61 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Neutral Particles"  
Results: 1 - 24 next
open access

Neutral particle beam distributed data acquisition system

Description: A distributed data acquisition system has been designed to support experiments at the Argonne Neutral Particle Beam Accelerator. The system uses a host VAXstation II/GPX computer acting as an experimenter's station linked via Ethernet with multiple MicroVAX IIs and rtVAXs dedicated to acquiring data and controlling hardware at remote sites. This paper describes the hardware design of the system, the applications support software on the host and target computers, and the real-time performance.
Date: January 1, 1987
Creator: Daly, R.T.; Kraimer, M.R. & Novick, A.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

''Econodump'' design for the Fermilab Direct Neutral Lepton Facility

Description: An extensive effort has been directed toward a major redesign of the Fermilab Direct Neutral Lepton Facility (DNLF). The goal has been a very significant cost reduction of the facility, with minimal sacrifice of physics potential. Hence the name ''Econodump'' applied to the redesign effort.
Date: August 1, 1986
Creator: Childress, S.; Brown, C.; Koizumi, G.; Malensek, A.; Morfin, J.G.; Murphy, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Possibility of New Particle Production in Heavy-Ion Collisions

Description: Two-body decay of a particle is hypothesized in order to explain the lack of strong Z dependence of positron emission spectra in low-energy heavy ion collisions. The consequences of such a hypothesis are discussed, as well as recent theoretical and experimental work motivated by it. 50 refs. (LEW)
Date: January 1, 1986
Creator: Balantekin, A. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Search for New Particles with Lifetime 10**(-12) - 10**(-14) sec in Interactions of Protons with Nucleons and Nuclei in Emulsion at 400-GeV/c

Description: A stack of nuclear emulsions was irradiated by 400 Gev/c protons at FNAL. In this work a search for the short-lived particles has been carried out by a new method that allowed to detect secondary events (including the narrow ones) on short distances from the parent star. By measuring angles, momenta and ionizations of the secondary particles they could identify electrons and distinguish them from hadrons. In search for the decays of charged of particles on n{sub s} {ge} 3 charged relativistic p… more
Date: June 1, 1978
Creator: Chernyavsky, M. M.; Komar, A. A.; Orlova, G. I.; Salmanova, N. A. & Tretyakova, M. I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Studies in High Current Density Ion Sources for Heavy Ion FusionApplications

Description: This dissertation develops diverse research on small (diameter {approx} few mm), high current density (J {approx} several tens of mA/cm{sup 2}) heavy ion sources. The research has been developed in the context of a programmatic interest within the Heavy Ion Fusion (HIF) Program to explore alternative architectures in the beam injection systems that use the merging of small, bright beams. An ion gun was designed and built for these experiments. Results of average current density yield (<J>… more
Date: June 1, 2002
Creator: Chacon-Golcher, E.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

E/sub T//sup 0/ and. pi. /sup 0/ spectra from. cap alpha cap alpha. , dd, and pp interactions at. sqrt. s/sub NN/ = 31 GeV at the CERN ISR

Description: A review is given of E/sub T//sup 0/ and neutral pion spectra from various interactions. Inclusive single particle production at large transverse momentum from heavy nuclear targets at Fermilab and at ISR are briefly discussed, followed by some results of measurement of transverse energy emission in the central region of pA collisions. An experiment at ISR is described in which the total neutral energy emitted in the central region was measured using an electromagnetic shower counter which dete… more
Date: June 1, 1984
Creator: Tannenbaum, Michael J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Progress in extending neutral-particle detection down to 10 eV using a Cs heat pipe for electron detachment

Description: Results obtained from experiments to develop a neutral-particle analyzer using a cesium (Cs) heat pipe for electron detachment are described. The Cs heat pipe analyzer, which provides a high conversion efficiency for neutral hydrogen to H/sup -/, is discussed in detail. Also considered are the development of a compact velocity-energy analyzer for determining the energies of impurities escaping from the EBT plasma and the development of an absolute H/sup 0/ detector using secondary negative emis… more
Date: January 1, 1979
Creator: Barnett, C. F. & Ray, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Search for neutral leptons

Description: At present we know of three kinds of neutral leptons: the electron neutrino, the muon neutrino, and the tau neutrino. This paper reviews the search for additional neutral leptons. The method and significance of a search depends upon the model used for the neutral lepton being sought. Some models for the properties and decay modes of proposed neutral leptons are described. Past and present searches are reviewed. The limits obtained by some completed searches are given, and the methods of searche… more
Date: December 1, 1984
Creator: Perl, Martin L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Search for neutral, penetrating, metastable particles produced in the SLAC beam dump

