STATUS OF MESON PHOTOPRODUCTION EXPERIMENTS WITH CLAS

2014 ◽  
Vol 26 ◽  
pp. 1460083
Author(s):  
◽  
EUGENE PASYUK
Keyword(s):  
Experimental Program ◽  
Photon Beams ◽  
Meson Photoproduction ◽  
Reaction Amplitude ◽  
Linearly Polarized ◽  
Complete Measurement ◽  
Model Independent ◽  
Baryon Spectroscopy ◽  
Large Acceptance ◽  
First Time

A large part of the experimental program in Hall B of the Jefferson Lab is dedicated to baryon spectroscopy. Meson photoproduction experiments are essential part of this program. CEBAF Large Acceptance Spectrometer (CLAS) and availability of circularly and linearly polarized tagged photon beams in combination with longitudinally and transversely polarized frozen spin targets provide unique conditions for this type of experiments. For the first time, a complete or nearly complete measurement became possible and will allow model independent extraction of the reaction amplitude. The measurements were complete with both proton and deuteron targets. An overview of the collected experimental data will be presented.

HADRON PHYSICS WITH MESON PHOTOPRODUCTION AT LEPS/SPRING-8

2011 ◽  
Vol 26 (03n04) ◽  
pp. 456-460 ◽  
Author(s):  
◽  
TOMOAKI HOTTA
Keyword(s):  
High Energy ◽  
Photon Beams ◽  
Meson Photoproduction ◽  
Hadron Physics ◽  
High Energy Electrons ◽  
Compton Backscattering ◽  
Large Acceptance ◽  
Electron Photon ◽  
Photo Production ◽  
Photoproduction Reactions

At the laser electron photon facility at SPring-8 (LEPS), meson photoproduction reactions have been studied by using highly polarized photon beams produced by the Compton backscattering of the laser off the high energy electrons. The recent activities at the LEPS experiment are overviewed. From the recent results, the meson photo-production reactions at the backward angles, and the photoproduction of Λ(1405) are discussed. In order to extend our study to wider kinematical range, construction of the new beamline and the large acceptance detector has been started.

scholarly journals Non-strange baryons (CLAS)

2020 ◽  
Vol 241 ◽  
pp. 01018
Author(s):  
Steffen Strauch
Keyword(s):  
Experimental Studies ◽  
Thomas Jefferson ◽  
Photon Beams ◽  
Accelerator Facility ◽  
Circularly Polarized ◽  
Essential Tool ◽  
Nucleon Resonances ◽  
Strange Baryons ◽  
Baryon Spectroscopy ◽  
Large Acceptance

Baryon spectroscopy is an essential tool in the study of nucleon resonances. The use of polarization observables can greatly clarify the spectrum of broad and overlapping nucleon excitations. The N* program with the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility includes experimental studies with linearly- and circularly-polarized tagged-photon beams, longitudinally- and transversely-polarized nucleon targets, and recoil polarizations. An overview of these experimental studies and recent results are presented.

scholarly journals Nucleon Spectroscopy with CLAS

2018 ◽  
Vol 172 ◽  
pp. 03004
Author(s):  
Steffen Strauch
Keyword(s):  
Experimental Studies ◽  
Photon Beams ◽  
Meson Photoproduction ◽  
Circularly Polarized ◽  
Jefferson Lab ◽  
Nucleon Resonances ◽  
Polarization Observables ◽  
Large Acceptance

Meson photoproduction is an important tool in the study of nucleon resonances. The spectrum of broad and overlapping nucleon excitations can be greatly clarified by use of polarization observables. The N* program at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) includes experimental studies with linearly- and circularly-polarized tagged-photon beams, longitudinally- and transversely-polarized nucleon targets, and recoil polarizations. Selected results from these experimental studies will be presented.

scholarly journals High-Efficiency Polarizer Reflectarray Antennas for Data Transmission Links from a CubeSat

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1802
Author(s):  
Eduardo Martinez-de-Rioja ◽  
Daniel Martinez-de-Rioja ◽  
Rafael López-Sáez ◽  
Ignacio Linares ◽  
Jose A. Encinar
Keyword(s):  
Circular Polarization ◽  
Data Transmission ◽  
High Efficiency ◽  
High Gain ◽  
Dual Band ◽  
Left Handed ◽  
Linearly Polarized ◽  
Flat Profile ◽  
First Time ◽  
Collimated Beam

This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using a linearly polarized feed, with application to high-gain antennas for data transmission links from a Cubesat. First, an 18 cm × 18 cm polarizer reflectarray operating in the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements of the prototype show an aperture efficiency of 52.7% for right-handed circular polarization (RHCP) and 57.3% for left-handed circular polarization (LHCP), both values higher than those previously reported in related works. Then, a dual-band polarizer reflectarray is presented for the first time, which operates in dual-CP in the frequency bands of 20 GHz and 30 GHz. The proposed antenna technology enables a reduction of the complexity and cost of the feed chain to operate in dual-CP, as a linear-to-circular polarizer is no longer required. This property, combined with the lightweight, flat profile and low fabrication cost of printed reflectarrays, makes the proposed antennas good candidates for Cubesat applications.

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.

Study of charged-pseudoscalar-meson photoproduction from hydrogen and deuterium with 16-GeV linearly polarized photons

1979 ◽  
Vol 20 (7) ◽  
pp. 1553-1583 ◽  
Author(s):  
D. J. Quinn ◽  
J. P. Rutherford ◽  
M. A. Shupe ◽  
D. J. Sherden ◽  
R. H. Siemann ◽  
...  
Keyword(s):  
Pseudoscalar Meson ◽  
Meson Photoproduction ◽  
Linearly Polarized ◽  
Polarized Photons

scholarly journals KSΛ PHOTOPRODUCTION ON THE NEUTRON WITHIN THE RESONANCE REGION

2014 ◽  
Vol 26 ◽  
pp. 1460100
Author(s):  
◽  
CHARLES TAYLOR ◽  
PHILIP COLE
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Photon Energy ◽  
Differential Cross ◽  
Center Of Mass ◽  
Resonance Region ◽  
Reaction Threshold ◽  
Circularly Polarized ◽  
Large Acceptance ◽  
First Time

We report some preliminary differential cross section results for the γ d → KSΛ(p) reaction using a circularly-polarized photon beam and an unpolarized LD2 target. The data was collected at the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. For this study the photon energy ranged from 1.3 to 2.53 GeV, which covers from the reaction threshold through the nucleon resonance regimes. The acceptance- and flux-corrected yields show peaks at the center-of mass energies W = 1.7 and W = 1.9 GeV. These first-time results will aid in unraveling the spectrum of non-strange excited baryons.

TWO-PROTON CORRELATION FUNCTION FOR THE pp → pp + η AND pp → pp + pions REACTIONS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 660-662
Author(s):  
◽  
PAWEŁ KLAJA ◽  
PAWEŁ MOSKAL
Keyword(s):  
Correlation Function ◽  
Heavy Ion Collisions ◽  
Meson Production ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Peak Structure ◽  
Complete Measurement ◽  
First Time

For the very first time, the correlation femtoscopy method is applied to a kinematically complete measurement of meson production in the collisions of hadrons. The shape of the two-proton correlation function derived for the pp → ppη reaction differs from that for the pp → pp(pions) and both do not show a peak structure opposite to results determined for inclusive measurements of heavy ion collisions.

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