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Ab initio calculations on collisions of low energy electrons with polyatomic molecules

Description: The Kohn variational method is one of simplest, and oldest, techniques for performing scattering calculations. Nevertheless, a number of formal problems, as well as practical difficulties associated with the computation of certain required matrix elements, delayed its application to electron--molecule scattering problems for many years. This paper will describe the recent theoretical and computational developments that have made the complex'' Kohn variational method a practical tool for carryin… more
Date: August 1, 1991
Creator: Rescigno, T. N.
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Partner: UNT Libraries Government Documents Department
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Experimental Determination of the Effective Nucleon-Nucleon Interaction for P-Nucleus Reactions at Intermediate Energies

Description: A complete measurement of the polarization transfer observables has been made for the first time in the (p,p') reaction at intermediate energies. Measurements are reported for the /sup 12/C(p,p') /sup 12/C reaction to the 1/sup +/, T = 0(12.71 MeV) and 1/sup +/, T = 1(15.11 MeV) states at 500 MeV at laboratory scattering angles of 3.5/sup 0/, 5.5/sup 0/, 7.5/sup 0/, and 12.0/sup 0/. Linear combinations of these observables are shown to exhibit a very selective dependence on the isoscalar and is… more
Date: January 1, 1982
Creator: McClelland, J. B.; Aas, B. & Azizi, A.
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Partner: UNT Libraries Government Documents Department
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Probing QCD in low energy anti pp collisions

Description: A number of exclusive and inclusive antiproton reactions are discussed which could provide useful constraints or test novel features of quantum chromodynamics in the intermediate momentum transfer domain involving both perturbative and non-perturbative dynamics. High momentum transfer reactions are briefly reviewed. Inclusive antiproton reactions and the QCD critical length, QCD predictions for proton-antiproton exclusive processes, and studies of the Compton amplitude in proton-antiproton anni… more
Date: June 1, 1986
Creator: Brodsky, Stanley J.
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Partner: UNT Libraries Government Documents Department
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Theoretical aspects of lepton-hadron scattering

Description: In this paper, I will emphasize two points on Theoretical Aspects of Lepton-Hadron Scattering: (1) The crucial importance of testing the exact'' sum rules as tests of the local current algebra. Discrepancies, if found, between experiment and theory cannot be interpreted away'' in terms of more complex parton wave functions for the hadronic ground state. The three sum rules of interest are those of Adler, Bjorken, and Gross and Llewellyn-Smith. (2) An understanding of the corrections to scaling … more
Date: January 1, 1992
Creator: Drell, S.D.
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Partner: UNT Libraries Government Documents Department
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P P collider physics

Description: A brief introduction to {bar p}p collider physics is given. Selected results from the collider experiments at the CERN S{bar p}pS and the Tevatron collider are described. The emphasis is on experimental aspects of {bar p}p collisions. Minimum bias physics and the production of jets, Intermediate Vector Bosons and heavy flavors is reviewed. The outlook for physics at hadron colliders for the near future is briefly discussed.
Date: April 1, 1992
Creator: Demarteau, M. (State Univ. of New York, Stony Brook, NY (United States))
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Partner: UNT Libraries Government Documents Department
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Results from FNAL E745 on neutrino-nucleus interactions (EMC effect and hadron formation)

Description: The dark tracks (stubs) in high energy neutrino-nucleus interactions in the Tohoku High Resolution Freon Bubble Chamber are investigated. Classifying events into groups by using the dark tracks, correlations between the dark track production and neutrino interactions are studied. Events without dark tracks comprise a reasonable sample of events which occurred on quasi-free nucleons inside nucleus. By comparing the groups using the no dark track group as a comparison sample instead of neutrino-d… more
Date: January 1, 1989
Creator: Kitagaki, T. (Tohoku Univ., Sendai (Japan). Bubble Chamber Physics Lab.)
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Partner: UNT Libraries Government Documents Department
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Fragmentation and flow in central collisions

