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in subjects: "Nucleon-Nucleon Interactions"

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Polarization as an instrument to explore the phenomenology and dynamics of vector spaces. [6 GeV]

It is shown on the example of an extensive set of polarization data of p-p elastic scattering at 6 GeV/c and t = -0.6 GeV/sup 2//c/sup 2/ that the careful choice of polarization formalisms to simplify the relationship between observables and amplitudes that nevertheless maintains a maximal amount of flexibility can enormously simplify the determination of the amplitudes as well as can yield clues to the dynamics underlying a reaction in atomic, nuclear, or high energy physics. 2 figures, 2 tabl… more

Date: January 1, 1980

Creator: Goldstein, G.R. & Moravesik, M.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Partial wave analysis of pp. -->. NN. pi. and dibaryon resonances

This talk summarizes results of a partial-wave analysis (PWA) of p up arrow p ..-->.. ..delta../sup + +/n ..-->.. p..pi../sup +/n in the dibaryon resonance region, using comprehensive data on single spin correlations from the effective mass spectrometer at the Argonne Zero Gradient Synchrotron. These results are compared with recent PWA for the bound nucleon final state, pp ..-->.. ..pi../sup +/d, by Bugg. These reactions are closely related, and neither displays Breit-Wigner resonance behavior… more

Date: January 1, 1986

Creator: Wicklund, A. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Resonant production of high-transverse-momentum back-to-back gluon jets in pp collisions. [27 GeV, cross sections, transverse momentum, angular distribution, proposed experiment]

The calorimetric study of two-gluon jets arising from inclusive production of 0/sup - +/, 0/sup + +/, and 2/sup + +/ b anti b states in hadron--hadron collisions was proposed. Cross sections of approx. = 0.2 x 10/sup -33/ cm/sup 2/ (approx. = 3 x 10/sup -33/ cm/sup 2/) are predicted for pp collisions at ..sqrt..s = 27 GeV (60 GeV). Also calculated were the transverse momentum and angular distributions of the jets. 14 references.

Date: January 1, 1978

Creator: Aubrecht, G. J., II; Nandi, S. & Wada, W. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nuclear structure at intermediate energies

The theme that unites the sometimes seemingly disparate experiments undertaken by the Bonner Lab Medium Energy Group is a determination to understand in detail the many facets and manifestations of the strong interaction, that which is now referred to as nonperturbative QCD. Whether we are investigating the question of just what does carry the spin of baryons, or the extent of the validity of the SU(6) wavefunctions for the excited hyperons (as will be measured in their radiative decays in our … more

Date: September 30, 1991

Creator: Bonner, B. E. & Mutchler, G. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Spin-flip (p,n) reactions on /sup 26/Mg, /sup 54/Fe, and /sup 56/Fe at selected proton bombarding energies in the range of 17 to 25 MeV

New data are presented for the /sup 26/Mg(p,n)/sup 26/Al reaction at E/sub p/ = 19.12 and 24.97 MeV, for the /sup 54/Fe(p,n)/sup 54/Co reaction at E/sub p/ = 17.20, 18.60, and 24.60 MeV, and for the /sup 56/Fe(p,n)/sup 56/Co reaction at E/sub p/ = 19.12 and 24.59 MeV. Data were taken with the LLNL Cyclograaff at 16 angles from 3.5/sup 0/ to 159.0/sup 0/. A large detector at 23.8/sup 0/ with a long neutron flight path collected high resolution spectra. This large detector also collected separate… more

Date: June 1, 1985

Creator: Aron, D.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Mechanism of light-particle emission

A general overview of the field of high-energy nuclear collisions studied from light particle spectra, pions, kaons, lambdas, protons, deuterons, and light composite fragments is given. Specifically, the basic reaction mechanism that determines the main features of particle emission such as the energy and angular distributions, the multiplicity, the production rate, the projectile and target mass dependences, the beam-energy dependences, etc. are discussed. Very general features of high-energy … more

Date: February 1, 1982

Creator: Nagamiya, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Polarization phenomena in nucleon-nucleon scattering at intermediate and high energies including the present status of dibaryons

We review experimental results concerning polarization phenomena in nucleon-nucleon scattering in which both the elastic scattering and hadron-production reaction are included. We also present summary of S = 0 dibaryon resonances and candidates by reviewing experimental data in the nucleon-nucleon system, ..gamma..d channel, ..pi..d elastic scattering, pp ..-->.. ..pi..d channel, deuteron break-up reactions, and narrow structures in missing-mass spectra. 93 refs., 26 figs.