Description: A search was made for neutral objects which might be produced by 20 GeV electrons incident on the SLAC beam dump, penetrate the downstream natural shielding, and decay upstream of an electromagnetic shower calorimeter. With about 30 coulombs of electrons dumped, no candidate events were found above an energy of approx. 2 GeV. Preliminary analysis implies the 95% confidence level limit on the product of mass and lifetime of light axion-like bosons decaying primarily into two photons to be greate… more
Date: March 1, 1984
Creator: Bjorken, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Theory of contributon transport

Description: A general discussion of the physics of contributon transport is presented. To facilitate this discussion, a Boltzmann-like transport equation for contributons is obtained, and special contributon cross sections are defined. However, the main goal of this study is to identify contributon transport equations and investigate possible deterministic solution techniques. Four approaches to the deterministic solution of the contributon transport problem are investigated. These approaches are an attemp… more
Date: October 1, 1980
Creator: Painter, J. W.; Gerstl, S. A. W. & Pomraning, G. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Neutrino counting in e/sup +/e/sup -/ annihilation

Description: The physics that can be learned from studies of e/sup +/e/sup -/ ..-->.. ..gamma.. + weakly interacting particles is examined. It is shown that the physics probed by this reaction depends greatly upon the energy at which experiments are done. The experimental techniques used for these studies are emphasized, particularly the central problem of electromagnetic calorimetry. The present status of knowledge of single-photon production is presented, with a detailed look at the ASP experiment at PEP … more
Date: March 1, 1987
Creator: Burke, D.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Advances in low energy neutral atom imaging techniques

Description: Recently proposed low energy neutral atom (LENA) imaging techniques use a collisional process to convert the low energy neutrals into ions before detection. At low energies, collisional processes limit the angular resolution and conversion efficiencies of these devices. However, if the intense ultraviolet light background can be suppressed, direct LENA detection is possible. We present results from a series of experiments designed to develop a novel filtering structure based on free-standing tr… more
Date: January 1, 1993
Creator: Scime, E. E.; Funsten, H. O.; McComas, D. J.; Moore, K.R. (Los Alamos National Lab., NM (United States)) & Gruntman, M. (University of Southern California, Los Angeles, CA (United States). Space Sciences Center)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Detection of cold gas releases in space via low energy neutral atom imaging

Description: Low energy neutral atoms (LENAs) are produced in space plasmas by charge exchange between the ambient magnetospheric plasma ions and cold neutral atoms. Under normal conditions these cold neutrals come from the terrestrial geocorona, a shroud of few-ev hydrogen atoms surrounding the Earth. As a consequence of this charge exchange, it has become possible to remotely image many regions of the magnetosphere for the first time utilizing recently developed LENA imaging technology. In addition to the… more
Date: January 1, 1993
Creator: McComas, D. J.; Funsten, H. O.; Moore, K. R.; Scime, E. E. & Thomsen, M. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Trapping of antiprotons -- a first step on the way to antihydrogen

Description: A first step towards producing and effectively utilizing antihydrogen atoms consists of trapping antiprotons. The immediate next step must then be to control, i.e. trap the produced antihydrogen. The current state of the art in trapping antiprotons and positrons is reviewed, and the challenges in trapping the resulting neutral particles are discussed.
Date: July 1, 1993
Creator: Holzscheiter, M. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Advances in low energy neutral atom imaging techniques

Description: Recently proposed low energy neutral atom (LENA) imaging techniques use a collisional process to convert the low energy neutrals into ions before detection. At low energies, collisional processes limit the angular resolution and conversion efficiencies of these devices. However, if the intense ultraviolet light background can be suppressed, direct LENA detection is possible. We present results from a series of experiments designed to develop a novel filtering structure based on free-standing tr… more
Date: May 1, 1993
Creator: Scime, E. E.; Funsten, H. O.; McComas, D. J.; Moore, K. R. & Gruntman, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Instrumentation for the absorbers in the low Beta* Insertions of the LHC

Description: Concepts are examined for the measurement of luminosity, beam-beam separation and transverse beam shape and size using the high flux of forward neutral particles produced at the low {beta}* (high luminosity) interaction points (IP's) of the LHC. At design luminosity 10{sup 34} cm{sup -2}sec{sup -1} the flux of neutrals striking the neutral beam absorbers (TAN) in front of the D2 beam separation dipoles is high enough ({approx} 8 neutrons per bunch crossing with mean energy 2.3 TeV) to allow mea… more
Date: August 1, 1998
Creator: Turner, W.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Low energy neutral atoms in the earth`s magnetosphere: Modeling

Description: Detection of low energy neutral atoms (LENAs) produced by the interaction of the Earth`s geocorona with ambient space plasma has been proposed as a technique to obtain global information about the magnetosphere. Recent instrumentation advances reported previously and in these proceedings provide an opportunity for detecting LENAs in the energy range of <1 keV to {approximately}50 keV. In this paper, we present results from a numerical model which calculates line of sight LENA fluxes expected at… more
Date: June 1, 1992
Creator: Moore, K. R.; McComas, D. J.; Funsten, H. O. & Thomsen, M. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Diffusion of alkali species in porous tungsten substrates used in contact ionization sources

