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Monte Carlo sensitivity in jet studies - what is the physics

Description: Tests of perturbative QCD in hard processes involving jets have been found to depend on the jet fragmentation model used. We emphasize the need for testing the factorization of hard and soft processes, i.e., the independent fragmentation of jets. A method of analysis is suggested, which allows a model-independent determination of the gluon fragmentation function from e/sup +/e/sup -/ data. We also comment on some simple features expected in anti pp ..-->.. (2 or 3 jets) + X events. 19 reference… more
Date: July 1, 1983
Creator: Hoyer, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Studies of particle interactions in bubble chamber, spark chambers and counter experiments: Task P. Annual progress report

Description: Our current work reflects the general aim of this task, which is to calculate phenomenological theories of interest to present experiments. Recently, this has emphasized the jet calculus approach to properties of quark and gluon jets. Progress is reviewed.
Date: July 1, 1983
Creator: Jones, L.M.; Holloway, L.; O'Halloran, T.A. Jr. & Simmons, R.O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Actinide Production in the Reaction of Heavy Ions withCurium-248

Description: Chemical experiments were performed to examine the usefulness of heavy ion transfer reactions in producing new, neutron-rich actinide nuclides. A general quasi-elastic to deep-inelastic mechanism is proposed, and the utility of this method as opposed to other methods (e.g. complete fusion) is discussed. The relative merits of various techniques of actinide target synthesis are discussed. A description is given of a target system designed to remove the large amounts of heat generated by the pass… more
Date: July 1, 1983
Creator: Moody, K. J.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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E-Division activities report

Description: This report describes some of the activities in E (Experimental Physics) Division during the past year. E-division carries out research and development in areas related to the missions of the Laboratory. Many of the activities are in pure and applied atomic and nuclear physics and in materials science. In addition, this report describes development work on accelerators and on instrumentation for plasma diagnostics, nitrogen exchange rates in tissue, and breakdown in gases by microwave pulses.
Date: July 1, 1983
Creator: Barschall, H.H. (comp.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Planar Channeling Radiation From Relativistic Positrons and Electrons in LiF

Description: Channeling radiation has been measured for planar-channeled 54- and 83-MeV positrons and 17-, 31-, and 54-MeV electrons in the ionic crystal LiF. The results are shown to be in reasonable, but not perfect, agreement with the results of many-beam calculations based upon a model of the crystal as an array of isolated Li/sup +/ and F/sup -/ ions.
Date: July 1, 1983
Creator: Berman, B. L.; Datz, S.; Fearick, R. W.; Swent, R. L.; Pantell, R. H.; Park, H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Dynamic characteristic of intense short microwave propagation in an atmosphere

Description: The dynamic behavior of an intense microwave pulse which propagates through the atmosphere will be presented. Our theoretical results are obtained by solving Maxwell's equations, together with the electron fluid equations. Our calculations show that although large portions of the initial energy are absorbed by the electrons that are created through the avalanche process, a significant amount of energy is still able to reach the earth's surface. The amount of energy that reaches the earth's surf… more
Date: July 1, 1983
Creator: Yee, J. H.; Alvarez, R. A.; Mayhall, D. J.; Madsen, N. K. & Cabayan, H. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Studies of particle interactions in bubble chamber, spark chambers and counter experiments. Annual progress report

Description: During the past six years we have carried out and planned experiments which predominantly studied the production and decay of particles containing charmed quarks. A series of photoproduction and neutron production experiments started with the very early observation of the production of J/psi by neutrons and by photons at Fermilab. From subsequent experiments using these neutral beams and the basic detecting system, we have reported results on the photoproduction of the ..lambda../sub c/ charmed… more
Date: July 1, 1983
Creator: Holloway, L.E.; O'Halloran, T.A. Jr. & Simmons, R.O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Intense positron beams and possible experiments

