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Showing 1 to 18 of 18 for “"meson-exchange"”.
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The photodisintegration of the deuteron close to threshold
… deuteron photodisintegration is sensitive to meson exchange current and isobar configuration contributions in the threshold (2.225 MeV) region. These effects are manifested chiefly through Ml transitions, which reach maximum amplitude in this energy region. The calculated size of these effects …
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The interactions of hadrons containing a heavy quark in the strong coupling limit of lattice QCD
… expansions for the following six systems: meson/meson, baryon/antimeson, baryon/baryon, meson/antimeson, baryon/meson and baryon/antibaryon. For each hadron/hadron system, we consider all allowed spin and isospin configurations for the light quarks. The interaction potentials we find take …
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High Energy Measurements of the Dueteron Photodisintegration Differential Cross Section
… The results, which are neither consistent with meson exchange nor quark-exchange, remain puzzling.
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High Energy Measurements of the Deuteron Photodisintegration Differential Cross Section
… The results, which are neither consistent with meson exchange nor quark-exchange, remain puzzling.
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An absolute measurement of the photodisintegration differential cross section of the deutron
… in this energy regime is sensitive to meson exchange currents, it would have been possible to investigate the methods for incorporating these currents into calculations.
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Two-Body Photodisintegration of the Deuteron at Incident Photon Energies of 0.8--4.0 GEV
… data to other theoretical predictions given by meson-exchange theories, asymptotic amplitudes, and quark-gluon string model are also shown.
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An equation for meson states in the quark model and its application to a meson bootstrap
"A differential equation for meson states is derived from the Bethe-Salpeter equation under the conditions of the quark model. The equation is shown to imply mass relations of the form K* 2 - P2 = K2 2 - 1£ • The equation is used to attempt bootstrap calculations of the vector and pseudo-scalar …
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A study of the K[superscript -] + p [right arrow] K + N + [pi] reactions at 1.33 BeV/c
"An experiment has been performed on K meson-proton interactions using the 72"" Alvarez liquid hydrogen bubble chamber. As part of that experiment the University ·of Illinois group investigated the following topologies: 2-prong, 2-prong with 1 kink, and O-prong with an associated vee. In …
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Searching for short range correlations using (e,e'NN) reactions
… that the final state interactions (FSI) and the meson exchange currents (MEC) dominate the cross sections and the short range properties of the NN pair were substantially undermined. However, the node of the S state wave function of the pp pair at around 400 MeV/c initial momentum starts to be …
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A precision measurement of the transverse asymmetry AT̳' from quasi-elastic ³sHe [right arrow] (e [right arrow], e') process and the neutron magnetic form factor Gn̳m̳ at low Q²
… were obtained using a high-pressure spin-exchange optically-pumped polarized 3He gas target with an average polarization of 30%, a longitudinally polarized e- beam, and two High Resolution Spectrometers: HRSe and HRSh. HRSe was employed to detect scattered electrons from the quasi-elastic …
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A-2 meson production in pi-minus proton interactions at five BeV
"A study of the A2 meson has been made on data obtained from pi p interactions at 5 BeV/c in the 72""Alvarez liquid hydrogen bubble chamber. The p pi decay mode in the 4-constraint, p pi+ pi- pi- final state is treated in detail. Fit.s to the 3TI invariant mass spectrum yield a central mass value …
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Exclusive photoproduction of charged pions in hydrogen and deuterium from 1 to 6 GeV
… processes and hadron structure, from the nucleon-meson degrees of freedom in meson-exchange models at low energy to the quark-gluon degrees of freedom in pQCD at high energy, is essential for us to understand the strong interaction. The differential cross section measurements for exclusive …
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Study of the quasielastic ³He(e,e'p) reaction at Q² = 1.5 (GeV/c)² up to missing momenta of 1 GeV/c
… calculations, are observed. On a finer detail, meson exchange currents, isobaric currents and dynamical relativistic effects might be isolated with further theoretical work, in view of remaining disagreements between available calculations and the measurements. For missing momenta from 740 to …
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Precision measurement of the spin-dependent asymmetry in the threshold region of quasielastic ³He [right arrow] (e [right arrow], e)Ì
… was polarized based on the principle of spin-exchange optical pumping and the average target polarization was about 30%. The scattered electrons were detected in the two Hall A high resolution spectrometers, HRSe and HRSh. The data from HRSh were used for this analysis and covered both the …
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Measurement of fifth structure function in deuterium
… to the cross section from processes such as meson exchange currents (MEC) and isobar configurations (IC) are minimal and f~1 is particularly sensitive to final state interactions (FSI). We demonstrated the viability of the OOPS as an optimized instrument for out-of-plane spectrometry and have …
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The ²H(<i>e, e'p</i>)<i>n</i> Reaction at High Four-Momentum Transfer
… the description of nuclei in terms of nucleon/meson degrees of freedom must be supplemented by inclusion of explicit quark effects.</p> <p>The unique combination of energy, current, duty factor, and control of systematics for Hall A at Jefferson Lab made Jefferson Lab the only facility in the …
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Determination of the Helium-6 Nuclear Charge Radius Using High-Resolusion Laser Spectroscopy
The charge radius of the neutron-rich 6He (t1/2 = 807 ms) nucleus was determined to a precision of 0.7% in a laser spectroscopic measurement at Argonne National Laboratory. The 6He atoms were produced via the 12C(7Li, 6He)13N reaction at the Argonne Tandem Linac Accelerator System (ATLAS), and were …