M. Johnson
A5024807354- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Black Holes and Theoretical Physics
- CCD and CMOS Imaging Sensors
- Distributed and Parallel Computing Systems
- Advancements in Semiconductor Devices and Circuit Design
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Superconducting Materials and Applications
- Parallel Computing and Optimization Techniques
- Gamma-ray bursts and supernovae
- Radiation Effects in Electronics
- Advanced Data Storage Technologies
- Muon and positron interactions and applications
Fermi National Accelerator Laboratory
2016-2025
Purdue University West Lafayette
2025
Institute of High Energy Physics
2011-2024
A. Alikhanyan National Laboratory
2022-2024
Scripps Institution of Oceanography
2024
University of Antwerp
2024
Mayo Clinic in Florida
2024
Mayo Clinic
2024
University of Nebraska–Lincoln
2023
St. Thomas University
2022
This paper describes the design and construction of MicroBooNE liquid argon time projection chamber associated systems. is first phase Short Baseline Neutrino program, located at Fermilab, will utilize capabilities detectors to examine a rich assortment physics topics. In this document details specifications, assembly procedures, acceptance tests are reported.
We have observed six trimuon events produced by neutrinos in the new large-angle neutrino detector (NEULAND) at Fermilab with momenta and charges of almost all muons determined. The properties these strongly suggest that their origin is not hadronic but may be lepton sector.
The characteristics of six trimuon events observed in the new large-angle neutrino detector at Fermilab are described. leptonic system appears to take an inordinate fraction incident energy if hadrons presumed be origin these events. A similar effect seems present dimuon previously observed. find a natural interpretation as products cascade decay lepton (the $M$ particle) through lower-mass neutral ${L}^{0}$ particle).
We present results from a high precision experimental study of the nuclear modification longitudinal ($F_L$) to transverse ($F_1$) structure function ratio for bound nucleons in resonance region. The inclusive electron scattering cross sections were measured Jefferson Lab Experimental Hall C on carbon and deuterium nuclei large range kinematics, allowing separations functions be performed at four-momentum transfer values $0.5 \le Q^2 \le$ 3.75~GeV$^2$. In contrast significant body...
Although hemoplasma infection has been widely described in animals, a few studies have conducted involving human populations, mostly as case reports. This was cross-sectional epidemiological study that accessed individuals and dogs from ten Indigenous communities of southern southeastern Brazil. A total 23/644 (3.6%) tested positive to hemoplasmas by quantitative polymerase chain reaction (qPCR) (cycle threshold; Ct ≤ 34.4), with 3/644 (0.5%) Mycoplasma haemocanis detection. In addition,...
Measured energy-dependent rates of opposite-sign dimuons produced by neutrinos and antineutrinos are presented used to determine the fraction strange quarks. Experimental distributions compared with those expected from charm production decay.
We have observed six additional trimuons in a neutrino beam and one trimuon an antineutrino using the new large-angle detector (NEULAND) at Fermilab. One of events has three very high-energy muons. The properties together with earlier suggest least two qualitatively different origins for this phenomenon.
We report the observation of 46 ${\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\mu}}^{\ensuremath{-}}$ events in high-energy neutrino-nucleon collisions at Fermilab. Measurement production rate relative to that ${\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}$ targets different hadronic absorption lengths give...
Short-lived particles produced in association with muons have been observed the interactions of 350-GeV/c protons neon a high-resolution streamer chamber. The characteristics these events are consistent expected properties charmed if average lifetime lies between ${10}^{\ensuremath{-}13}$ and 2\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}12}$ sec. With assumption that mainly ${D}^{\ifmmode\pm\else\textpm\fi{}}$ mesons lifetimes approximately ${10}^{\ensuremath{-}12}$ sec,...
We present data on the production by neutrinos of a prompt ${\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\mu}}^{\ensuremath{-}}$ signal with rate relative to ${\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}$ (single charm production) 0.07\ifmmode\pm\else\textpm\fi{}0.04, 0.12\ifmmode\pm\else\textpm\fi{}0.03, and 0.12\ifmmode\pm\else\textpm\fi{}0.03 for ${p}_{\ensuremath{\mu}}>5, >10,\mathrm{and}>15$ GeV/c, respectively. The energy dependence ratio...
SVX4 is the new silicon strip readout IC designed to meet increased radiation tolerance requirements for Run IIb at Tevatron collider. Devices have been fabricated, tested, and approved production. The design a technology migration of SVX3D currently in use by CDF. Whereas was fabricated 0.8-/spl mu/m radiation-hard process, standard 0.25-/spl mixed-signal CMOS using "radiation tolerant design" transistor topologies devised CERN RD49 collaboration. specific cell layouts include digital cells...
This paper presents the final results on charged-current neutrino and antineutrino interactions with nuclei from experiment E-310 at Fermi National Accelerator Laboratory. The data sample, consisting of 21 578 neutrino-induced 7358 antineutrino-induced events within fiducial region in energy range $20<E<325$ GeV, is exhibited first to demonstrate basic properties kinematic regions represented. dependence nucleon structure functions dimensionless variable $x$ then described. Lastly,...
The second workshop to discuss the development of liquid argon time projection chambers (LArTPCs) in United States was held at Fermilab on July 8-9, 2014. organized under auspices Coordinating Panel for Advanced Detectors, a body that initiated by American Physical Society Division Particles and Fields. All presentations were made six topical plenary sessions: $i)$ Argon Purity Cryogenics, $ii)$ TPC High Voltage, $iii)$ Electronics, Data Acquisition Triggering, $iv)$ Scintillation Light...
An inductively resonated balanced stripline pickup has been constructed for observing tune spectra. The device is a sensitive betatron oscillation and Schottky noise pickup, providing 25-dB gain over untuned detectors of like geometry. electrodes are motorized, allowing remote adjustment the center aperture. To resonator onto 21.4-MHz operating frequency, motorized capacitor employed. Quadrature signals from pair have enabled observation individual proton antiproton coherent motions to...
Measurements of the $x$ distributions from inclusive ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ (${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$) reactions are interpreted in quark-parton model to yield absolutely normalized momentum valence and sea quarks nucleon. The exhibit a small but significant dependence on energy. From $y$ we also determine value $R=[\frac{\ensuremath{\int}2x{F}_{1}(x)\mathrm{dx}}{\ensuremath{\int}{F}_{2}(x)\mathrm{dx}}]\ensuremath{-}1$, averaged over energy interval...
An overview of the system architecture and algorithms used for DO Central Track Trigger (CTT) in Run 2 Fermilab Tevatron Proton-Antiproton Collider is presented. This uses information from newly commissioned Fiber Tracker Preshower Detectors to generate Level 1 trigger decisions. It also generates lists seed tracks preshower clusters that are sent Muon Trigger, L2 Silicon Forward preprocessors. The consists modular boards which utilize field-programmable gate arrays (FPGAs) implement...
Analysis of 5180 $\overline{\ensuremath{\nu}}$ interactions shows a variation with energy the inelasticity ($y$) distributions over range 10 to 220 GeV and dependence on scaling variable $x$. From these data are obtained approximate $x$ sea quarks limit strength right-handed coupling between $u$ quark massive $b$ quark.