A5005902437- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Nuclear Materials and Properties
- Astro and Planetary Science
- Nuclear and radioactivity studies
- Graphite, nuclear technology, radiation studies
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Radioactive contamination and transfer
- Astronomical Observations and Instrumentation
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Optical Polarization and Ellipsometry
- Radio Astronomy Observations and Technology
- Scientific Measurement and Uncertainty Evaluation
- Mineral Processing and Grinding
- Radiation Therapy and Dosimetry
Lawrence Livermore National Laboratory
2011-2023
University of California, Berkeley
2005
University of Hawaii System
1997
Centre National de la Recherche Scientifique
1997
University of Colorado Boulder
1992-1997
Canada–France–Hawaii Telescope
1997
University of Hawaiʻi at Mānoa
1997
University of Colorado System
1991-1992
Siemens (Germany)
1988
view Abstract Citations (125) References (136) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Canada-France-Hawaii Telescope Imaging Survey of BL Lacertae Objects. I. Properties the Host Galaxies Wurtz, Ron ; Stocke, John T. Yee, H. K. C. results an extensive imaging survey 50 Lac objects conducted at 3.6 m (CFHT) are presented. This paper details pertinent to host galaxies objects; a companion presents on clustering environments obtained from same...
The results of an extensive imaging survey BL Lac objects conducted at the Canada-France-Hawaii 3.6 m Telescope (CFHT) are presented. This paper details pertinent to clustering environments Lacs; a companion (Wurtz, Stocke, & Yee) presented on host galaxies Lacs obtained from same Gunn r-band images.
view Abstract Citations (58) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The BL Lacertae Object PKS 1413+135: Is It within or behind a Spiral Galaxy? Stocke, John T. ; Wurtz, Ron Wang, Qingde Elston, Richard Jannuzi, Buell New observations of the very red quasar Lac object 1413 + 135 are presented. Optical imaging and spectroscopy confirm claim that host galaxy to this is spiral, H-band shows point source centered in 0.1". A reanalysis...
For many years, LLNL researchers have been developing time‐correlated neutron detection techniques and algorithms for applications such as Arms Control, Threat Detection Nuclear Material Assay. Many of the developed specifically relatively low efficiency (a few percent) attainable by detector systems limited to man‐portability. Historically, thermal detectors (mainly 3He) were used, taking advantage high interaction cross sections. More recently, we investigating use fast with liquid...
Abstract Pulse shape discrimination (PSD) is the task of classifying electronic pulse shapes for different particle types such as gamma rays and fast neutrons interacting in scintillators read out by photo sensitive detectors. This field has been limited its adoption techniques found statistical learning community. Methods initially employed 1960s analog circuitry persist current PSD literature describing operations performed on digitized pulses, which are amenable to rigor. Despite vast...
For material spontaneously generating fission chains, the arrival times of neutron and gamma-ray counts create a clustering pattern distinctly different from random source. A theory for time interval distribution between is given. As well as nearest-neighbor counts, we give general distributions all n’th-neighbor intervals. The sum these gives Rossi correlation function. This supplies direct link experimentally measured quantities
For many years at LLNL, we have been developing time-correlated neutron detection techniques and algorithms for applications such as Arms Control, Threat Detection Nuclear Material Assay. Many of our developed specifically the relatively low efficiency (a few percent) inherent in man-portable systems. Historically, thermal detectors (mainly 3 He ) were used, taking advantage high interaction cross-sections, but more recently investigating use fast with liquid scintillators, inorganic...
Oak Ridge National Laboratory is developing a portable, pixelated fast-neutron imaging panel for associated particle (API). The consists of new and commercially available hardware. Unlike the current generation API-based neutron systems, this intended to be field deployable. A <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$30\times30$ </tex-math></inline-formula> array optically isolated 1 cm...
We present a long-term multiwavelength light curve of Galactic black hole candidate GRS 1758-258 by combining previously published and archival data from Granat, ROSAT, the Compton Gamma Ray Observatory, Rossi X-Ray Timing Explorer, BeppoSAX, ASCA, EXOSAT, Very Large Array. In addition, we include first spectral results balloon-borne Gamma-Ray Arcminute Telescope Imaging System (GRATIS). divergent analyses 1991-1993 ROSAT observations, have reanalyzed these data; find that soft X-rays track...
LOTIS is a gamma-ray burst optical counterpart search experiment located near Lawrence Livermore National Laboratory in California. Since operations began 1996 October, has responded to five triggers as of 1997 July 30, which occurred during good weather conditions.
To reach maximum sensitivity, any method used to search for orphan sources must be insensitive local variations of the background. Using imaging and non-imaging techniques, we analyzed same data acquired by a large-area, coded-mask-imager instrument. Data from many passes past 1 mCi source at 65 m instrument were construct model response. We then "hide" in taken light urban environment. compared success detecting hidden using coded-mask methods, pseudo-imaging based on zero-area matched...
Optical CCD imaging at the position of a bright x-ray point source just off visible disk nearby irregular galaxy M82 constrain it to be an binary with 0.2-4 keV luminosity => 9 X 10^38^ ergs/s. Assuming that emission is due single object, then by assuming Eddington limit appropriate for pure electron scattering this requires minimum primary mass 15 M_sun_; thus, black hole candidate. If brightest optical object detected inside error circle B~22.2 secondary emitter, most likely early type...
The 0.6‐m Super‐LOTIS (Livermore Optical Transient Imaging System) telescope is a fully robotic system dedicated to the search for prompt optical emission from gamma‐ray bursts. began routine operations its Steward Observatory site atop Kitt Peak in April 2000. We summarize current capabilities of and present some recent scientific results. A progress report given on upgrade allow simultaneous near‐infrared (NIR) imaging. This will be completed coincide with launch Swift GRB explorer mission...