R. F. García Ruíz
A5084709404- Nuclear physics research studies
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Mass Spectrometry Techniques and Applications
- Advanced NMR Techniques and Applications
- Astronomical and nuclear sciences
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Inorganic Fluorides and Related Compounds
- Quantum Chromodynamics and Particle Interactions
- Molecular Spectroscopy and Structure
- Laser-Matter Interactions and Applications
- Astro and Planetary Science
- Laser-induced spectroscopy and plasma
- Spectroscopy and Laser Applications
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Ion-surface interactions and analysis
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- History and advancements in chemistry
Massachusetts Institute of Technology
2020-2025
European Organization for Nuclear Research
2018-2024
KU Leuven
2013-2023
University of Oxford
2023
Oak Ridge National Laboratory
2022
University of Manchester
2016-2022
Federico Villarreal National University
2013-2021
Universidad de Burgos
2009-2010
Nuclear charge radii are sensitive probes of different aspects the nucleon-nucleon interaction and bulk properties nuclear matter; thus, they provide a stringent test challenge for theory. The calcium region has been particular interest, as experimental evidence suggested new magic number at $N = 32$ [1-3], while unexpectedly large increases in [4,5] open questions about evolution size neutron-rich systems. By combining collinear resonance ionization spectroscopy method with $\beta$-decay...
Abstract Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances ability create, cool, control complex molecules down quantum level, along with recent upcoming species production at several facilities around world, create compelling opportunity coordinate combine these efforts bring precision measurement extreme nuclei. In...
Abstract Molecular spectroscopy offers opportunities for the exploration of fundamental laws nature and search new particle physics beyond standard model 1–4 . Radioactive molecules—in which one or more atoms possesses a radioactive nucleus—can contain heavy deformed nuclei, offering high sensitivity investigating parity- time-reversal-violation effects 5,6 Radium monofluoride, RaF, is particular interest because it predicted to have an electronic structure appropriate laser cooling 6 , thus...
The change in mean-square nuclear charge radii δ⟨r2⟩ along the even-A tin isotopic chain 108−134Sn has been investigated by means of collinear laser spectroscopy at ISOLDE/CERN using atomic transitions 5p2 1S0→5p6 s1P1 and 3P0→5p6s 3P1. With determination radius 134Sn corrected values for some neutron-rich isotopes, evolution across N=82 shell closure is established. A clear kink doubly magic 132Sn revealed, similar to what observed other chains with larger proton numbers, N=126 208Pb. While...
Abstract One of the most important properties influencing chemical behavior an element is electron affinity (EA). Among remaining elements with unknown EA astatine, where one its isotopes, 211 At, remarkably well suited for targeted radionuclide therapy cancer. With At − anion being involved in many aspects current astatine labeling protocols, knowledge this prime importance. Here we report measured value to be 2.41578(7) eV. This result compared state-of-the-art relativistic quantum...
Collinear laser spectroscopy is performed on the nickel isotopes ^{58-68,70}Ni, using a time-resolved photon counting system. From measured isotope shifts, nuclear charge radii R_{c} are extracted and compared to theoretical results. Three ab initio approaches all employ, among others, chiral interaction NNLO_{sat}, which allows an assessment of their accuracy. We find agreement with experiment in differential δ⟨r_{c}^{2}⟩ for employed methods interactions, while absolute consistent data...
The nuclear charge radius of $^{32}\mathrm{Si}$ was determined using collinear laser spectroscopy. experimental result confronted with ab initio lattice effective field theory, valence-space in-medium similarity renormalization group, and mean calculations, highlighting important achievements challenges modern many-body methods. completes the radii mirror pair $^{32}\mathrm{Ar}\text{\ensuremath{-}}^{32}\mathrm{Si}$, whose difference correlated to slope $L$ symmetry energy in equation state....
We investigate the effects of two-body currents on magnetic dipole moments medium-mass and heavy nuclei using valence-space in-medium similarity renormalization group with chiral effective field theory interactions currents. Focusing near doubly magic from oxygen to bismuth, we have found that leading globally improve agreement experimental moments. Moreover, our results show importance multishell for <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
We report on the measurement of optical isotope shifts for 38, 39, 42, 44, 46–51K relative to 47K from which changes in nuclear mean square charge radii across N=28 shell closure are deduced. The investigation was carried out by bunched-beam collinear laser spectroscopy at CERN-ISOLDE radioactive ion-beam facility. Mean now known 37K 51K, covering all νf7/2-shell as well νp3/2-shell nuclei. These measurements, conjunction with those Ca, Cr, Mn and Fe, provide a first insight into Z...
