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Statistical fluctuations in heavy-ion collisions

Description: The relevance of the statistical equilibrium limit to the description of substantially relaxed degrees of freedom is discussed. Fluctuations are considered specifically in the following processes: the correlation between entrance-channel angular momentum and exit-channel kinetic energy; the sharing of the dissipated kinetic energy between the two fragments; the magnitude and the alignment of the fragment angular momentum including the effect of shell structure. It is found that statistical fluc… more
Date: February 1, 1982
Creator: Moretto, Luciano G.
Partner: UNT Libraries Government Documents Department
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Hadron-hadron physics at high energy and luminosity

Description: I review some recent theoretical issues relevant to the physics of hadron-hadron collisions. I discuss processes where either energy or luminosity is the most important feature and emphasize the need for experiments at luminosities of 10{sup 33}cm{sup -2}sec{sup 1} if the full range of physics options is to be thoroughly explored. 22 refs., 10 figs.
Date: November 8, 1989
Creator: Hinchliffe, I.
Partner: UNT Libraries Government Documents Department
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Recent results of studies of acceleration of compact toroids

Description: The observed gross stability and self-contained structure of compact toroids (CT's) give rise to the possibility, unique among magnetically confined plasmas, of translating CT's from their point of origin over distances many times their own length. This feature has led us to consider magnetic acceleration of CT's to directed kinetic energies much greater than their stored magnetic and thermal energies. A CT accelerator falls in the very broad gap between traditional particle accelerators at one… more
Date: March 2, 1984
Creator: Hammer, J. H.; Hartman, C. W. & Eddleman, J.
Partner: UNT Libraries Government Documents Department
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Neutron multiplicity measurements of Cf and Fm isotopes

Description: Prompt neutrons in coincidence with the two fission fragments from the SF of californium 250, 252, and 254, and fermium 256 and 257 were measured with a 75-cm-diameter, Gd-loaded liquid scintillation counter having a neutron-detection efficiency of about 80%. The kinetic energies of both fission fragments and the number of neutrons for each fission event were recorded. From these data, the fragment masses and kinetic energies, the average number of neutrons per fission, and the neutron multipli… more
Date: January 1, 1977
Creator: Hoffman, D. C.; Ford, G. P.; Balagna, J. P. & Veeser, L. R.
Partner: UNT Libraries Government Documents Department
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New particle searches at CDF

Description: We present results from searches for the top quark, supersymmetric particles, and new gauge bosons at the Collider Detector at Fermilab (CDF). 8 refs., 6 figs.
Date: January 1, 1991
Creator: Kuhlmann, S.E.
Partner: UNT Libraries Government Documents Department
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Combustion-turbulence interaction in the turbulent boundary layer over a hot surface

Description: The turbulence-combustion interaction in a reacting turbulent boundary layer over a heated flat plate was studied. Ethylene/air mixture with equivalence ratio of 0.35 was used. The free stream velocity was 10.5 m/s and the wall temperature was 1250/sup 0/K. Combustion structures visualization was provided by high-speed schlieren photographs. Fluid density statistics were deduced from Rayleigh scattering intensity measurements. A single-component laser Doppler velocimetry system was used to obta… more
Date: January 1, 1982
Creator: Ng, T.T.; Cheng, R.K.; Robben, F. & Talbot, L.
Partner: UNT Libraries Government Documents Department
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Diffusion model predictions for kinetic energy, mass, angular distributions, and. gamma. -ray multiplicities in heavy ion induced reactions

Description: In the present formalism the diffusion along the mass asymmetry coordinate has been generalized by refining the treatment of the radial and angular motion necessary for an adequate reproduction of the kinetic energy and angular distributions. The radial potential is used to evaluate the radial force. The interaction time and the average penetration for each l-wave are estimated. The diffusion calculation is then carried out for the duration of the interaction time. The angular rotation during d… more
Date: August 1, 1977
Creator: Moretto, Luciano G.
Partner: UNT Libraries Government Documents Department
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Inclusive jet cross sections and jet shapes at CDF

Description: The inclusive jet cross section and jet shapes at {radical}s = 1.8 TeV have been measured by CDF at the Fermilab Tevatron Collider. results are compared to recent next-to-leading order QCD calculations, which predict variation of the cross section with cone size, as well as variation of the jet shape with energy. A lower limit on the parameter {Lambda}{sub c}, which characterize a contact interaction associated with quark sub-structure is determined to be 1400 GeV at the 95% confidence level. 3… more
Date: September 1, 1991
Creator: Wainer, N.
Partner: UNT Libraries Government Documents Department
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Biomodal spontaneous fission

