A5026667672- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Advanced X-ray Imaging Techniques
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Medical Imaging Techniques and Applications
- Advanced Chemical Physics Studies
- Particle accelerators and beam dynamics
- High-Energy Particle Collisions Research
- Scientific Research and Discoveries
- Laser Design and Applications
- Aerospace Engineering and Energy Systems
- Inertial Sensor and Navigation
- Physics of Superconductivity and Magnetism
- Advanced Sensor and Control Systems
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
Institute for Basic Science
2016-2024
Universidad de Zaragoza
2019
Brookhaven National Laboratory
1996-2005
Brookhaven College
2002
University of South Carolina
1990-2001
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
1990-1997
Virginia Tech
1990-1997
University of Virginia
1990-1997
Justus-Liebig-Universität Gießen
1997
Ohio University
1997
Hypothetical low-mass particles, such as axions, provide a compelling explanation for the dark matter in universe. Such particles are expected to emerge abundantly from hot interior of stars. To test this prediction, CERN Axion Solar Telescope (CAST) uses 9 T refurbished Large Hadron Collider magnet directed towards Sun. In strong magnetic field, solar axions can be converted X-ray photons which recorded by detectors. 2013–2015 run, thanks low-background detectors and new telescope,...
A new experiment is described to detect a permanent electric dipole moment of the proton with sensitivity $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant are discussed and techniques address them presented. The measurement sensitive physics beyond Standard Model at scale 3000~TeV.
A bstract We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part CERN Solar Telescope (CAST), searching for axion dark matter in 34.67 μ eV mass range. radio frequency cavity consisting 5 sub-cavities coupled by inductive irises took physics data inside CAST dipole magnet first time using this filter-like haloscope geometry. An exclusion limit with 95% credibility level on axion-photon coupling constant g aγ ≳ 4 × 10 − 13 GeV 1 over range 34 ....
The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in 19.74 $\mu$eV to 22.47 mass range. detection concept follows Sikivie haloscope principle, where Dark Matter convert into photons within a resonator immersed magnetic field. is an array of four individual rectangular cavities inserted strong phase-matched maximize sensitivity. Here we report on data acquired 4124 h from 2019 2021. Each cavity equipped with fast frequency tuning mechanism...
New high-precision measurements of $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},\ensuremath{\pi})$ and $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},\ensuremath{\gamma})$ cross sections beam asymmetries have been combined with other polarization ratios in a simultaneous analysis both reactions. Compton scattering has provided two important new constraints on the photopion amplitude. The $E2/M1$ mixing ratio for $N\ensuremath{\rightarrow}\ensuremath{\Delta}$...
We report an extensive high-sensitivity search for axion dark matter above 1 GHz at the Center Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting coupling between axions photons, explored frequency (mass) range of 1.025 (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>4.24</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi mathvariant="normal">μ</a:mi><a:mi>eV</a:mi></a:mrow></a:math>) to 1.185 (<d:math...
We report new high-precision measurements of $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},\ensuremath{\gamma}),$ $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},{\ensuremath{\pi}}^{0})$ and $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},{\ensuremath{\pi}}^{+})$ cross section beam asymmetry angular distributions for photon energies in the range from 213 MeV to 333 MeV. The sections all three channels are locked together with a small common systematic...
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching via their back conversion to x-ray photons in 9-T 10-m long magnet directed toward Sun. We report on an extended run with International Observatory pathfinder detector, doubling previous exposure time. detector was operated xenon-based gas mixture part of new run, providing technical insights future configurations. No counts...
The axion, a consequence of the PQ mechanism, has been considered as most elegant solution to strong-CP problem and compelling candidate for cold dark matter. Center Axion Precision Physics Research (CAPP) Institute Basic Science (IBS) was established on 16 October 2013 with main objective launch state art axion experiments in South Korea. Relying haloscope technique, our strategy is run several parallel explore wide range masses sensitivities better than QCD models. We utilize not only...
Results from three independent measurements of the p(\ensuremath{\gamma}\ensuremath{\rightarrow},${\mathrm{\ensuremath{\pi}}}^{0}$) reaction are presented for incident photon energies between 243 and 314 MeV, c.m. angles 105\ifmmode^\circ\else\textdegree\fi{}, 122\ifmmode^\circ\else\textdegree\fi{}, 150\ifmmode^\circ\else\textdegree\fi{}. The ratio cross sections measured with orthogonal states linear polarization is sensitive to E2 excitation \ensuremath{\Delta} resonace. Comparisons made...
We report new measurements of inclusive π production from frozen-spin HD for polarized photon beams covering the Δ(1232) resonance. These provide data simultaneously on both H and D with nearly complete angular distributions spin-difference cross sections entering Gerasimov-Drell-Hearn (GDH) sum rule. Recent results Mainz Bonn exceed GDH prediction proton by 22 μb, suggesting as yet unmeasured high-energy components. Our π0 reveal a different dependence than assumed in analyses integrate to...
We report on a first measurement with sensitive opto-mechanical force sensor designed for the direct detection of coupling real chameleons to matter. These dark energy candidates could be produced in Sun and stream unimpeded Earth. The KWISP detector installed CAST axion search experiment at CERN looks tiny displacements thin membrane caused by mechanical effect solar chameleons. are detected Michelson interferometer homodyne readout scheme. benefits from focusing action ABRIXAS X-ray...
New precision measurements of cross sections and polarization asymmetries in the $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},\ensuremath{\gamma}p)$ reaction at 90\ifmmode^\circ\else\textdegree\fi{} c.m. are presented for incident energies between 213 333 MeV. A long-standing problem with earlier experiments that appeared to violate unitarity peak \ensuremath{\Delta} is resolved. Data compared theories based on baryon resonance structure dispersion relations. Recent...
We report an extensive high-sensitivity search for axion dark matter above 1\,GHz at the Center Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting coupling between axions photons, explored frequency (mass) range of 1.025\,GHz (4.24\,$\mu$eV) to 1.185\,GHz (4.91\,$\mu$eV). have introduced a number innovations in this field, demonstrating practical approach optimizing all relevant parameters haloscopes, extending presently available technology. CAPP 12\,T...
New precision angular distribution data for the D(\ensuremath{\gamma},p)n reaction are presented incident photon energies of 191 and 222 MeV. The difference cross sections measured with orthogonal states linear polarization is sensitive to short-range behavior tensor interaction in models nuclear force. Comparisons Bonn Paris potentials illustrate sensitivity.
We report on a new search for solar chameleons with the CERN Axion Solar Telescope (CAST). A GridPix detector was used to soft X-ray photons in energy range from 200 eV 10 keV converted chameleons. No signiffcant excess over expected background has been observed data taken 2014 and 2015. set an improved limit chameleon photon coupling, $\beta_\gamma < 5.7\times10^{10}$ $1<\beta_\mathrm{m}<10^6$ at 95% C.L. improving our previous results by factor two first time reaching sensitivity below...
New precision measurements of the $^{2}\mathrm{H}$(\ensuremath{\gamma}\ensuremath{\rightarrow},p)n reaction taken with tagged polarized photons, and covering a wide angular range, are presented for incident energies between 113 315 MeV. In region \ensuremath{\Delta} resonance, photodisintegration observables can potentially be used to probe N\ensuremath{\Delta} interaction. Coupled-channel calculations in agreement cross sections measured linear polarization parallel plane but fail account...
The first measurement of the reaction He3(γ→,p)X using linearly polarized photons is reported. Cross sections and beam-polarization asymmetries for θplab=60°–100° Eγ=195–304 MeV are compared with a microscopic calculation which includes one-, two-, three-nucleon absorption mechanisms. One- two-nucleon alone fails to describe data at low proton momenta. inclusion significantly improves comparison measured cross sections. However, some features asymmetry distributions not explained.Received 9...
It has been previously advocated that the presence of daily and annual modulations axion flux on Earth's surface may dramatically change strategy searches. The arguments were based so-called Axion Quark Nugget (AQN) dark matter model which was originally put forward to explain similarity visible cosmological densities $\Omega_{\rm dark}\sim \Omega_{\rm visible}$. In this framework, population galactic axions with mass $ 10^{-6} {\rm eV}\lesssim m_a\lesssim 10^{-3}{\rm eV}$ velocity $\langle...
The photodisintegration of deuterium with linearly polarized light has been measured in the energy range 110--315 MeV. results five independent measurements using three detector systems, two liquid target geometries, and photon distribution end points are presented. These data combined into one average set a systematic uncertainty \ifmmode\pm\else\textpm\fi{}5%. statistical precision this set, coupled sensitivity to strength short tensor interaction observed parallel-perpendicular cross...
Spin asymmetries for the ${}^{16}\mathrm{O}(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},p{\ensuremath{\pi}}^{\ensuremath{-}})$ reaction are reported incident photon energies of 293 $\ifmmode\pm\else\textpm\fi{}$ 20 MeV, proton angles ranging from 28$\ifmmode^\circ\else\textdegree\fi{}$ to 140$\ifmmode^\circ\else\textdegree\fi{}$ (lab), and pion 35$\ifmmode^\circ\else\textdegree\fi{}$ 115$\ifmmode^\circ\else\textdegree\fi{}$. The data compared with calculations in a quasifree...
Coherent X rays can be produced by Compton scattering of laser light on a relativistic electron beam, whose current is periodically modulated the same radiation in suitable miniundulator. If and photon energy are properly matched, beam acts as moving diffraction grating show high degree coherence. A practical implementation this scheme shown.