scholarly journals MEASUREMENTS OF SPIN OBSERVABLES IN PSEUDOSCALAR-MESON PHOTOPRODUCTION USING POLARIZED NEUTRONS IN SOLID HD

2014 ◽  
Vol 26 ◽  
pp. 1460079 ◽  
Author(s):  
◽  
TSUNEO KAGEYA
Keyword(s):  
Scalar Meson ◽  
Photon Beams ◽  
Accelerator Facility ◽  
Polarized Neutrons ◽  
Spin Observables ◽  
Free Neutron ◽  
Linearly Polarized ◽  
Complete Set ◽  
Solid Hd ◽  
Photo Production

Psuedo-scalar meson photo production measurements have been carried out with longitudinally-polarized neutrons using the circularly and linearly polarized photon beams and the CLAS at Thomas Jefferson National Accelerator Facility (Jlab). The experiment aims to obtain a complete set of spin observables on an efficient neutron target. Preliminary E asymmetries for the exclusive reaction, γ + n(p) → π- + p(p), selecting quasi free neutron kinematics are discussed.

scholarly journals Spin observables in charged pion photo-production from polarized neutrons in solid HD at Jefferson Lab

2018 ◽  
Author(s):  
Tsuneo Kageya ◽  
D. Ho ◽  
P. Peng ◽  
F. Klein ◽  
A.M. Sandorfi ◽  
...  
Keyword(s):  
Charged Pion ◽  
Polarized Neutrons ◽  
Jefferson Lab ◽  
Spin Observables ◽  
Solid Hd ◽  
Photo Production

scholarly journals Recent results from LEPS and status of LEPS2

2019 ◽  
Vol 199 ◽  
pp. 01020
Author(s):  
Masaru Yosoi
Keyword(s):  
Compton Scattering ◽  
Nuclear Physics ◽  
High Energy ◽  
Current Status ◽  
High Energy Photon ◽  
Photon Beams ◽  
Energy Photon ◽  
Linearly Polarized ◽  
Photo Production

Two high-energy photon beamlines, LEPS and LEPS2, have been operated at SPring-8. In both beamlines, linearly polarized photon beams up to 2.9 GeV produced by laser-induced backward Compton scattering from 8 GeV electrons have been used to study quark-nuclear physics via the photo-production of hadrons. In this article, I present some recent results from LEPS including the coherent ø photoproduction from 4He and γp → π− Δ++ reaction, and report on the current status of the developments of the LEPS2 solenoid spectrometer.

THE SCIENCE OF CONFINEMENT AND THE GLUEX/HALL D PROJECT AT JEFFERSON LAB

2003 ◽  
Vol 18 (03) ◽  
pp. 397-404 ◽  
Author(s):  
Alex R. Dzierba
Keyword(s):  
Degrees Of Freedom ◽  
Meson Production ◽  
First Year ◽  
Jefferson Lab ◽  
Coherent Bremsstrahlung ◽  
Linearly Polarized ◽  
Quantitative Understanding ◽  
Current Maximum ◽  
Photo Production ◽  
Photoproduction Data

One of the outstanding and fundamental questions in physics is the quantitative understanding of the confinement of quarks and gluons in quantum chromodynamics (QCD). Confinement is a unique feature of QCD. Exotic hybrid mesons manifest gluonic degrees of freedom and their spectroscopy will provide the crucial data needed to test assumptions in lattice QCD and phenomenology leading to confinement. Photo-production is expected to be particularly effective in producing exotic hybrids but data using photon probes are sparse. At Jefferson Lab, plans are underway to use the coherent bremsstrahlung technique to produce a linearly polarized photon beam. A solenoid-based hermetic detector will be used to collected data on meson production and decays with statistics that will exceed the current photoproduction data in hand by several orders of magnitude after the first year of running. In order to reach the ideal photon energy of 9 GeV/c for this mapping of the exotic spectra, the energy of the Jefferson Lab electron accelerator, CEBAF, will be doubled from its current maximum of 6 GeV to 12 GeV. The physics and project are described.

