A5047246418- Particle physics theoretical and experimental studies
- Metal Alloys Wear and Properties
- Mechanical stress and fatigue analysis
- High-Energy Particle Collisions Research
- Microstructure and Mechanical Properties of Steels
- Railway Engineering and Dynamics
- Particle Accelerators and Free-Electron Lasers
- Muon and positron interactions and applications
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Advanced X-ray Imaging Techniques
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Additive Manufacturing Materials and Processes
- Noncommutative and Quantum Gravity Theories
- Computational Physics and Python Applications
- High Entropy Alloys Studies
- Neutrino Physics Research
- Additive Manufacturing and 3D Printing Technologies
- Crystallography and Radiation Phenomena
- Radiation Detection and Scintillator Technologies
- Laser Design and Applications
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
Karlstad University
2021-2024
Chalmers University of Technology
2014-2022
National Centre of Scientific Research "Demokritos"
2018-2021
Brookhaven National Laboratory
2000-2009
RIKEN BNL Research Center
2008
Yale University
2003
Boston University
2002
Aristotle University of Thessaloniki
1999
We present the final report from a series of precision measurements muon anomalous magnetic moment, ${a}_{\ensuremath{\mu}}=(g\ensuremath{-}2)/2$. The details experimental method, apparatus, data taking, and analysis are summarized. Data obtained at Brookhaven National Laboratory, using nearly equal samples positive negative muons, were used to deduce ${a}_{\ensuremath{\mu}}(\mathrm{\text{Expt}})=11659208.0(5.4)(3.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$, where...
The anomalous magnetic moment of the negative muon has been measured to a precision 0.7 ppm (ppm) at Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in 2001, and over an order magnitude more precise than previous measurement for muon. a(mu(-))=11 659 214(8)(3) x 10(-10) (0.7 ppm), where first uncertainty statistical second systematic, consistent with measurements anomaly positive average a(mu)(exp)=11 208(6) (0.5 ppm).
A precise measurement of the anomalous g value, a(mu) = (g-2)/2, for positive muon has been made at Brookhaven Alternating Gradient Synchrotron. The result a(mu+) 11 659 202(14) (6) x 10(-10) (1.3 ppm) is in good agreement with previous measurements and an error one third that combined data. current theoretical value from standard model a(mu)(SM) 159.6(6.7) (0.57 a(mu)(exp) - 43(16) which world average experimental value.
Three independent searches for an electric dipole moment (EDM) of the positive and negative muons have been performed, using spin precession data from muon g-2 storage ring at Brookhaven National Laboratory. Details on experimental apparatus three analyses are presented. Since individual results muon, as well combined result, d=-0.1(0.9)E-19 e-cm, all consistent with zero, we set a new EDM limit, |d| < 1.9E-19 e-cm (95% C.L.). This represents factor 5 improvement over previous best limit EDM.
A higher precision measurement of the anomalous g value, a(mu)=(g-2)/2, for positive muon has been made at Brookhaven Alternating Gradient Synchrotron, based on data collected in year 2000. The result a(mu(+))=11 659 204(7)(5)x10(-10) (0.7 ppm) is good agreement with previous measurements and an error about one-half that combined data. present world average experimental value a(mu)(expt)=11 203(8)x10(-10) ppm).
Received 22 August 2002DOI:https://doi.org/10.1103/PhysRevLett.89.129903©2002 American Physical Society
The spin precession frequency of muons stored in the $(g-2)$ storage ring has been analyzed for evidence Lorentz and CPT violation. Two violation signatures were searched for: a nonzero $\Delta\omega_{a}$ (=$\omega_{a}^{\mu^{+}}-\omega_{a}^{\mu^{-}}$); sidereal variation $\omega_{a}^{\mu^{\pm}}$. No significant effect is found, following limits on standard-model extension parameters are obtained: $b_{Z} =-(1.0 \pm 1.1)\times 10^{-23}$ GeV; $(m_{\mu}d_{Z0}+H_{XY}) = (1.8 6.0 \times 10^{-23})$...
The present study describes the development of a theoretical model for estimating thickness homogeneous surface layers on spherical and irregular shaped powder particles using XPS depth profiling. As opposed to flat surfaces, such an approach substrates specific geometry is not straightforward. One needs consider those geometrical factors associated with experimental setup sample's roughness, which impose angle dependence photoelectrons peak intensity, X‐ray flux ion etch rate over in...
A promising approach for producing parts with outstanding properties in directed energy deposition (DED-LB/M) provides the application of tailored powder mixtures processed by applying situ alloying strategies. In this work, DED-LB/M was used to manufacture multilayer specimens from AISI H11 steel powders enriched carbon nanoparticles (C-np) concentrations 0.1 wt.-% and 0.2 wt.-%. The scientific aim investigate impact C-np on microstructural (particularly retained austenite content (RA-c)...
Pearlitic steels are commonly used for railway rails because they combine good strength and wear properties. During service, the passage of trains results in a large accumulation shear strains surface layer rail, leading to crack initiation. Knowledge material properties this region is therefore important fatigue life prediction. As strain limited thin layer, very gradients can be found. This makes it difficult quantify changes behavior. In study hardness measurements were performed close...
A novel, single shot, nondestructive scheme to measure the bunch length of submillimeter relativistic electron bunches using electro-optical method is described. In this scheme, birefringence induced by electric field electrons converts temporal characteristics a spatial intensity distribution an optical pulse. Electric characteristics, birefringence, and retardation are calculated for few typical beam parameters criteria limiting resolution established.
We have measured the temporal duration of 45 MeV picosecond electron beam bunches using a noninvasive electro-optical (EO) technique. The amplitude EO modulation was found to increase linearly with charge and decrease inversely distance from beam. rise time signal limited by our detection system ∼70 ps. due ionization caused electrons traversing crystal also observed. It has distinctively long decay constant polarity opposite that field induced technique may be ideal for measurement bunch...
Abstract Block braked railway wheels are subjected to thermal and rolling contact loading. The loading results in high temperatures stresses which cause slow time dependent processes such as creep, relaxation static recovery of the wheel material. At same time, implies a very fast mechanical load application. This paper is focused on material modeling pearlitic steel for wide range rates at elevated temperatures. starting point viscoplasticity model including nonlinear isotropic kinematic...
Two signals of CPT/Lorentz violation have been searched for in data collected the muon (9-2) experiment E821 at Brookhaven Lab AGS. Muons 3.1 GeV/c were stored a magnetic storage ring, and their spin precession frequency wa relative to momentum was measured. The difference average frequencies p+ prestricts Standard-Model Extension parameter b Z . non-observation sidereal variation over severalmonth collection period restricts parameters b: *
In this study, the DED-LB/M process of AISI H11 tool steel powder blends modified by adding WC nanoparticles (WC-np) in concentrations 1, 2.5 and 5 wt.-% was object scientific investigations. For this, 30-layer cuboid specimens were manufactured. The overall aim to examine how WC-np interact with melt end, influence processability, microstructure mechanical properties produced specimens. examinations carried out on both as-built thermally post-processed An advanced microstructural analysis...