Date: January 1, 1985

Creator: Yokosawa, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nuclear physics at extreme energy density

This report discusses topics in the following areas: QCD transport theory; minijets in hadronic and nuclear collisions; lattice gauge theory; hadronic matter and other studies; and strong electromagnetic fields. (LSP)

Date: May 15, 1992

Creator: Mueller, B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Pion production by target emission

The coherent production of pions in a proton nucleus collision is calculated. The energy region considered is below the nucleon-nucleon threshold so that the entire nucleus must take part in the process. The amplitude for this reaction is broken into two parts, the first part being characterized by initial emission of the pion from the projectile and the second part by initial emission from the target nucleus. It is the second part which is emphasized in this talk. The target nuclei /sup 12/C a… more

Date: January 1, 1981

Creator: Gibbs, W.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Oxygen-induced reactions at 60 A GeV and 200 A GeV studied by calorimetry

Results based on calorimetric measurements are presented from reactions of 60 A GeV and 200 A GeV /sup 16/O projectiles with C, Cu, Ag, and Au nuclei. Minimum-bias cross sections are discussed. Energy spectra measured at zero degrees and transverse-energy distributions for the pseudorapidity range 2.4 less than or equal to eta less than or equal to 5.5 are shown. An analysis of the average transverse energy in terms of the number of participating nucleons and the number of binary nucleon-nucleo… more

Date: November 12, 1987

Creator: Sorensen, S.P.; Albrecht, R.; Awes, T.C.; Baktash, C.; Beckmann, P.; Berger, F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Three-nucleon forces and the trinucleon bound states

A summary of the bound-state working group session of the ''International Symposium on the Three-Body Force in the Three-Nucleon System'' is presented. The paper includes a discussion of presently used calculational techniques, experimental evidence for three-nucleon forces in trinucleon ground states, future directions in theoretical research and future experimental research. (DWL)

Date: January 1, 1986

Creator: Friar, J.L. & Frois, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hard hadronic collisions: extrapolation of standard effects

We study hard hadronic collisions for the proton-proton (pp) and the proton-antiproton (p anti p) option in the CERN LEP tunnel. Based on our current knowledge of hard collisions at the present CERN p anti p Collider, and with the help of quantum chromodynamics (QCD), we extrapolate to the next generation of hadron colliders with a centre-of-mass energy E/sub cm/ = 10 to 20 TeV. We estimate various signatures, trigger rates, event topologies, and associated distributions for a variety of old an… more

Date: January 1, 1984

Creator: Ali, A.; Aurenche, P.; Baier, R.; Berger, E.; Douiri, A.; Fontannaz, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of the pp. -->. pi. d spin correlation parameters A/sub SL/ and A/sub LL/ at energies between 500 and 800 MeV

Angular distributions of the spin correlation parameters A/sub SL/ and A/sub LL/ for the inelastic reaction pp..--> pi..d have been measured at pion center-of-mass angles between 40 and 130/sup 0/, at energies of 500, 650, and 800 MeV. Additional measurements of A/sub LL/(THETA) were made at 600, 700, and 750 MeV. The reaction was studied using an incident beam of either longitudinally polarized protons. Both the final state pion and deuteron were detected in a two-armed detector system. The mo… more

Date: November 1, 1984

Creator: Barlow, D.B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Results from a hadron jet experiment at. sqrt. s = 19. 4 and 27. 4 GeV

In Fermilab experiment E609 we have studied the production of high p/sub t/ hadron jets by beams of protons at 200 and 400 GeV/c and pions at 200 GeV/c. Results for the single-jet and di-jet cross sections are given and are compared to QCD predictions. Leading-particle charge ratios from di-jet events are given and compared to QCD-motivated predictions. Evidence is presented concerning a higher twist effect in ..pi..p interactions as predicted by Berger and Brodsky. Preliminary results on high … more

Date: January 1, 1984

Creator: Arenton, M. W.; Chen, H. F.; Corcoran, M.; Cormell, L. R.; Ditzler, W. R.; Dris, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hadron-hadron elastic scattering at large momentum transfers

Cross sections for ..pi../sup + -/p, K/sup + -/p and p/sup + -/p elastic scattering for incident momenta above a few tens of GeV/c and momentum transfers in the range 1 less than or equal to -t less than or equal to 10 (GeV/c)/sup 2/ have recently been measured. The data are reviewed, and compared with existing models of elastic scattering.

Date: May 1, 1983

Creator: Rubinstein, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Transverse momentum spectra of dimuons produced in hadronic interactions and comparison with QCD

We have reviewed comprehensively the data on the transverse momentum spectra (p/sub T/) of high mass lepton pairs produced in hadronic interations. The data are extensively compared with the predictions of Quantum Chromo Dynamics to O(..cap alpha../sub s/), including some O(..cap alpha../sub s//sup 2/) effects through the use of a p/sub T/ independent K factor. Sensitivity of the calculations to variations in the parameters used is discussed. A compilation of the K factor is given. Possible nuc… more

Date: December 1, 1982

Creator: Malhotra, P.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Physics with polarized beams above GeV region

During the past several years many exciting and unexpected results have been observed in experiments with polarized beams. Those results are reviewed briefly. A new polarized beam line up to 600 GeV/c is also discussed. 4 figures.