Description: In this paper, we survey some of the ideas that have been proposed regarding the production of intense beams of low energy positrons. Various facilities to produce beams of this type are already under design or construction and other methods beyond those in use have been previously discussed. Moreover, a variety of potential experiments utilizing intense positron beams have been suggested. It is to be hoped that this paper can serve as a useful summary of some of the current ideas, as well as a… more
Date: July 1, 1983
Creator: Lynn, K.G. & Frieze, W.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Weak Neutral-Current Effects in e/sup +/e/sup -/. -->. mu. /sup +/. mu. /sup -/ at 29 GeV

Description: We present a measurement of the cross section for production of collinear muon pairs based upon a sample of more than 10,000 events observed in the MAC detector at PEP. From the asymmetry A/sub ..mu mu.. = -0.058 +- 0.010 we find the axial vector weak neutral coupling to be given by g/sub A//sup e/g/sub A//sup ..mu../ = 0.24 +- 0.04.
Date: July 1, 1983
Creator: Fernandez, E.; Ford, W. T.; Read, A. L. Jr.; Smith, J. G.; De Sangro, R.; Marini, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Raman Spectroscopy of Shocked Water

Description: Raman scattering has been used extensively to study the vibrational and rotational properties of molecules under a variety of conditions. Here, interest is in the behavior of water molecules shocked to high pressures and temperatures. Behind the shock front the water molecules undergo changes in bonding and the molecules may become ionized. Raman spectroscopy can be used to determine the molecular species behind the shock front. In addition, changes in Raman spectra can yield information regard… more
Date: July 1, 1983
Creator: Holmes, N. C.; Mitchell, A. C.; Nellis, W. J.; Graham, W. B. & Walrafen, G. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Search for Inclusive Oscillations of Muon Neutrinos in the Mass Range, 20 <. Delta. M/sup 2/ < 900 Ev/sup 2/

Description: A sensitive search for inclusive neutrino oscillations has been performed using two similar detectors running simultaneously at different locations in the Fermilab dichromatic muon-neutrino beam. The preliminary results show no significant oscillation signal and rule out inclusive oscillations of muon neutrinos into any other type of neutrons for 20 < ..delta..m/sup 2/ < 900 eV/sup 2/ and sin/sup 2/(2 theta) > 0.03 to 0.10.
Date: July 1, 1983
Creator: Haber, C.; Auchincloss, P.; Blair, R.; Ruiz, M.; Sciulli, F.; Shaevitz, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ArII - ArXVI produced in slow recoil collisions

Description: An atom in a gaseous target may be highly ionized in a single collision with a (very fast) very highly ionized projectile. A feature of the kinematics of the collision is that very little kinetic energy is imparted to the target atom. The ion is produced as a slow recoil. Typical recoil energies are 1 eV and change little with the degree of ionization produced in the target. This has several very attractive features as a spectroscopic source. First, the spectra are free from Doppler shifts whic… more
Date: July 1, 1983
Creator: Gould, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New particles and interactions

Description: It is intended to indicate how multiparticle dynamics might serve as a valuable means of advancing our knowledge down the more fundamental line of elementary particle physics. The point of view is taken that the Standard SU(3) x SU(2) x U(1) Model is well established, and is now ripe to be used as a tool for analyzing physics beyond the Standard Model. The tool kit should include reliable and efficient ways of distinguishing gluon jets from quark jets, and of discriminating between t,b,c and li… more
Date: July 1, 1983
Creator: Ellis, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Discussion on the control method of the inductor-converter bridge by simulation and experiment

Description: With the development of the superconducting magnet as an energy storage unit, pulsed power loads between superconducting magnets of increasing magnitude up to several hundred megawatts or more appear within the realm of possibility. An energy storage unit that is independent of the power grid can be used in applications where the pulsed power required from the power grid may cause a hazardous effect on the power system. An energy transfer system between the storage and the load units eliminates… more
Date: July 1, 1983
Creator: Hirano, M. & Kustom, R.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Molecular-beam scattering

Description: The molecular-beam technique has been used in three different experimental arrangements to study a wide range of inter-atomic and molecular forces. Chapter 1 reports results of a low-energy (0.2 kcal/mole) elastic-scattering study of the He-Ar pair potential. The purpose of the study was to accurately characterize the shape of the potential in the well region, by scattering slow He atoms produced by expanding a mixture of He in N/sub 2/ from a cooled nozzle. Chapter 2 contains measurements of t… more
Date: July 1, 1983
Creator: Vernon, M. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Spectrum of resistive MHD modes in cylindrical plasmas

