois Institute of Technology
2013
The Double Chooz experiment has observed 8249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years ($\mathrm{\text{reactor power}}\ifmmode\times\else\texttimes\fi{}\mathrm{\text{detector mass}}\ifmmode\times\else\texttimes\fi{}\mathrm{\text{live time}}$) exposure using a $10.3\text{ }\text{ }{\mathrm{m}}^{3}$ fiducial volume detector located at 1050 m from the reactor cores of nuclear power plant France. expectation case ${\ensuremath{\theta}}_{13}=0$ is 8937...
The Double Chooz experiment presents improved measurements of the neutrino mixing angle θ 13 using data collected in 467.90 live days from a detector positioned at an average distance 1050 m two reactor cores nuclear power plant. Several novel techniques have been developed to achieve significant reductions backgrounds and systematic uncertainties with respect previous publications, whereas efficiency $$ {\overline{\nu}}_e signal has increased. value is measured be sin2 2θ = 0.090 − 0.029 +...
The Majorana Demonstrator searched for neutrinoless double-β decay (0νββ) of ^{76}Ge using modular arrays high-purity Ge detectors operated in vacuum cryostats a low-background shield. with up to 40.4 kg (27.2 enriched ∼88% ^{76}Ge). From these measurements, the has accumulated 64.5 yr active exposure. With world-leading energy resolution 2.52 keV FWHM at 2039 Q_{ββ} (0.12%), we set half-life limit 0νββ T_{1/2}>8.3×10^{25} (90% C.L.). This provides range upper limits on m_{ββ} (113-269) meV...
The Double Chooz experiment has determined the value of neutrino oscillation parameter $\theta_{13}$ from an analysis inverse beta decay interactions with neutron capture on hydrogen. This uses a three times larger fiducial volume than standard assessment, which is restricted to region doped gadolinium (Gd), yielding exposure 113.1 GW-ton-years. data sample used in this distinct that Gd analysis, and systematic uncertainties are also largely independent, some exceptions, such as reactor flux...
The Majorana Demonstrator neutrinoless double-beta decay experiment comprises a 44 kg (30 enriched in ^{76}Ge) array of p-type, point-contact germanium detectors. With its unprecedented energy resolution and ultralow backgrounds, also searches for rare event signatures from beyond standard model physics the low region below 100 keV. In this Letter, we test continuous spontaneous localization (CSL) model, one mathematically well-motivated wave function collapse models aimed at solving...
The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ 13 using reactor $$ \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...
We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring sidereal time dependence events, is first test invariance using reactor-based source. No variation data and disappearance results are consistent independent oscillations. Under Standard-Model Extension, we set limits on 14 violating coefficients associated transitions between tau flavor, two competitive muon flavor.
The oscillation results published by the Double Chooz Collaboration in 2011 and 2012 rely on background models substantiated reactor-on data. In this analysis, we present a background-model-independent measurement of mixing angle θ13 including 7.53 days reactor-off A global fit observed antineutrino rates for different reactor power conditions is performed, yielding both total rate. are improved significantly data fit, as it provides direct This rate modulation analysis considers candidates...
Ta180m is a rare nuclear isomer whose decay has never been observed. Its remarkably long lifetime surpasses the half-lives of all other known β and electron capture decays due to large K-spin differences small energy between isomeric lower-energy states. Detecting its presents significant experimental challenge but could shed light on neutrino-induced nucleosynthesis mechanisms, nature dark matter, violation. For this study, we repurposed Majorana Demonstrator, an search for neutrinoless...
With excellent energy resolution and ultralow-level radiogenic backgrounds, the high-purity germanium detectors in Majorana Demonstrator enable searches for several classes of exotic dark matter (DM) models. In this work, we report new experimental limits on keV-scale sterile neutrino DM via transition magnetic moment from conversion to active neutrinos νs→νa. We fermionic absorption (χ+A→ν+A) sub-GeV DM-nucleus 3→2 scattering (χ+χ+A→ϕ+A), exclusion bosonic (axionlike particles photons)....
Background: The MAJORANA DEMONSTRATOR , a modular array of isotopically enriched high-purity germanium (HPGe) detectors, was constructed to demonstrate backgrounds low enough justify building tonne-scale experiment search for the neutrinoless double-beta decay ($\beta\beta(0\nu)$) $^{76}\mathrm{Ge}$. Purpose: This paper presents description instrument, its commissioning, and operations. It covers electroforming, underground infrastructure, enrichment, detector fabrication, low-background...
Double Chooz is unique among modern reactor-based neutrino experiments studying $\bar \nu_e$ disappearance in that data can be collected with all reactors off. In this paper, we present from 7.53 days of reactor-off running. Applying the same selection criteria as used reactor-on oscillation analysis, a measured background rate 1.0$\pm$0.4 events/day obtained. The model for accidentals, cosmogenic $\beta$-$n$-emitting isotopes, fast neutrons cosmic muons, and stopped-$\mu$ decays analysis...
Axions were originally proposed to explain the strong-$CP$ problem in QCD. Through axion-photon coupling, Sun could be a major source of axions, which measured solid state detection experiments with enhancements due coherent Primakoff-Bragg scattering. The Majorana Demonstrator experiment has searched for solar axions set $^{76}\mathrm{Ge}$-enriched high purity germanium detectors using 33 kg-yr exposure collected between January, 2017 and November, 2019. A temporal-energy analysis gives new...
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...
P-type point contact (PPC) HPGe detectors are a leading technology for rare event searches due to their excellent energy resolution, low thresholds, and multi-site rejection capabilities. We have characterized PPC detector's response $\alpha$ particles incident on the sensitive passivated p+ surfaces, previously poorly-understood source of background. The detector studied is identical those in MAJORANA DEMONSTRATOR experiment, search neutrinoless double-beta decay ($0\nu\beta\beta$)...
P-type point contact (PPC) high-purity germanium detectors are an important technology in astroparticle and nuclear physics due to their superb energy resolution, low noise, pulse shape discrimination capabilities. Analysis of data from the Majorana Demonstrator, a neutrinoless double-β decay experiment deploying PPC enriched Ge76, has led several novel improvements analysis signals. In this work we discuss charge trapping its effect on resolution. Small dislocations or impurities crystal...
The Double Chooz experiment measures the neutrino mixing angle θ 13 by detecting reactor $$ {\overline{\nu}}_e via inverse beta decay. positron-neutron space and time coincidence allows for a sizable background rejection, nonetheless liquid scintillator detectors would profit from positron/electron discrimination, if feasible in large detector, to suppress remaining background. Standard particle identification, based on dependent profile of photon emission scintillator, can not be used given...
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...
The majorana demonstrator is a neutrinoless double-β decay search consisting of low-background modular array high-purity germanium detectors, ∼2/3 which are enriched to 88% in 76Ge. experiment also searching for double-beta 76Ge excited states (e.s.) 76Se. can into three daughter 76Se, with clear event signatures ββ-decay followed by the prompt emission one or two γ rays. This results high probability multi-detector coincidences. granularity detector enables powerful discrimination this...
Abstract The Majorana Demonstrator was a search for neutrinoless double-beta decay (0 νββ ) in the 76 Ge isotope. It staged at 4850-foot level of Sanford Underground Research Facility (SURF) Lead, SD. experiment consisted 58 germanium detectors housed low background shield and calibrated once per week by deploying 228 Th line source 1 to 2 hours. energy scale calibration determination detector array automated using custom analysis tools. We describe offline procedure detectors, including...