Description: Contact ionization (doped) sources used in current Heavy Ion Fusion experiments consist of a porous tungsten substrate doped with an alkali carbonate. In the early stages of the heating cycle (T - 600 C), the carbonate breaks down and releases the alkali atoms that then diffuse through the substrate. At the emitter surface there is a balance between the fast desorption rate of the alkali atoms (mostly as neutrals) and the slower replenishment rate from the substrate by diffusion. Time-resolved … more
Date: January 1, 2002
Creator: Chacon-Golcher, E. (Edwin); Kwan, J. (Joe) & Morse, E. C. (Edward C.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement of Neutrino-Nucleon Neutral-Current Elastic Scattering Cross-section at SciBooNE

Description: In this thesis, results of neutrino-nucleon neutral current (NC) elastic scattering analysis are presented. Neutrinos interact with other particles only with weak force. Measurement of cross-section for neutrino-nucleon reactions at various neutrino energy are important for the study of nucleon structure. It also provides data to be used for beam flux monitor in neutrino oscillation experiments. The cross-section for neutrino-nucleon NC elastic scattering contains the axial vector form factor G… more
Date: February 1, 2009
Creator: Takei, Hideyuki & Tech., /Tokyo Inst.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

MCNP(TM) Version 5.

Description: The Monte Carlo transport workhorse, MCNP, is undergoing a massive renovation at Los Alamos National Laboratory (LANL) in support of the Eolus Project of the Advanced Simulation and Computing (ASCI) Program. MCNP Version 5 (V5) (expected to be released to RSICC in Spring, 2002) will consist of a major restructuring from FORTRAN-77 (with extensions) to ANSI-standard FORTRAN-90 with support for all of the features available in the present release (MCNP-4C2/4C3). To most users, the look-and-feel o… more
Date: January 1, 2002
Creator: Cox, L. J. (Lawrence J.); Barrett, R. F. (Richard F.); Booth, Thomas Edward; Briesmeister, Judith F.; Brown, F. B. (Forrest B.); Bull, J. S. (Jeffrey S.) et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Study of Electron and UV Photon Surface Interactions. Progress Report, March 1, 1976--February 28, 1977. [Total Cross Sections for Neutral Desorption]

Description: Much additional data were obtained on electron stimulated desorption with the variable parameters of bombarding electron energy (0 to 6.5 keV), substrate material (304 stainless steel, platinum, niobium, etc.), substrate temperature (25 to 450/sup 0/C) and desorbing species both ionic and neutral. Total cross sections for neutral desorption can be as high as 10/sup -16/ cm/sup 2/ and are generally 100 times as high as ionic desorption cross sections. Results are generally quite similar independ… more
Date: November 1, 1976
Creator: Lichtman, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Application of a Java-based, univel geometry, neutral particle Monte Carlo code to the searchlight problem

Description: A univel geometry, neutral particle Monte Carlo transport code, written entirely in the Java programming language, is under development for medical radiotherapy applications. The code uses ENDF-VI based continuous energy cross section data in a flexible XML format. Full neutron-photon coupling, including detailed photon production and photonuclear reactions, is included. Charged particle equilibrium is assumed within the patient model so that detailed transport of electrons produced by photon i… more
Date: April 1, 2005
Creator: Wemple, Charles A. & Cogliati, Joshua J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Channeling collimation studies at the Fermilab Tevatron

Description: Bent crystal channeling has promising advantages for accelerator beam collimation at high energy hadron facilities such as the LHC. This significance has been amplified by several surprising developments including multi-pass channeling and the observation of enhanced deflections over the entire arc of a bent crystal. The second effect has been observed both at RHIC and recently at the Tevatron. Results are reported showing channeling collimation of the circulating proton beam halo at the Tevatr… more
Date: August 1, 2006
Creator: Carrigan, Richard A.; Drozhdin, Alexandr I.; Fliller, Raymond P., III; Mokhov, Nikolai V.; Shiltsev, Vladimir D.; Still, Dean A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

pi+ p Interactions at 250-GeV/c in improved FNAL 30 inch hybrid system

Description: We propose to utilize the excellent momentum resolution, increased angular acceptance, and neutral particle detection capabilities of the improved FNAL 30' hybrid bubble chamber system to study interaction of 250 GeV/c {pi}{sup +} mesons in an enriched {pi}{sup +(l)} beam. We will examine leading particle effects and diffraction dissociation, long and short range correlations, inclusive single particle and resonance production, strange particle production, and systematics of events with forward… more
Date: May 1, 1975
Creator: Bugg, W.M.; Condo, G.T.; Hart, E.L.; Handler, T.; U., /Tennessee; Cohn, H.O. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen