A5037420259- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Atomic and Molecular Physics
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Quantum Mechanics and Applications
- Pulsars and Gravitational Waves Research
- Cold Atom Physics and Bose-Einstein Condensates
- High-Energy Particle Collisions Research
- CCD and CMOS Imaging Sensors
- Black Holes and Theoretical Physics
- Quantum Information and Cryptography
- Astro and Planetary Science
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Quantum Mechanics and Non-Hermitian Physics
- Advanced Thermodynamics and Statistical Mechanics
- Space Science and Extraterrestrial Life
- Algebraic and Geometric Analysis
Comisión Nacional de Energía Atómica
1984-1999
Campbell Collaboration
1997
TRIUMF
1991
Forschungszentrum Jülich
1990
Indiana University Bloomington
1983-1985
Results are reported of an experimental search for the unique, rapidly varying temporal pattern solar axions coherently converting into photons via Primakoff effect in a single crystal germanium detector when incident at Bragg angle with crystalline plane. The analysis 1.94 kg yr data from 1 DEMOS Sierra Grande, Argentina, yields new laboratory bound by axion-photon coupling...
We report on new estimates of the modulation expected in semiconductor detectors due to eclipsing dark matter particles Earth. reevaluate theoretical significances and discuss differences found with previous calculations. find that a significantly larger statistics than previously estimated is needed achieve same level sensitivity modulated signal.
In this paper, we invoke the formalism used previously by Krajcik and Foldy to obtain relativistic center-of-mass coordinates for a system of pointlike Dirac particles. This procedure allows us investigate recent dispute regarding size, as well proper formulation, recoil corrections baryon magnetic moments in bag model. Our results suggest that overall center-of-mass-system motion, when factored out properly yield momentum-conservation \ensuremath{\delta} functions, does not result...
We calculate the magnetic moments of several hypernuclei using \ensuremath{\sigma}-\ensuremath{\omega} model with addition a tensor term to describe \ensuremath{\omega}-\ensuremath{\Lambda} coupling. find that this change in \ensuremath{\Lambda} coupling induces modification structure hyperon sector baryonic current and has implications on backflow for finite nuclei. It manifests itself more dramatically those cases where is sitting s states which are precisely likely be measured...
The authors discuss two-component reductions of Dirac phenomenology. presence strong single-particle potentials results in effective transition operators the space that are qualitatively different from those occur conventional Schrodinger
We have measured the internal bremsstrahlung spectrum of electron capture decay $^{71}\mathrm{Ge}$ in search for a possible mass component emitted neutrino. The main relevance this experiment is given by collected statistics which 20 times larger than previously published work studying same decay. Analyses data exclude presence massive 17.${2}_{\mathrm{\ensuremath{-}}1.1}^{+1.3}$ keV and (1.6\ifmmode\pm\else\textpm\fi{}0.7)% mixing fraction claimed Zlimen et al. nucleus, at 99.0% confidence level.
Simple total-energy considerations allow an explanation for the nuclear surface transparency in heavy-ion elastic scattering and hence a prediction of reactions that present strong backward rise angular distributions.
We invoke the formalism developed by Krajcik and Foldy to consistently treat recoil effects in relativistically corrected impulse approximation presence of a local central potential. It is stressed that case single-particle Dirac Hamiltonian are considerably different from those suitable for Foldy-Wouthuysen diagonalized Hamiltonian. also found that, Hamiltonian, intuitive arguments may result an incorrect sign certain terms as preceding paper. As illustrative numerical example, we use...
We present a calculation of first-forbidden \ensuremath{\beta}-decay transitions in the lead region using relativistic mean-field and Hartree approximations to quantum hydrodynamic model Serot Walecka. A formalism for response core valence particle or hole case weak is developed studied \ensuremath{\pi}- \ensuremath{\rho}-meson fields model. Two applications are shown which results show sizable enhancement matrix element. This partly quenched by inclusion vacuum corrections. The these cases...