Date: January 1, 1980

Creator: Yokosawa, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Medium Energy measurements on N-N parameters. [Dept. of Physics, Univ. of Texas at Austin, Austin, Texas]

Research is reported on the following topics: Spin transfer measurements in np elastic scattering; pp elastic differential cross section measurements; single pion production in np scattering; and a new search for rare kaon decays (K[sub L][yields][mu][mu] and K[sub L][yields]ee). 68 refs., 33 figs, 3 tabs.

Date: December 1, 1992

Creator: Ambrose, D.; Bachman, M.; Coffey, P.; Glass, G.; Jobst, B.; McNaughton, K.H. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Progress report of a research program in experimental high energy physics, January 1, 1980-December 31, 1980. [Brown Univ. , Providence, Rhode Island]

An experimental program to study the interactions of hadrons and photons is being carried out with hybrid systems that include bubble chambers as visible targets as well as counter spectrometers. Experiments are being performed at the accelerators of the laboratories at Batavia, Stanford, and Geneva, Switzerland. The bubble chamber - hybrid system group is engaged in several experiments at Fermilab. Extensive analysis of the interactions of 147-GeV/c ..pi../sup +/, K/sup +/, and p in hydrogen i… more

Date: October 1, 1980

Creator: Shapiro, A. M. & Widgoff, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

New flavor production in. gamma. ,. mu. ,. nu. , and hadron beams. [Review]

During the last few years the main emphasis in the study of heavy particle production (mainly charm) by means other than e/sup +/e/sup -/ annihilation has been on the production mechanisms. This review concentrates mainly on the production data in ..gamma.., ..mu.., ..nu.., and hadron beams. The heavy flavor searches divide themselves naturally into three categories, each one characterized by its own peculiar advantages and shortcomings; these are summarized briefly. Then the following topics a… more

Date: January 1, 1980

Creator: Wojcicki, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Cross sections at hadron colliders

The predicted cross sections are given for new Z'/sup 0/ bosons, for the Drell-Yan continuum of ..mu../sup +/..mu../sup -/ pairs, for high p/sub T/ hadron jets, for high p/sub T/ single photons, and for the associated production of heavy quarks. These processes have been selected not to cover the most interesting physics, but to provide a representative selection of cross sections for which to compare various energies and luminosities.

Date: January 1, 1982

Creator: Paige, F. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mesonic and dibaryonic excitations in the. pi. NN system

A ..pi..NN theory, incorporating mesonic and dibaryonic excitation mechanisms, is introduced to give a unified description of NN and ..pi..d reactions. The mesonic mechanism is built into the theory along the line of the Paris potential. The dibaryonic excitation at short distance is introduced according to current understanding of six quark dynamics. The effect of the 2/sup +/, T = 1 six-quark state on NN and ..pi..d scattering is presented. The implication of the theory in the study of electr… more

Date: January 1, 1984

Creator: Lee, T. S. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Diproton resonances in the mass region 2100 to 2800 MeV. [Dispersion relations, scattering amplitude]

A striking energy dependence was observed in the difference between the p--p total cross sections for parallel and antiparallel longitudinal spin states, ..delta..sigma/sub L/ = sigma/sup Tot/(reverse ..-->..)-sigma/sup Tot/(double ..-->..). The structure appears around P/sub lab/ = 1.5 GeV/c where ..delta..sigma/sub L/ = -16.7 mb and is seen in sigma/sup Tot/(double ..-->..) rather than sigma/sup Tot/(reverse ..-->..). The experiments were performed at Argonne National Laboratory using a stand… more

Date: January 1, 1978

Creator: Akihiko, Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experimental search for W/Z pairs and Higgs bosons at very high energy hadron-hadron colliders

We study, from an experimental point of view, the main ways to detect standard high mass Higgs bosons (from 300 GeV up to about 1 TeV) when they decay into W- and Z-pairs at the SSC. We also consider the corresponding W- and Z/sup 0/-pair continuum which may itself provide interesting physics, and we pay some attention to the case of an intermediate mass charged Higgs decaying into tau..nu../sub tau/ (m/sub H+-/ = 300 GeV). We first explain why and how high energy pp colliders may search for Hi… more

Date: March 1, 1987

Creator: Alverson, G.; Bengtsson, H.U.; Hauptman, J.; Hedin, D.; Herrero, M.J.; Wang, E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department