Description: A numerical study of the normal modes of a compressible resistive MHD fluid in cylindrical geometry is presented. Resistivity resolves the shear Alfven and slow magnetosonic continua of ideal MHD into discrete spectra and gives rise to heavily damped modes whose frequencies lie on specific lines in the complex plane. Fast magnetosonic waves are less affected but are also damped. Overstable modes arise from the shear Alfven spectrum. The stabilizing effect of favorable average curvature is shown… more
Date: July 1, 1983
Creator: Ryu, C. M. & Grimm, R. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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X-ray streak crystal spectography

Description: We have built an x-ray streaked crystal spectrograph for making time-resolved x-ray spectral measurements. This instrument can access Bragg angles from 11/sup 0/ to 38/sup 0/ and x-ray spectra from 200 eV to greater than 10 keV. We have demonstrated resolving powers, E/..delta..E > 200 at 1 keV and time resolution less than 20 psec. A description of the instrument and an example of the data is given.
Date: July 1, 1983
Creator: Kauffman, R.L.; Brown, T. & Medecki, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Plasma-particle interaction effects in induction plasma modelling under dense loading conditions

Description: The injection of solid particles or aerosol droplets in the fire-ball of an inductively coupled plasma can substantially perturb the plasma and even quench it under high loading conditions. This can be mainly attributed to the local cooling of the plasma by the particles or their vapour cloud, combined with the possible change of the thermodynamic and transport properties of the plasma in the presence of the particle vapour. This paper reports the state-of-the-art in the mathematical modelling … more
Date: July 1, 1983
Creator: Proulx, P.; Mostaghimi, J. & Boulos, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Properties of jets in high-E/sub T/ events produced in pp collisions at. sqrt. s = 63 GeV

Description: The properties of jets in high-E/sub tau/ events produced in pp collisions at ..sqrt..s = 63 GeV have been studied at the CERN Intersecting Storage Rings. The fragmentation of the jets is found to be similar to that of jets produced in e/sup +/e/sup -/ annihilation. The jets are wider than calculated from a constituent scattering model with no hard bremsstrahlung component. The charge correlations of positive and negative particles show differences consistent with expectation from valence-quark… more
Date: July 1, 1983
Creator: Akesson, T.; Albrow, M.G.; Almehed, S.; Batley, R.; Benary, O.; Boggild, H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Spin-polarization observables at the J = 3/2/sup +/ resonance in the reactions /sup 3/H(d,n)/sup 4/He and /sup 3/He(d,p)/sup 4/He

Description: With the assumption that a single s-wave J = 3/2/sup +/ reaction amplitude contributes to the /sup 3/H(d,n)/sup 3/He or /sup 3/He(d,p)/sup 4/ reaction at the J = 3/2/sup +/ resonance, the relative values of the spin-space transition matrix elements are fixed. These are used to calculate all of the spin-polarization observables.
Date: July 1, 1983
Creator: Conzett, H.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Volume generation of negative ions in high density hydrogen discharges

Description: A parametric survey is made of a high-density tandem two-chamber hydrogen negative ion system. The optimum extracted negative ion current densities are sensitive to the atom concentration in the discharge and to the system scale length. For scale lengths ranging from 10 cm to 0.1 cm optimum current densities range from of order 1 to 100 mA cm/sup -2/, respectively.
Date: July 1, 1983
Creator: Hiskes, J.R. & Karo, A.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fishbone and internal kinks

Description: The internal-kink mode, combined with neutral-beam heating and beam losses, appears to be responsible for the fishbone soft x-ray oscillations in PDX. Nonlinear simulations of both ideal and resistive kinks are presented and shown to be consistent with experimental observations. The internal kink may also be important in low-beta internal disruptions.
Date: July 1, 1983
Creator: Strauss, H.; Park, W.; Monticello, D.; Izzo, R.; White, R.; McGuire, K. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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