A. Garcı́a
A5038968502- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Advanced NMR Techniques and Applications
- Astronomical and nuclear sciences
- Radioactive Decay and Measurement Techniques
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced Chemical Physics Studies
- Particle accelerators and beam dynamics
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Astrophysics and Cosmic Phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Computational Physics and Python Applications
Seattle University
1991-2025
Medical University of Lublin
2025
Hackensack University Medical Center
2024
California University of Pennsylvania
2024
University of Washington
2014-2023
Argonne National Laboratory
2016
University of Notre Dame
1995-2012
Instituto Politécnico Nacional
1980-2008
Center for Research and Advanced Studies of the National Polytechnic Institute
1980-2008
Autonomous University of San Luis Potosí
2007
We present the first results of Fermilab Muon g-2 Experiment for positive muon magnetic anomaly $a_\mu \equiv (g_\mu-2)/2$. The is determined from precision measurements two angular frequencies. Intensity variation high-energy positrons decays directly encodes difference frequency $\omega_a$ between spin-precession and cyclotron frequencies polarized muons in a storage ring. ring field measured using nuclear resonance probes calibrated terms equivalent proton spin precession...
The available data on nuclear fusion cross sections important to energy generation in the Sun and other hydrogen-burning stars solar neutrino production are summarized critically evaluated. Recommended values uncertainties provided for key sections, a recommended spectrum is given $^{8}\mathrm{B}$ neutrinos. Opportunities further increasing precision of rates also discussed, including new facilities, experimental techniques, improvements theory. This review, which summarizes conclusions...
We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
The Muon g-2 Experiment at Fermi National Accelerator Laboratory (FNAL) has measured the muon anomalous precession frequency $ω_a$ to an uncertainty of 434 parts per billion (ppb), statistical, and 56 ppb, systematic, with data collected in four storage ring configurations during its first physics run 2018. When combined a precision measurement magnetic field experiment's ring, determines anomaly $a_μ({\rm FNAL}) = 116\,592\,040(54) \times 10^{-11}$ (0.46 ppm). This article describes...
The Fermi National Accelerator Laboratory has measured the anomalous precession frequency $a^{}_\mu = (g^{}_\mu-2)/2$ of muon to a combined precision 0.46 parts per million with data collected during its first physics run in 2018. This paper documents measurement magnetic field storage ring. is monitored by nuclear resonance systems and calibrated terms equivalent proton spin spherical water sample at 34.7$^\circ$C. weighted distribution resulting $\tilde{\omega}'^{}_p$, denominator ratio...
A neutron $\ensuremath{\beta}$-decay asymmetry measurement using polarized ultracold neutrons (UCN) determines the correlation between spin of and momentum decay electron. The authors extract ratio weak axial-vector to vector couplings with reduced uncertainties. This new result from first this UCN contributes a benchmark for lattice QCD calculations possibility improved precision on CKM matrix element ${V}_{u\phantom{\rule{0}{0ex}}d}$ $\ensuremath{\beta}$ decay.
We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based positive data taken at Fermilab's Muon Campus during 2019 and 2020 accelerator runs. uses $3.1$ GeV$/c$ polarized muons stored in $7.1$-m-radius storage ring with $1.45$ T uniform field. value $ a_{\mu}$ determined from measured difference between spin precession frequency its cyclotron frequency. This normalized to strength field, using Nuclear Magnetic Resonance (NMR). ratio...
A new measurement of the neutron $β$-decay asymmetry $A_0$ has been carried out by UCNA collaboration using polarized ultracold neutrons (UCN) from solid deuterium UCN source at Los Alamos Neutron Science Center (LANSCE). Improvements in experiment have led to reductions both statistical and systematic uncertainties leading $A_0 = -0.11954(55)_{\rm stat.}(98)_{\rm syst.}$, corresponding ratio axial-vector vector coupling $λ\equiv g_A/g_V -1.2756(30)$.
The positron-neutrino correlation in the ${0}^{+}\ensuremath{\rightarrow}{0}^{+}$ $\ensuremath{\beta}$ decay of ${}^{32}\mathrm{Ar}$ was measured at ISOLDE by analyzing effect lepton recoil on shape narrow proton group following superallowed decay. Our result is consistent with standard model prediction. For vanishing Fierz interference we find $a\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.9989\ifmmode\pm\else\textpm\fi{}0.0052\ifmmode\pm\else\textpm\fi{}0.0039$, which yields...
In this paper, we describe the performance of Los Alamos spallation-driven solid-deuterium ultra-cold neutron (UCN) source. Measurements cold flux, very low energy production rate, and UCN rates density at exit from biological shield are presented compared to Monte Carlo predictions. The compare well with predictions code MCNPX agree our custom code. source is shown perform as modeled. maximum delivered 52(9) UCN/cc a solid deuterium volume ∼1500 cm3.