Description: Investigation of the fragmentation mechanism requires the measurement of complicated observables. To identify what part of the reacting system gives rise to the fragments, it would be useful to tag them as participants or spectators. A large acceptance for all the reaction products and an event-by-event measurement of the fragment multiplicity is required to distinguish fragment formation via sequential emission from a large equilibrated system and multifragmentation. In order to address whethe… more
Date: January 1, 1987
Creator: Jacak, B. V.; Doss, K. G. R.; Gustafsson, H. A.; Gutbrod, H.; Harris, J. W.; Kampert, K. H. et al.
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Partner: UNT Libraries Government Documents Department
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EMC Effect

Description: A review is presented of data and theoretical interpretations of the nuclear dependence of quark and antiquark distributions as observed in the deep inelastic scattering of neutrinos and charged leptons from nuclei. After a summary of the experimental situation and a survey of the broad spectrum of proposed explanations, I concentrate on the Q/sup 2/-rescaling approach and on interpretations in terms of conventional nuclear physics. The review concludes with a list of desirable future experimen… more
Date: June 1, 1986
Creator: Berger, E. L.
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Partner: UNT Libraries Government Documents Department
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Inclusive quasielastic and deep inelastic electron scattering at high energies

Description: With high electron energies a kinematic regime can be reached where it will be possible to separate quasielastic and deep inelastic scattering. We present a short description of these processes which dominate the inclusive spectrum. Using the highest momentum transfer data available to guide our estimates, we give the kinematic requirements and the cross sections expected. These results indicate that inclusive scattering at high q has a yet unfilled potential. 18 refs., 13 figs.
Date: January 1, 1990
Creator: Day, D.B.
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Partner: UNT Libraries Government Documents Department
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Interparticle interactions and polarization effects in colloids

Description: The physics of simple colloidal systems is usually dominated by three independent length scales: the particle size, the average interparticle distance, and the range of the interparticle potential. The dispersed particles typically have characteristic dimensions in the range 5 to 100 nm, often with spherical or cylindrical symmetry. Dispersion densities vary over volume fractions ranging from 0.5 to 10/sup -4/, with the corresponding mean interparticle distances ranging from about 1 to 10 diame… more
Date: January 1, 1987
Creator: Hayter, J. B.
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Partner: UNT Libraries Government Documents Department
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Particle angular distributions and gamma-ray multiplicities as experimental probes for angular-momentum fluctuations

Description: The sequential emission of /sup 4/He is demonstrated in the reaction Ho + Ta and the /sup 4/He angular distribution is used to test the rigid rotation limit in the reaction Ho + Ag. A more refined analysis of the dependence of continuum ..gamma..-ray multiplicities upon Q-value and gamma ray energy shows that reasonable agreement with the statistical model is obtained if one assumes the presence of low energy aligned dipole transitions in the reactions Ho, Yb, Sm, Ag + Ho. Sequential fission an… more
Date: March 1, 1982
Creator: Moretto, Luciano G.
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Partner: UNT Libraries Government Documents Department
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Outline of a proposal for a new neutron source: The pulsed neutron research facility

Description: Accelerator-based, pulsed spallation neutron sources have been performing neutron scattering research for about fifteen years. During this time beam intensities have increased by a factor of 100 and more than 50 spectrometers are now operating on four major sources worldwide. The pulsed sources have proven to be highly effective and complementary to reactor-based sources in that there are important scientific areas for which each type of source has unique capabilities. We describe a proposal fo… more
Date: April 1, 1992
Creator: Brown, B. S.; Carpenter, J. M. & Kustom, R. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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(p,2p) study of high-momentum components at 2. 1 GeV

Description: A (p,2p) experiment designed to isolate interactions with small numbers of fast nuclear constituents is described. Special attention is paid to the experimental manifestation and description of a correlated pair of nucleons in the nucleus. Phase space calculations are presented for the proton-pair three-body final state and for final states with larger number of particles. The Two Armed Spectrometer System (TASS) is described in detail. The data suggest the possibility of isolating an interacti… more
Date: July 1, 1982
Creator: Treuhaft, R.N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electron scattering from tensor-polarized deuterons in the VEPP-3 electron storage ring

