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in subjects: "Baryon-Baryon Interactions"

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Generalization of the quark rearrangement model. [Quark-parton model]

An extension and generalization of the quark rearrangement model of baryon annihilation is described which can be applied to all annihilation reactions and which incorporates some of the features of the highly successful quark parton model. Some p anti-p interactions are discussed. (JFP)

Date: January 1, 1976

Creator: Fields, T. & Chen, C. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A study of four jet events and search for double parton scattering at radical s = 1. 8 TeV

Kinematic properties of four jet events taken during the 1988/89 run of the Tevatron at Fermilab are compared with the predictions of a leading order QCD calculation. Preliminary work on a search for double parton scattering is presented.

Date: June 1, 1992

Creator: Keeble, L. J. (Texas A and M Univ., College Station, TX (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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nD scattering at 180/sup 0/ for neutron energies from 200 to 800 MeV. [Preliminary results, differential cross sections, 200 to 800 MeV]

In the expectation that information on the high momentum components of the deuteron wave function can be obtained from the scattering of hadrons of modest energy, the 180/sup 0/ excitation function is reported which was measured in nd elastic scattering for incident energies of 200 to 800 MeV. Differential cross sections are plotted. However, only a small fraction of the data are analyzed thus far. 17 references. (JFP)

Date: January 1, 1977

Creator: Bonner, B. E.; Hollas, C. L.; Newsom, C. R.; Riley, P. J. & Glass, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Effects on spin asymmetries of special effects at 90/sup 0/

Hadron and quark exchange contributions to spin symmetries at 90/sup 0/ in hadron elastic scattering are investigated. The angular distribution of scattering cross sections is considered for incident protons with contributions from nonflip and double-flip amplitudes for states of parallel and antiparallel spins. 5 refs.

Date: January 1, 1986

Creator: Lipkin, H. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for new particles in CDF

Preliminary results on searches for new particles beyond the Standard Model are presented. The data were taken by the CDF collaboration at the Fermilab {bar p}p collider at a center of mass energy of 1.8 TeV. Limits on the masses of the gluino and squark in a minimal supersymmetric theory are given. The 90% confidence level asymptotic lower mass limits on each are 150 GeV/c{sup 2}. A special data run was taken to search for the diffractively produced sextet quark state {eta}{sub 6}. An {eta}{su… more

Date: September 1, 1991

Creator: Laasanen, A. (Purdue Univ., Lafayette, IN (United States). Dept. of Physics)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Anti pp searches for quark-gluon plasma at TeV I

Three experiments that have been approved to run at TeV I are discussed from the viewpoint of their capability to search for evidence of the QCD phase transition in proton-antiproton collisions at 1.6 TeV. One of these experiments, E-735, was proposed as a dedicated search for quark-gluon plasma effects with a detector designed to study large total E/sub T/, low P/sub T/ individual particles. The other two, E-741 (CDF) and E-740 (DO), embody general purpose four-pi detectors designed primarily … more

Date: June 1986

Creator: Turkot, Frank

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Off-shell effects in the nucleon--nucleon system, Session 2. [Review]

A review of the current status of calculations of nucleon-nucleon bremsstrahlung, and comparisons with recent experiments, is presented. 37 references.

Date: January 1, 1978

Creator: Heller, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Scaling behavior of jet production at CDF

Inclusive jet cross-sections have been measured in [bar p]p collisions at [radical]s = 546 and 1800 GeV, using the CDF detector at the Fermilab Tevatron. The ratio of jet cross-sections is compared to predictions from simple scaling and 0([alpha][sub s[sup 3]]) QCD.

