A5111695089- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Radio Astronomy Observations and Technology
- Radiation Detection and Scintillator Technologies
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Quantum, superfluid, helium dynamics
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Radiation Therapy and Dosimetry
- X-ray Spectroscopy and Fluorescence Analysis
- High-pressure geophysics and materials
- Scientific Research and Discoveries
- Manufacturing Process and Optimization
University of Minnesota
1997-2016
University of Minnesota System
1976-2015
Twin Cities Orthopedics
1981-2005
Fermi National Accelerator Laboratory
1982-2002
Argonne National Laboratory
1978-2000
Rutherford Appleton Laboratory
1991
Syracuse University
1990
University of Rochester
1980-1984
University of Pennsylvania
1983
Columbia University
1978
A deficit of atmospheric ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ events, consistent with the hypothesis neutrino oscillations, is observed in 5.90 kiloton-year fiducial exposure Soudan 2 detector. An unbinned maximum likelihood analysis $L/E$ distribution has been carried out using Feldman-Cousins prescription. The probability no oscillation $5.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ 90% confidence allowed region...
We have observed underground cosmic-ray muons, corresponding to a secondary flux of \ensuremath{\sim}7\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}11}$ ${\mathrm{cm}}^{\ensuremath{-}2}$ ${\mathrm{s}}^{\ensuremath{-}1}$, at depth 1800 m water equivalent, which appear be initiated by Cygnus X-3. This identification is based on both direction and phase coherence. The existence such muons conflicts with the current understanding photon cascades and/or nature location
We have used the polarized proton beam at Argonne zero-gradient synchrotron to measure left-right asymmetries in processes ${p}_{\mathrm{pol}}+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}\ifmmode\pm\else\textpm\fi{}X$ ${p}_{0}=6 \mathrm{and} 11.8$ Gev/c and $x\ensuremath{\equiv}\frac{{{p}_{l}}^{*}}{{p}_{max}}=0.1 \mathrm{to} 0.9$. For both pion charges, show considerable but different structure $u$, square of four-momentum transfer between incident outgoing...
Upward-going stopping muons initiated by atmospheric νμ and ν¯μ interactions in the rock below Soudan 2 detector have been isolated, together with a companion sample of neutrino-induced single muons, created within detector, which travel downwards exit. The downward-going is consistent atmospheric-neutrino flux prediction, but upward-going exhibits sizable depletion. Both are previously reported neutrino-oscillation results. Inclusion two samples an all-event likelihood analysis, using...
Using data on the coherent production of ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ systems in ${\ensuremath{\pi}}^{+}$ collisions with nuclei, we have extracted an estimate for radiative partial width ${A}_{1}$. The rate ${{A}_{1}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\gamma}$ is 640\ifmmode\pm\else\textpm\fi{}246 keV, which a factor about 2-3 below value expected basis predictions from quark models and vector dominance ideas.
The excitation of high-energy pions in the nuclear Coulomb field has been investigated. data, analyzed assuming presence both electromagnetic and strong contributions to coherent production ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ systems, yield a decay width for ${\ensuremath{\rho}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$ 67\ifmmode\pm\else\textpm\fi{}7 keV.
We have measured the left-right asymmetry for inclusive production of ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, and protons in proton-proton proton-deuteron collisions at 11.75 GeV/c. The measurements, utilizing polarized proton beam Argonne zero-gradient synchrotron, cover a wide range kinematic variables [$u$ between 0.6 -1.5 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ $x$ 0.1 0.9 meson production, $t$ -0.2 -2.0 -0.25 0.75...
We have searched for neutron-antineutron oscillations using the 5.56 fiducial kiloton-year exposure of Soudan 2 iron tracking calorimeter. require candidate nn̄ occurrences to >~4 prongs (tracks and showers) kinematics compatible with n̄N annihilation within a nucleus. observe five events, an estimated background from atmospheric neutrino cosmic ray induced events 4.5±1.2 events. Previous experiments smaller exposures observed no candidates, rates similar this experiment. set lifetime lower...
Analysis of underground muon events from the direction Cygnus X-3 shows evidence for large time variability flux in addition to 4.8-h modulation. Our data support earlier suggestions that high fluxes occur with a 34.1-d cycle. Events measured during high-rate periods show increased statistical hypothesis linking muons this x-ray binary.
Measurements of the tensor and vector spin observables C(0,NN,0,0), C(0,SS,0,0), C(0,N,0,0), in p-d elastic scattering at 600, 800, 1000 MeV equivalent proton bombarding energy, are reported. The data were taken range 0.1<-t<1.2 (GeV/c${)}^{2}$. experiment employed a polarized deuteron beam with components \ifmmode\pm\else\textpm\fi{}0.75 \ifmmode\pm\else\textpm\fi{}0.25, respectively, liquid hydrogen target, single arm magnetic spectrometer. parameters C(0,N,0,0) C(0,NN,0,0) extracted from...