Description: In this report we undertake a series of measurements at the VEPP-3 accelerator in Novosibirsk to measure the tensor analyzing power T(sub 20) out to Q(sup 2) equal to 1 GeV(sup 2). This experiment has been divided into three phases, which provide results at increasingly higher momentum transfers. In addition to the physics goals, this work is notable in that it represents the first use of polarized atoms in a storage tube as an internal target in an electron storage ring. 15 refs., 8 figs., 2 t… more
Date: January 1, 1991
Creator: Potterveld, D.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Medium energy nuclear physics research

Description: This paper covers the following topics: Experiment 87-02: Threshold Electrodisintegration of the Deuteron at High Q{sup 2}; Measurement of the 5th Structure Function in Deuterium and {sup 12}C; Single-Particle Densities of sd-Shell Nuclei; Experiment 84-28: Transverse Form Factors of {sup 117}Sn; Experiment 82-11: Elastic Magnetic Electron Scattering from {sup 13}C; Experiment 89-09: Measurement of the Elastic Magnetic Form Factor of {sup 3}He at High Momentum Transfer; Experiment 89-15: Coinci… more
Date: June 1, 1992
Creator: Peterson, G. A.; Dubach, J. F.; Hicks, R. S. & Miskimen, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The proton's spin: A quark model perspective

Description: Magnetic moments and g{sub A}/g{sub V} provide information on the correlations among quark spins and flavors in the proton. I compare this information with the deep inelastic polarized data from EMC which has been claimed to show that very little of the proton's spin is due to the quarks. The possibility that there is significant polarization of strange quarks within protons is discussed. 38 refs.
Date: January 1, 1989
Creator: Close, F. E.
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Partner: UNT Libraries Government Documents Department
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Lepton-pair production in hadron-nucleus collisions

Description: Physics motivations for precision measurements of lepton pair production in nuclei are discussed. Preliminary results from Fermilab Experiment E772 are presented. The relevance of these results to the EMC effect and to J/{psi} suppression in heavy ion collisions is also discussed. 34 refs., 17 figs.
Date: January 1, 1989
Creator: Moss, J. M.; Peng, J. C.; Alde, D. M.; Baer, H. W.; Carey, T. A.; Garvey, G. T. et al.
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Partner: UNT Libraries Government Documents Department
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Design issues for a laboratory high gain fusion facility

Description: In an inertial fusion laboratory high gain facility, experiments will be carried out with up to 1000 MJ of thermonuclear yield. The experiment area of such a facility will include many systems and structures that will have to operate successfully in the difficult environment created by the sudden large energy release. This paper estimates many of the nuclear effects that will occur, discusses the implied design issues and suggests possible solutions so that a useful experimental facility can be… more
Date: November 2, 1987
Creator: Hogan, W.J.
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Partner: UNT Libraries Government Documents Department
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Time-dependent aspects of electron degradation: 4, Subexcitation electrons in nitrogen and carbon dioxide

Description: We discuss here the temporal behavior of subexcitation electrons and the yields of products due to these subexcitation electrons. Our examples concern cases in which resonance scattering of electrons occurs, such as vibrational and rotational excitation in N{sub 2} and negative-ion formation in CO{sub 2}. One focus of the present work is a test of the continuous-slowing-down-approximation (CSDA) which we compare to the full solution of the time-dependent Spencer-Fano theory, which has been deve… more
Date: January 1, 1988
Creator: Kimura, Mineo; Inokuti, Mitio; Kowari, Ken-ichi; Dillon, M. A. & Pagnamenta, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Spin observables in proton-neutron scattering at intermediate energy

Description: A summary of np elastic scattering spin measurements at intermediate energy is given. Preliminary results from a LAMPF experiment to measure free neutron-proton elastic scattering spin-spin correlation parameters are presented. A longitudinally polarized proton target was used. These measurements are part of a program to determine the neutron-proton amplitudes in a model independent fashion at 500, 650, and 800 MeV. Some new proton-proton total cross sections in pure helicity states (..delta..s… more
Date: May 1, 1986
Creator: Spinka, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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