New technical developments have led to a 2 orders of magnitude improvement the resolution collinear resonance ionization spectroscopy (CRIS) experiment at ISOLDE, CERN, without sacrificing high efficiency CRIS technique. Experimental linewidths 20(1) MHz were obtained on radioactive beams francium, allowing us for first time determine electric quadrupole moment short lived [t_{1/2}=22.0(5) ms] ^{219}Fr Q_{s}=-1.21(2) eb, which would not been possible advantages offered by new method. This...
Measurements of atomic transitions in different isotopes offer key information on the nuclear charge radius. The anticipated high-precision experimental techniques, augmented by calculations, will soon enable extraction higher order radial moments density distribution. To assess value such measurements for structure research, we study content fourth moment $\ensuremath{\langle}{r}^{4}\ensuremath{\rangle}$ means functional theory and a multiple correlation analysis. We show that can be...
We present a comprehensive theoretical study of the ionization potentials $M\mathrm{F}$ $(M=\mathrm{Ca}, \mathrm{Sr}, \mathrm{and} \mathrm{Ba})$ molecules using state-of-the-art relativistic coupled-cluster approach with single, double, and perturbative triple excitations [CCSD(T)]. have further corrected our results for higher-order (up to full triples) QED self-energy vacuum-polarization contributions. performed an extensive investigation effect various computational parameters on...
Abstract The development of atomic many-body methods, capable incorporating electron correlation effects accurately, is required for isotope shift (IS) studies. In combination with precise measurements, such calculations help to extract nuclear charge radii differences, and probe signatures physics beyond the Standard Model particle physics. We review here a few recently-developed methods in relativistic perturbation theory (RMBPT) coupled-cluster (RCC) frameworks IS factors highly charged...
We report on the masses and hyperfine structure of ground isomeric states in 114,116,118,120Ag isotopes, measured with phase-imaging ion-cyclotron-resonance technique (PI-ICR) JYFLTRAP mass spectrometer collinear laser spectroscopy beamline at Ion Guide Isotope Separator On-Line facility, Jyväskylä, Finland. excitation energies, electromagnetic moments, charge radii, firmly established nuclear spins long-lived states. A new isomer was discovered 118Ag half-lives were reevaluated....
The magnetic moments and isotope shifts of the neutron-deficient francium isotopes (202-205)Fr were measured at ISOLDE-CERN with use collinear resonance ionization spectroscopy. A production-to-detection efficiency 1% was for (202)Fr. background from nonresonant collisional maintained below one ion in 10(5) beam particles. Through a comparison charge radii predictions spherical droplet model, it is concluded that ground-state wave function remains down to (205)Fr, departure observed (203)Fr (N=116).
Collinear laser spectroscopy is performed on the _{30}^{79}Zn_{49} isotope at ISOLDE-CERN. The existence of a long-lived isomer with few hundred milliseconds half-life confirmed, and nuclear spins moments ground isomeric states in ^{79}Zn as well shift are measured. From observed hyperfine structures, I=9/2 I=1/2 firmly assigned to states. magnetic moment μ (^{79}Zn)=-1.1866(10)μ_{N}, confirms spin-parity 9/2^{+} νg_{9/2}^{-1} shell-model configuration, excellent agreement prediction from...
Background: The neutron-rich calcium isotopes have gained particular interest as evidence of closed-shell structures has recently been found in two exotic nuclei, at $N=32$ and $N=34$. Additionally, the study such systems revealed new aspects nuclear forces, regarding role three-nucleon forces.Purpose: We electromagnetic properties Ca around neutron number $N=32$.Methods: High-resolution bunched-beam collinear laser spectroscopy was used to measure optical hyperfine spectra...
We present the first laser spectroscopic measurement of neutron-rich nucleus ^{68}Ni at N=40 subshell closure and extract its nuclear charge radius. Since this is only short-lived isotope for which dipole polarizability α_{D} has been measured, combination these observables provides a benchmark structure theory. compare them to novel coupled-cluster calculations based on different chiral two- three-nucleon interactions, strong correlation between radius observed, similar stable ^{48}Ca....
Isotope shifts of $^{223-226,228}$Ra$^{19}$F were measured for different vibrational levels in the electronic transition $A^{2}{}{\Pi}_{1/2}\leftarrow X^{2}{}{\Sigma}^{+}$. The observed isotope demonstrate particularly high sensitivity radium monofluoride to nuclear size effects, offering a stringent test models describing density within nucleus. Ab initio quantum chemical calculations are excellent agreement with experimental observations. These results highlight some unique opportunities...
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well those reached directly at high energy colliders. Discrimination between different models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss current status prospects near future a compelling suite such experiments, along with developments needed encompassing theoretical framework.