UPGRADE FOR THE CBELSA/TAPS EXPERIMENT AT ELSA FOR η AND η′ DECAYS

2010 ◽  
Vol 19 (05n06) ◽  
pp. 938-945 ◽  
Author(s):  
◽  
MICHAEL LANG
Keyword(s):  
Cross Sections ◽  
Major Part ◽  
Charged Particles ◽  
Final State ◽  
Accelerator Facility ◽  
Neutral Particles ◽  
Tracking Detector ◽  
Set Up ◽  
Photo Production

The CBELSA/TAPS experiment is a set up installed at the accelerator facility ELSA in Bonn. It is used to measure cross sections of hadronic reactions by observing final state particles. The set up is well suited for the identification of neutral particles such as neutrons and photons (e.g. from π0 decay). It is planed to access the major part of η and η′ photo production and decays as also strangeness. This requires a neutral trigger capability for the detector set up and a tracking detector for charged particles.

scholarly journals Astrophysical relevance of the low-energy dipole strength of 206Pb

2018 ◽  
Vol 178 ◽  
pp. 04003
Author(s):  
A.P. Tonchev ◽  
N. Tsoneva ◽  
S. Goriely ◽  
C. Bhatia ◽  
C.W. Arnold ◽  
...  
Keyword(s):  
Excited States ◽  
Experimental Information ◽  
Neutron Separation Energy ◽  
Resonance Fluorescence ◽  
Photon Beams ◽  
Dipole Strength ◽  
Nuclear Resonance Fluorescence ◽  
Decay Widths ◽  
Linearly Polarized ◽  
Important Branch

The dipole strength of 206Pb was studied below the neutron separation energy using photon scattering experiments at the HIGS facility. Utilizing the technique of nuclear resonance fluorescence with 100% linearly-polarized photon beams, the spins, parities, branching ratios and decay widths of excited states in 206Pb from 4.9 - 8.1 MeV have been measured. The new experimental information is used to reliably predict the neutron capture cross section of 205Pb, an important branch point nucleus along the s-process path of nucleosynthesis.

scholarly journals Latest results from GlueX

2019 ◽  
Vol 199 ◽  
pp. 01004 ◽  
Author(s):  
Thomas Britton
Keyword(s):  
Degrees Of Freedom ◽  
Beam Polarization ◽  
Accelerator Facility ◽  
Exotic Mesons ◽  
Newport News ◽  
Hybrid Mesons ◽  
Quantum Numbers ◽  
Coherent Bremsstrahlung ◽  
Linearly Polarized ◽  
Beam Incident

The GlueX experiment is housed in the newest experimental hall at the Thomas Jefferson National Accelerator Facility in Newport News, Virginia. It was successfully commissioned in 2015 and is in its third year of data taking. GlueX uses a 12 GeV electron beam incident on a diamond radiator, producing a linearly polarized, coherent Bremsstrahlung photon beam. The ultimate goal of GlueX is to search for exotic hybrid mesons (e.g. qq̄g), with either exotic or conventional quantum numbers, whose existence, or lack thereof, would allow for the exploration of the gluon-gluon coupling present in QCD through the manifestation of hadrons with gluonic degrees of freedom. Photo-production at these energies is fairly unexplored and the linear beam polarization allows GlueX to discriminate between various production mechanisms which may be an effective way to identify such exotic hybrid mesons. In addition to exotic mesons, GlueX will also be poised to map out the conventional meson spectrum and to study the spectrum of excited vector mesons, which are often poorly understood. In these proceedings, we will present an overview of the GlueX experiment, its goals, current physics results, and future plans.

Measurement of a complete set of spin observables in the 2H(p,n)2p reaction at 200 MeV

1998 ◽  
Vol 631 ◽  
pp. 752-756 ◽  
Author(s):  
B.D. Anderson ◽  
D.L. Prout ◽  
M. Palarczyk ◽  
A. Ahmidouch ◽  
A.R. Baldwin ◽  
...  
Keyword(s):  
Spin Observables ◽  
Complete Set

N* PHYSICS AT MAMI — RESULTS AND PERSPECTIVES

2014 ◽  
Vol 26 ◽  
pp. 1460051
Author(s):  
MICHAEL OSTRICK
Keyword(s):  
Partial Wave ◽  
Scalar Meson ◽  
Crystal Ball ◽  
Preliminary Results ◽  
Model Independent ◽  
Pseudo Scalar ◽  
Photo Production

New measurements of transverse target and beam-target asymmetries in pion photo-production were performed using the Crystal Ball at the Mainz Microtron MAMI. Preliminary results are discussed in the context of model-independent partial wave analyses for pseudo-scalar meson photo-production below Ecm = 2 GeV.

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