We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from Fermilab Muon $g\!-\!2$ Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, $\tilde{\omega}'^{}_p$, anomalous precession frequency corrected for beam dynamics effects,...
Artificial Intelligence (AI) is rapidly reshaping the landscape of healthcare and societal development, offering transformative solutions to longstanding challenges. This article explores emerging paradigms where AI intersects health society, highlighting its applications in personalized medicine, disease prediction, public surveillance, accessibility. The discussion underscores potential revolutionize medical diagnostics, enhance patient outcomes, bridge gaps systems globally. Concurrently,...
The $\ensuremath{\beta}$-delayed $\ensuremath{\alpha}$ spectrum from the decay of ${}^{8}\mathrm{B}$ has been measured with a setup that minimized systematic uncertainties affected previous measurements. Consequently deduced neutrino presents much smaller than recommendation [J. N. Bahcall et al., Phys. Rev. C 54, 411 (1996)]. $\ensuremath{\nu}$ is found to be harder previously recommended about $(10--20)%$ more neutrinos at energies between 12--14 MeV. integrated cross sections...
A precise measurement of the neutron decay β asymmetry A₀ has been carried out using polarized ultracold neutrons from pulsed spallation source at Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report = -0.119 66±0.000 89{-0.001 40}{+0.001 23}, which determine ratio axial-vector to vector weak coupling nucleon g{A}/g{V}=-1.275 90{-0.004 45}{+0.004 09}.
We present a detailed report of measurement the neutron $\beta$-asymmetry parameter $A_0$, parity-violating angular correlation between spin and decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from pulsed spallation solid deuterium source via transport through 7-T magnetic field. The then transported an adiabatic-fast-passage spin-flipper field region, prior to storage in cylindrical volume situated within 1-T $2 \times 2\pi$ solenoidal...
It has been proposed recently that a previously unobserved neutron decay branch to dark matter particle ($\ensuremath{\chi}$) could account for the discrepancy in lifetime observed experiments use two different measurement techniques. One of possible final states discussed includes single $\ensuremath{\chi}$ along with an ${e}^{+}{e}^{\ensuremath{-}}$ pair. We data from UCNA (Ultracold Neutron Asymmetry) experiment set limits on this channel. Coincident electron-like events are detected...
The proton-rich nuclei ${}^{23}\mathrm{Al}$ and ${}^{27}\mathrm{P}$ were studied using the ${}^{24}\mathrm{Mg}{(}^{7}\mathrm{Li}{,}^{8}\mathrm{He}{)}^{23}\mathrm{Al}$ ${}^{28}\mathrm{Si}{(}^{7}\mathrm{Li}{,}^{8}\mathrm{He}{)}^{27}\mathrm{P}$ reactions, respectively. Several energy levels are observed in each nucleus. mass excess of was measured to be 6.773(28) MeV $\ensuremath{-}0.670(41) \mathrm{MeV}.$ first excited state has been resolved from ground for time at an excitation...
We used the $^{16}\mathrm{O}$${(}^{3}$He,n${)}^{18}$Ne, $^{12}\mathrm{C}$${(}^{12}$C${,}^{6}$He${)}^{18}$Ne, and $^{20}\mathrm{Ne}$(p,t${)}^{18}$Ne reactions to study $^{18}\mathrm{Ne}$ states up an excitation energy of 10 MeV, with emphasis on levels corresponding $^{14}\mathrm{O}$(\ensuremath{\alpha},p${)}^{17}$F $^{17}\mathrm{F}$(p,\ensuremath{\gamma}${)}^{18}$Ne resonances that could strongly affect these reaction rates in hot stellar environments. Excitation energies, widths, absolute...
We report the results of an improved determination triple correlation $D P \cdot(p_{e}\times p_{\nu})$ that can be used to limit possible time-reversal invariance in beta decay polarized neutrons and constrain extensions Standard Model. Our result is $D=(-0.96\pm 1.89 (stat)\pm 1.01 (sys))\times 10^{-4}$. The corresponding phase between g_A g_V $\phi_{AV} = 180.013^\circ\pm0.028^\circ$ (68 % confidence level). This represents most sensitive measurement D decay.
We have measured the electron-capture decay branch of $^{100}\mathrm{Tc}$ to be (1.8\ifmmode\pm\else\textpm\fi{}0.9)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$%, from which we deduce logft=4.${45}_{\mathrm{\ensuremath{-}}0.30}^{+0.18}$. This indicates that a two-step process connecting only ground states $^{100}\mathrm{\ensuremath{-}}^{100}$Tc${\mathrm{\ensuremath{-}}}^{100}$Ru can account for 2\ensuremath{\nu} double-\ensuremath{\beta}-decay rate $^{100}\mathrm{Mo}$.