Date: November 1, 1992

Creator: Behrends, S. (Brandeis Univ., Waltham, MA (United States). Dept. of Physics)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for parity violation in polarized proton scattering at 6 GeV/c. [A symmetry, preliminary results]

A small deviation is sought from the parity symmetry in proton--nucleon scattering. For 6 GeV polarized protons on H/sub 2/O a preliminary value of Ay = ..delta..sigma/P2sigma is found for the longitudinal asymmetry (include systematic errors) using ion chamber detectors, and Ay = (include systematic errors) using scintillator detectors. 4 references

Date: January 1, 1978

Creator: Nagle, D. E.; Bowman, J. D. & Hoffman, C. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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S-matrix theory of nuclear forces

The use of the S-matrix theory for deriving the nucleon-nucleon interaction is reviewed. Fits to recent NN data are described. Applications to nuclear structure properties and nucleon-nucleus reactions are also discussed, and the results compared with data. 20 references.

Date: September 1, 1984

Creator: Vinh Mau, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Intermediate energy proton and light-ion scattering

A review is presented of recent (1979-81) developments in the field of intermediate-energy proton and light-ion scattering from nuclei. New theoretical and calculational techniques of particular interest to experimentalists are discussed. Emphasis is placed on topics in nuclear structure physics - giant resonances, pion-condensation precursor phenomena, and polarization transfer (spin-flip) experiments - where intermediate energy proton and light-ion scattering has made new and unique contribut… more

Date: January 1, 1981

Creator: Moss, J.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for the top quark and other new particles at D0

Preliminary results from the search for the top quark and other new particles in p[bar p] collisions at [radical]s = 1.8 TeV are reported. In a data sample corresponding to an integrated luminosity of about 7.5 pb[sup [minus]1], one candidate event for top quark is found in the di-lepton channel. A lower limit for the mass of the top quark of 103 GeV/c[sup 2] (99 Gev/c[sup 2]) is obtained at 95% confidence level with (without) background subtraction. Status of searches for other new particles t… more

Date: September 1, 1993

Creator: Bhat, P.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Spin-spin correlations in proton-proton collisions at high energy and threshold enhancements

The striking effects in the spin structure observed in elastic proton collisions and the Nuclear Transparency phenomenon recently discovered at BNL are described in terms of heavy quark threshold enhancements. The deviations from scaling laws and the broadening of the angular distributions at resonance are also consistent with the introduction of new degrees of freedom in the pp system. This implies new s-channel physics. Predictions are given for the spin effects in pp collisions near 18.5 GeV… more

Date: May 1, 1988

Creator: de Teramond, G.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Study of charged particles associated with high-p/sub T/ photons and pions

We report on the distributions of charged particles produced in association with high p/sub T/ prompt photons and neutral pions in pp collisions at ..sqrt.. s = 63 GeV and theta = 90/sup 0/ in the centre of mass. We find photons to be relatively unaccompained by other particles at small angles with respect to the photon, and thereby extract a measurement of the fraction of prompt photons due to bremsstrahlung production. The relative density of positive to negative particles in the system recoi… more

Date: July 1, 1982

Creator: Akesson, T.; Albrow, M.G. & Almehed, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Empirical estimates of the proton-neutron interaction and diabolical points

The use of constant-N contours in the ({omega},{lambda}) plane is demonstrated both for establishing diabolical points and for studying regularities and fluctuations in the spectrum of single-particle states. Likewise the average properties and fluctuations of empirical proton-neutron interactions, obtained from double differentials of the total energy with respect to N and Z, are discussed for the ground states of all even-even nuclei with N > 40 and as a function of the rotational frequency f… more

Date: January 1, 1990

Creator: Zhang, J.-Y. (Academia Sinica, Beijing, BJ (China). Inst. of Theoretical Physics Brookhaven National Lab., Upton, NY (USA) Joint Inst. for Heavy Ion Research, Oak Ridge, TN (USA) Academia Sinica, Lanzhou, GS (China). Inst. of Modern Physics); Garrett, J.D. (Oak Ridge National Lab., TN (USA)); Casten, R.F. (Brookhaven National Lab., Upton, NY (USA)) & Brenner, D.S. (Clark Univ., Worcester, MA (USA)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The use of the Fermilab antiproton Accumulator in medium energy physics experiments

