A5050444326- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Superconducting Materials and Applications
- Inorganic Fluorides and Related Compounds
- Atomic and Molecular Physics
- Gyrotron and Vacuum Electronics Research
- Advanced Chemical Physics Studies
- Radiation Effects and Dosimetry
- X-ray Spectroscopy and Fluorescence Analysis
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Graphite, nuclear technology, radiation studies
- Particle Detector Development and Performance
- Effects of Radiation Exposure
- Rare-earth and actinide compounds
- Astronomical and nuclear sciences
- Advanced Scientific Techniques and Applications
- Neutrino Physics Research
University of Oxford
2021
Thomas Jefferson National Accelerator Facility
2005-2020
Stony Brook School
2006
University of Notre Dame
1991
United States Department of Energy
1990
Princeton University
1960-1985
Utah State University
1980
Lawrence Livermore National Laboratory
1978
Massachusetts Institute of Technology
1967-1975
China National Offshore Oil Corporation (China)
1975
The energy spectra of neutrons produced by 35 and 46 MeV protons, 16 28 deuterons, 44 3 He ions on thick beryllium were measured at angles 0°, 15°, 45° with respect to the incident beams. time‐of‐flight method for from maximum down 1 MeV. Neutron dose rates obtained zero‐degree use available tissue kerma factors agree TE–TE ionization chamber measurements.
Techniques have been developed for the precise measurement of magnetic field shapes both steady-state and time-varying fields. A series measurements was used to refine design Cosmotron magnet examine effects on shape many parts component equipment. Measurements fields made in detail; they indicate a that conforms requirements. show good agreement with model predictions.
Operation of the JLab IR Upgrade FEL at CW powers in excess 10 kW requires sustained production high electron beam by driver ERL. This turn demands attention to numerous issues and effects, including: cathode lifetime; control beamline RF system vacuum during current operation; longitudinal space charge; transverse matching irregular/large volume phase distributions; halo management; management remnant dispersive effects; resistive wall, wake-field, heating chambers; break up instability;...
An intensive study of the behavior proton beam in Cosmotron has been made for period just after injection, before application any accelerating field. The actual orbits have traced small variations energy and time injection order to obtain optimum conditions. These used make further refinements on adjustments some components. required unaccelerated spiral inside wall vacuum chamber is as a basis normal routine.
Tartaric acid crystals illuminated with light from a carbon arc exhibit flow of current when connected to galvanometer without the aid an impressed battery. This actinoelectric effect is greatly dependent upon orientation crystal respect illuminating beam light. It shown that section can be chosen which shows series equi-potential lines its surface examined two probes while illuminated. The measured currents are about ${10}^{\ensuremath{-}12}$ ampere, arc. linear function intensity for lower...
The $^{64}\mathrm{Ni}$($^{4}\mathrm{He}$, $^{8}\mathrm{He}$)$^{60}\mathrm{Ni}$ reaction was used at 58-MeV bombarding energy with the quadrupole-dipole-dipole-dipole spectrograph, giving an improved value of $^{8}\mathrm{He}$ mass excess 31.611\ifmmode\pm\else\textpm\fi{}0.017 MeV.NUCLEAR REACTIONS $^{8}\mathrm{He}$); $E=58$ MeV; measured.
The reaction $^{12}\mathrm{C}(^{16}\mathrm{O},p)^{27}\mathrm{Al}$ has been studied at ${E}_{\mathrm{lab}}(^{16}\mathrm{O})=36 \mathrm{and} 60$ MeV with high resolution. Narrow levels of $^{27}\mathrm{Al}$ are seen in the region ${E}_{x}=13 \mathrm{to} 20$ both measurements, and their locations suggest that is selectively sampling high-spin states yrast line.
The $^{81}\mathrm{Kr}^{m}$ to $^{81}\mathrm{Br}$ electron capture rate has been measured and found have a $log\mathrm{ft}$ value of 4.58\ifmmode\pm\else\textpm\fi{}0.11. This result implies is feasible target for solar neutrino capture.RADIOACTIVITY Measured branching ratio capture, deduced capture.
The production of ${Y}^{0}$ (${\ensuremath{\Lambda}}^{0}, {\ensuremath{\Sigma}}^{0}$), ${\ensuremath{\theta}}^{0}$, ${\ensuremath{\Sigma}}^{\ensuremath{-}}$ particles by 1.5-Bev ${\ensuremath{\pi}}^{\ensuremath{-}}$ mesons has been observed in a multiplate cloud chamber with one-half inch plates C, Fe, and Pb. fraction the inelastic nuclear interactions which result strange particle remains approximately constant from C to Pb, following yields: ${Y}^{0}$, 1.7\ifmmode\pm\else\textpm\fi{}0.4%;...
The 288 blocks that constitute the Cosmotron magnet were tested, individually, to determine their magnetic characteristics. These measurements used arrange in an order would minimize azimuthal harmonics. remanent field was only parameter showed appreciable deviations.
The injection optical system, through which the 3.6-Mev proton beam from Van de Graaff accelerator enters Cosmotron, consists primarily of a deflecting magnet and an electrostatic inflector in is deflected angles 25° 30°, respectively. Viewing detecting mechanisms are available for studies alignment ion optics. properties system have been studied detail; parameters chosen yield injected beam, parallel horizontal plane diverging within angle 0.003 radian vertical plane.
At fields over 10 000 gauss the effects of saturation in Cosmotron magnet cause deterioration field pattern which rapidly becomes serious enough to complete loss proton beam. This can be restored adequately up 14 by passing current through single-layer windings on faces poles. Peak correction required at is about 300 amp per radial inch each winding. The pole-face winding returns are so arranged that almost completely decoupled from main magnetizing and their power supplies place but not yet...
Data obtained by scattering 29.8 MeV protons and 21.7 neutrons from $^{34}\mathrm{S}$ are used in a consistent analysis to obtain values relative signs for proton (${M}_{\mathrm{p}}$) neutron (${M}_{\mathrm{n}}$) multiple matrix elements E2 transitions the first three ${2}^{+}$ states $^{34}\mathrm{S}$. The data ${0}^{+}$(g.s.)\ensuremath{\rightarrow}${2}_{2}^{+}$(3.30 MeV) transition only with assumption of same sign ${M}_{\mathrm{p}}$ ${M}_{\mathrm{n}}$. .AE