Download or read book Coherent pion photoproduction by deuterons at intermediate energies written by Vidya S. Bhasin and published by . This book was released on 1980 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherent Pion Photoproduction from Deuterium at Intermediate Energies written by P. Osland and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherent Pion Photoproduction on Deuterium written by Yordanka Ilieva and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Differential cross sections of the gamma + d -> d + pi{sup 0} reaction were measured at photon beam energies between 0.5 and 2.0 GeV over a wide angular range in CM system. The experiment was performed in Hall B at Jefferson Lab using the CLAS detector. The excitation function, especially at backward CM scattering angles, has been studied with regard to effects due to intermediate on-shell eta and omega rescattering. At CM scattering angles greater than 123 deg our data clearly show an enhancement around 0.7 GeV, which could be attributed to an intermediate on-shell eta-state.
Download or read book Coherent Pion Photoproduction from Deuteron written by C. Lazard and published by . This book was released on 1974 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-10 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comprehensive Study of the Reaction Gammad Pi0d Above 500 MeV written by Yordanka Ilieva and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here we present differential cross sections for coherent pion photoproduction on the deuteron for photon energies between 0.5 and 2.0 GeV and pion center-of-mass angles between 50? and 150?. Our analysis shows that around the eta-photoproduction threshold the reaction is sensitive to intermediate eta formation and rescattering through N* (1535) excitation. At large pion angles, our scaled invariant cross sections s13((d sigma)/dt) vary about a constant value as a function of s. In a limited kinematic range, at high s and t, the invariant amplitude can be factorized in terms of deuteron and nucleon form factors, and the elementary amplitude for pion production on the free nucleon.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of the Two pion Photoproduction on the Deuteron written by and published by . This book was released on 2012 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the structure of baryons in terms of the fundamental interaction of the constituent quarks and gluons is one of the primary challenges in strong interaction physics. This interaction is governed by Quantum Chromodynamics (QCD), which is a theory for understanding the dynamics of strong. QCD displays the asymptotic freedom of hadrons at very short distances and also the confinement of quarks and gluons inside hadrons. However, solutions of this QCD theory in the non-perturbative domain of the interaction are extremely difficult to achieve, mainly because confinement happens on the hadronic scale on which the coupling constant is large and prevents any perturbative approach. Thus leaving us with strategies such as lattice QCD or formulating QCD sum rules to get around this problem. In exclusive hadron production the yN interaction is recognized for being a powerful method for investigating hadrons and the mysteries that still exist within the strong interaction. From reactions with the nucleon, the strong interaction can be investigated through the transition amplitudes to the N and Delta resonances. More specifically, if an electromagnetic interaction is well known then the intermediate resonance states may be evaluated through meson photoproduction. To gain more detailed insight into this interaction, we look to probe the baryon structure of the nucleon and the photo-excited resonance decays through photon scattering off a deuteron producing two pions in the final state. This photoproduction process off the deuteron will be used to investigate known baryon resonances in the two pion channel. The two pion final state will be investigated for unraveling new information into the photo-coupling strengths. We want to explore final state interactions, search for properties of known resonances, and to explore the possibility of seeing missing states that are predicted by quark models but have not yet been found experimentally. Using the CEBAF Large Acceptance Spectrometer (CLAS), the hadronic products are detected in coincidence with the incident scattered photon on a deuterium target. This makes it possible to measure the single differential cross sections and the decay angular distributions for the production of two pion final states. The measured cross sections will contribute significantly to a better understanding of the coupling strengths that govern the baryonic and mesonic resonances which will push the knowledge of the strong interaction to a next level. We use CLAS to study the two pion channel from the eg3 data set, for resonance production, specifically investigating the exclusive reaction of yd --> p pi^+pi^?n, and comparing the relevant cross sections to already existing data sets. The eg3 data set provided an excellent data set for investigating photo-induced baryonic and mesonic resonances. It contains a large photon tagging range from 1.1 to 5.5 GeV in the study of photo-coupling strengths, as well as an available two pion reaction channel for resonant decay study. These measurements provide unique and coherent results from tagged photons over a broad range of energy, and represent the only two pion production data above 5 GeV at this present time. We found that the data produced good comparable single-differentials cross sections to other existing CLAS (gll dataset) two pion differential cross sections, and an excellent comparable total cross section to published (ELSA and ABBHHM) two pion total cross sections.
Download or read book Coherent P Production Off Deuteron Near Threshold written by Eed M. Darwish and published by LAP Lambert Academic Publishing. This book was released on 2015-12-10 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent -photoproduction off the deuteron near -threshold is investigated within an approach which includes the amplitudes of impulse approximation, two-step process with N- and N-rescattering, and intermediate NN interaction. Results for unpolarized and polarized cross sections as well as for all possible polarization observables with polarized photons and/or oriented deuterons are predicted and compared with available data, and differences with other theoretical models are analyzed. The contribution of this reaction to the deuteron spin asymmetry is calculated and its contribution to the GDH integral is explicitly evaluated by integration up to a photon energy of 900 MeV. In addition, the sensitivity of the results to the elementary amplitude and the choice of the NN potential model governs the deuteron wave function is also investigated. This work is motivated by the measurements of the CLAS Collaboration at Jefferson laboratory, where a cusp-like structure in the energy dependence of the differential cross section has been observed at extremely backward pion angles."
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1982 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Meson 2002 written by Lucjan Jarczyk and published by World Scientific. This book was released on 2003 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume deals with both the experimental and theoretical aspects of meson physics; in particular, it presents new results. The main topics are: hadronic and electromagnetic meson production in various reactions; meson interaction with mesons, nucleons and nuclei; the structure of hadrons; mesons and fundamental symmetries; exotic systems. The book provides an overview of the current status of these areas, as well as of new developments, besides giving a preview of the forthcoming investigations.
Download or read book The 2nd Workshop on Perspectives in Nuclear Physics at Intermediate Energies ICTP Trieste 25 29 March 1985 written by S. Boffi and published by . This book was released on 1985 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiscal Year 1985 Department of Energy Authorization written by United States. Congress. House. Committee on Science and Technology. Subcommittee on Energy Research and Production and published by . This book was released on 1984 with total page 1554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Incoherent Pion Photoproduction on the Deuteron written by Eed M. Darwish and published by LAP Lambert Academic Publishing. This book was released on 2015-03-26 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Incoherent pion photoproduction on the deuteron is investigated with inclusion of all leading NN effects. Formal expressions for polarization observables are derived and described by various beam, target and beam-target asymmetries for polarized photons and/or oriented deuterons. Results are given for unpolarized cross sections and all possible polarization observables with polarized photons and/or oriented deuterons. The contributions to the spin asymmetry and the Gerasimov-Drell-Hearn (GDH) integral from separate channels are evaluated by explicit integration up to a photon lab-energy of 350 MeV. Effects of final-state interaction are investigated and their role in these observables are found to be significant, specially for neutral-pion production. The extracted results are compared with available experimental data and predictions of other works, and a satisfactory agreement is obtained. We expect that the results presented in this book may be useful to interpret the recent measurements from the high-intensity and high duty-factor electron accelerators MAMI, ELSA, Jefferson Lab, LEGS, MAX-Lab, SPring-8, LNS, and GRAAL."
Download or read book High Energy Physics Index written by and published by . This book was released on 1990 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