Description: Investigations of mass and kinetic-energy distributions from spontaneous fission have been extended in recent years to an isotope of element 104 and, for half-lives, to an isotope of element 108. The results have been surprising in that spontaneous fission half-lives have turned out to be much longer than expected and mass and kinetic- energy distributions were found to abruptly shift away from those of the lighter actinides, showing two modes of fission. These new developments have caused a re… more
Date: September 26, 1989
Creator: Hulet, E.K. (Lawrence Livermore National Lab., CA (USA))
Partner: UNT Libraries Government Documents Department
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Storage rings for heavy-ion atomic and nuclear physics

Description: A brief review is given of the physics goals and a few of the accelerator physics issues relevant to the new generation of small storage rings being built for atomic and nuclear physics use.
Date: January 1, 1986
Creator: Young, G. R.
Partner: UNT Libraries Government Documents Department
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Recent results from the CDF (Collider Detector at Fermilab) experiment at the Tevatron proton-antiproton collider

Description: Recent results from the CDF experiment are described. The Standard Model gives a good description of jet production, and W/Z production and decay. There is no evidence yet for the top quark, for fourth generation quarks, or for deviations from the Standard Model ascribable to quark substructure, supersymmetric particles, or heavy additional W-like or Z-like bosons. Limits are given where applicable. A search for a light Higgs Boson is also described. 11 refs., 24 figs.
Date: September 1, 1989
Creator: Geer, S. (Harvard Univ., Cambridge, MA (USA). High Energy Physics Lab.)
Partner: UNT Libraries Government Documents Department
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QCD and jets at CDF

Description: A summary of QCD results from the Collider Detector at Fermilab is presented. Comparisons are made to leading order, O({alpha}{sub s}{sup 2}), and next-to-leading order, O({alpha}{sub s}{sup 3}), parton level calculations and to leading logarithm shower Monte Carlo results.
Date: January 1, 1992
Creator: Flaugher, B.
Partner: UNT Libraries Government Documents Department
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Results from p p colliders

Description: Recent results {bar p}p colliders are presented. From elastic scattering experiments at the Tevatron, an average value of {sigma}{sub tot} = 72.1{plus minus}2 mb is reported, along with a new measurement of {rho} = 0.13 {plus minus} 0.7. New measurements of jet direct photon and high p{sub t} W and Z production are compared to more precise, higher order predictions from perturbative QCD. Recently available data on the W mass and width give combined values for M{sub W} = 80.14{plus minus}0.27 Ge… more
Date: August 1, 1991
Creator: Huth, J.
Partner: UNT Libraries Government Documents Department
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High energy heavy ion collisions and the RHIC (Relativistic Heavy Ion Collider) project at Brookhaven

Description: The most spectacular of the new high energy approaches to nuclear physics is the field of relativistic heavy ion collisions, for which it is anticipated that construction of the Relativistic Heavy Ion Collider (RHIC) facility will begin soon. Here the goal is to subject large volumes of nuclear matter to such extreme conditions of temperature and pressure that a new form of matter is produced in which the recognizable components are not the familiar neutrons and protons, but are quarks. This pa… more
Date: January 1, 1989
Creator: Ludlam, T.W. (Brookhaven National Lab., Upton, NY (USA))
Partner: UNT Libraries Government Documents Department
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Ultrarelativistic nucleus-nucleus collisions at CERN

Description: The aim of the NA-35 experiment is to study nuclear matter under extreme conditions. Evidence that conditions reached in 60 GeV/N and 200 GeV/N relativistic heavy ion collisions are adequate for the formation of a quark-gluon plasma where color would no longer be confined to hadronic dimensions is presented. Future plans for experiments in 1990--1991 with {sup 32}S beams and 1993 and up with Pb beams at the SPS are discussed. 26 refs., 23 figs., 3 tabs.
Date: October 1, 1989
Creator: Odyniec, G.
Partner: UNT Libraries Government Documents Department
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Strangeness production at 200 GeV/Nucleon

Description: Results from the HELIOS External Spectrometer on kaon production in 200 GeV/A S+W and p+W collisions are presented. The K/{pi} ratios are compared with measurements at lower bombarding energies and are found to agree remarkably well. Evidence for secondary production of K{sup +} by meson-baryon rescattering is reviewed. The target rapidity results are compared with neutral strange particle results at midrapidity. 15 refs., 4 figs., 2 tabs.
Date: January 1, 1991
Creator: Jacak, B.V.
Partner: UNT Libraries Government Documents Department
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Jets in CDF