The underground Soudan-1 nucleon decay experiment can measure the velocities of slowly moving particles if they be detected by ionization at a level 0.5 times that relativistic muon. Magnetic monopoles predicted grand unified theories should satisfy this condition their are greater than ${10}^{\ensuremath{-}3}c$. During live time 0.41 yr, no candidate has been observed, implying 90%-confidence-level limit on flux such objects 4.1\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$...
The polarization in $p$-$^{4}\mathrm{He}$ elastic scattering has been measured between 0.56 and 1.73 GeV a range of the square four-momentum transfer 0.006 1.2 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. data are characterized by positive maxima at $\ensuremath{-}t$ near 0.08 0.36 At GeV, sharp peak large negative 0.23 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ is observed. This structure persists higher bombarding energies, but no longer becomes increasingly shallower as...
The authors have measured the inclusive production of direct photons in transverse momentum (${p}_{T}$) range 2.1-5.0 GeV/c 200-GeV/c collisions protons and ${\ensuremath{\pi}}^{+}$ mesons on a carbon target. A significant yield was observed for ${p}_{T}>2.5$ GeV/c. invariant cross section direct-photon production, when compared with measurements from CERN intersecting storage rings, can be expressed terms ${p}_{T}$ ${x}_{T}=2{p}_{T}\sqrt{s} \mathrm{as}...
We have measured ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}p$ and $\mathrm{pp}$ elastic differential cross sections in the range $|{cos\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}|<0.35$ for incident momenta from 2 to 9.7 GeV/c ${\ensuremath{\pi}}^{\ensuremath{-}}p$ 6.3 ${\ensuremath{\pi}}^{+}p$. find that fixed-c.m.-angle $\ensuremath{\pi}p$ cannot be described as simple functions of $s$. The data are compared energy angular dependence predicted by constituent model Gunion,...
We have measured the differential cross-section and analyzing power (polarization) for $p$-$^{4}\mathrm{He}$ elastic scattering at incident kinetic energies of 0.56, 0.80, 1.03, 1.24, 1.73 GeV. The experiment used a polarized proton beam on liquid helium target single arm magnetic spectrometer to detect scattering. Both cross sections show structure near $\ensuremath{-}t=0.25$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ which decreases in magnitude with increasing energy. multiple...
New results are presented for the reactions ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{m}^{0}n$ at 3.65 $\frac{\mathrm{GeV}}{c}$, where ${m}^{0}$ represents $\ensuremath{\eta}$ or ${\ensuremath{\eta}}^{\ensuremath{'}}$ decaying to $\ensuremath{\gamma}\ensuremath{\gamma}$. We have seen 31 events over a small background, leading branching ratio...
This study is aimed primarily at evaluating the utility of axis-crossing detectors in tracking speech formants. Detectors usual type are found subject to an error, fundamental nature. To remove this source error modulated up frequency as a single sideband before limiting and detecting processes applied. Experimental results with carrier detector on small number samples presented, compared spectrograms. Conclusions that average rates cannot be trusted general follow specific formants, whether...
We present data on coherent ${\ensuremath{\rho}}^{\ensuremath{-}}$ production nuclear targets and our application of the Primakoff formalism for extracting radiative decay width transition ${\ensuremath{\rho}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$. Assuming presence both electromagnetic strong contributions to production, we obtain...
Deep underground muon events recorded by the Soudan 2 detector, located at a depth of 2100 m water equivalent, have been used to infer nuclear composition cosmic rays in ``knee'' region ray energy spectrum. The observed multiplicity distribution favors model with substantial proton content $8\ifmmode\times\else\texttimes\fi{}{10}^{5}$--$1.3\ifmmode\times\else\texttimes\fi{}{10}^{7}$ GeV/nucleus.
A comprehensive measurement of the differential cross section for ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}p$ and $\mathrm{pp}$ elastic scattering has been made at large center-of-mass angles. ${\ensuremath{\pi}}^{\ensuremath{-}}p$ were measured with incident laboratory momenta ranging from 2 to 9.5 GeV/c. ${\ensuremath{\pi}}^{+}p$ was 6.3 Scattering angles in range $\ensuremath{-}0.3\ensuremath{\lesssim}{cos\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}\ensuremath{\lesssim}0.4$. The...
The large-angle analyzing power $A$ in proton-neutron elastic scattering at 2, 3, and 6 GeV/c with use of the polarized proton beam Argonne zero-gradient synchrotron a liquid deuterium target have been measured. measurements, first high energy, show that is large (20-40%) negative over much angular range shows no decrease incident unlike earlier data smaller angles.
We have used a polarized proton beam to measure the analyzing power for $\mathrm{pd}$ backward elastic scattering at incident kinetic energies of 0.68, 1.03, and 1.53 GeV reaction $p+p\ensuremath{\rightarrow}d+\ensuremath{\pi}$ 1.03 GeV. The data indicate that several mechanisms dominate over this energy range.