The Fermilab antiprotron Accumulator has been modified for use in a medium energy experiment. The experiment is conducted with circulating antiproton beam of momentum between 6.7 GeV/c and 3.7 GeV/c colliding with protons from an internal gas jet. Antiprotons are accumulated at the normal momentum of 8.9 GeV/c and then decelerated to the appropriate energy. It is necessary to cool the beam continually during the time it is colliding with the gas jet. The experiment requires new provisions for t… more

Date: June 7, 1988

Creator: Bharadwaj, V.; Church, M.; Harms, E.; Hsueh, S.Y.; Kells, W.; MacLachlan, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Models of. pi. NN interactions

A ..pi..NN model inspired by Quantum Chromodynamics is presented. The model gives an accurate fit to the most recent Arndt NN phase shifts up to 1 GeV and can be applied to study intermediate- and high-energy nuclear reactions. 20 refs., 2 figs.

Date: January 1, 1988

Creator: Lee, T. S. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Effects of recent measurements on phase shift analysis of nucleon--nucleon scattering. [Below 250 MeV]

Four recent measurements in pp and np scattering below 250 MeV are used to indicate the substantial influence that new experiments can have upon phase parameters derived from the expanded data base. The cases are described separately, and the collective effect upon energy dependent analyses is discussed. It is indicated that the types of change are far from negligible. 7 refs. (JFP)

Date: January 1, 1977

Creator: Arndt, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Total, Elastic and Diffractive Cross Sections at High Energies

The status of hadron-hadron total, elastic and diffractive scattering is discussed, including recent data from Fermilab experiment E-710. 15 refs., 24 figs.

Date: August 1990

Creator: Rubinstein, Roy

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Calorimetry applied to nucleus-nucleus collisions at ultrarelativistic energies

A general introduction to high-energy calorimetry is presented, together with brief descriptions of the two types of cascades relevant to calorimetric measurements. This is followed by a discussion of ''compensation'' and of the ''e/h'' ratio. A detailed description of two calorimeters designed and constructed for the CERN WA80 experiment are also given. 16 refs., 17 figs., 5 tabs.

Date: January 1, 1988

Creator: Plasil, F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Evolution of LAMPF and its research programs

The multiple beam lines and the variety of particle beams at the Clinton P. Anderson Meson Physics Facility (LAMPF) permit a wide range of experiments in particle and nuclear physics and nuclear chemistry. Some of the principal achievements at LAMPF during the past few years are described.

Date: June 1, 1982

Creator: Rosen, L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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High-energy hadron-hadron collisions. Annual progress report

Work on high energy hadron-hadron collisions in the geometrical model is summarized. Specific items that were studied include the existence and movement of dips in elastic p anti p collisions, the angular distributions for elastic scattering and diffraction dissociation of hadrons on nuclei, and a model calculation of scattering parameters in high energy two-body collisions.

Date: February 1, 1981

Creator: Chou, T.T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The proton-neutron residual interaction in nuclear structure

Although the importance of the residual T = 0 proton-neutron (p-n) interaction in inducing single nucleon configuration mixing, nonspherical nuclear shapes, collectivity, and phase transitions have been known for nearly forty years, its widespread ramifications have become more fully appreciated only recently as a unified picture of the effects of the p-n interaction is emerging. A phenomenological approach that has proved useful is the N{sub p}N{sub n} scheme and the associated concept of the … more

Date: January 1, 1990

Creator: Carsten, R. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Parity violating total cross sections

A diquark-quark scattering model for the parity-violating asymmetry in nucleon-nucleon scattering is described. Criticism of the model by Simonius and Unger is refuted. The strong energy dependence of the result, and the possibility of important non-valence contributions to the nucleon polarization, both support the need for further measurements at Fermilab and at Brookhaven energies. 9 refs., 7 figs.

Date: January 1, 1988

Creator: Goldman, T. & Preston, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department