Description: In the 1988/89 Tevatron Collider run the CDF experiment collected 4.0 {plus minus} 0.3 pb{sup {minus}1} of proton-antiproton interactions at a center-of-mass collision energy currently available in the laboratory and gives us a unique opportunity for studying Quantum Chromodymanics (QCD) processes at the highest available energies. We report results from various QCD studies performed with this data. 11 refs., 8 figs.
Date: July 1, 1991
Creator: Buckley-Geer, E. (Rutgers--the State Univ., New Brunswick, NJ (United States))
Partner: UNT Libraries Government Documents Department
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Exploratory gas-target experiment at PEP using the TPC/2. gamma. facility

Description: A pilot nuclear-physics experiment at the PEP ring was performed by bleeding deuterium, argon, and xenon gases into the interaction region containing the TPC/2Y facility. The purpose of the experiment was to obtain information for the design of a dedicated nuclear-physics interaction region at PEP, as well as to obtain a first view of the physics that could be studied at such a facility. 1 ref., 4 figs.
Date: June 1, 1986
Creator: Dietrich, F. S.; Melnikoff, S. O. & Van Bibber, K. A.
Partner: UNT Libraries Government Documents Department
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EMPACT: A detector for high-p sub T physics at the SSC

Description: EMPACT is a high-transverse-momentum physics detector for the SSC. It aims for a precise measurement of electrons, muons, jets, and missing transverse energy using a superior calorimeter surrounded by air-core toroidal magnets forming a precision muon spectrometer. The baseline design of EMPACT is described. 5 refs., 11 figs.
Date: 1990
Creator: Womersley, J.
Partner: UNT Libraries Government Documents Department
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Search for supersymmetric particles at CDF

Description: Analyses of events with large unbalanced transverse energy from the 1987 and 1988-89 CDF data runs have set limits on the masses of supersymmetric squarks and gluinos. In a simple model with a stable photino as the lightest supersymmetric particle, the 1987 data with an integrated luminosity of 25.3 nb{sup {minus}1} have excluded at the 90% CL, squarks of mass less than 73 GeV/c{sup 2} and gluinos of mass less than 74 GeV/c{sup 2}. Preliminary results from an analysis of 1 pb{sup {minus}1} of d… more
Date: January 1, 1989
Creator: Wagner, R.G. (Argonne National Lab., IL (USA))
Partner: UNT Libraries Government Documents Department
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QCD tests at CDF

Description: Recent analysis of jet data taken at the Fermilab Tevatron Collider at {radical}S = 1.8 Tev are presented. Inclusive jet, dijet, trijet and direct photon measurements are compared to QCD parton level calculations, at orders {alpha}{sub s}{sup 3} or {alpha}{sub s}{sup 2}. The large total transverse energy events are well described by the Herwig shower Montecarlo. 19 refs., 20 figs., 1 tab.
Date: May 1, 1991
Creator: Giannetti, P. (Istituto Nazionale di Fisica Nucleare, Pisa (Italy))
Partner: UNT Libraries Government Documents Department
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Time dependent degradation of energetic electrons in gaseous and condensed media

Description: A transport equation formulated by Spencer and Fano has been used to calculate initial yields of products formed by electron interactions under conditions of steady state irradiation. Since experimental observation of initial yields may now be possible it is desirable to generalize the treatment of Spencer and Fano to include transient effects explicitly. 6 refs., 2 figs.
Date: January 1, 1987
Creator: Dillon, M. & Kimura, M.
Partner: UNT Libraries Government Documents Department
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Parameter studies to determine sensitivity of slug impact loads to properties of core surrounding structures

Description: A sensitivity study of the HCDA slug impact response of fast reactor primary containment to properties of core surrounding structures was performed. Parameters such as the strength of the radial shield material, mass, void, and compressibility properties of the gas plenum material, mass of core material, and mass and compressibility properties of the coolant were used as variables to determine the magnitude of the slug impact loads. The response of the reactor primary containment and the partit… more
Date: January 1, 1985
Creator: Gvildys, J.
Partner: UNT Libraries Government Documents Department
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Beam Compression in Heavy-Ion Induction Linacs

Description: The Heavy-Ion Fusion Sciences Virtual National Laboratory is pursuing an approach to target heating experiments in the Warm Dense Matter regime, using space-charge-dominated ion beams that are simultaneously longitudinally bunched and transversely focused. Longitudinal beam compression by large factors has been demonstrated in the LBNL Neutralized Drift Compression Experiment (NDCX) experiment with controlled ramps and forced neutralization. The achieved peak beam current and energy can be used… more
Date: January 1, 2009
Creator: Seidl, P. A.; Anders, A.; Bieniosek, F. M.; Barnard, J. J.; Calanog, J.; Chen, A. X. et al.
Partner: UNT Libraries Government Documents Department
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