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 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.

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.

PHOTOREACTIONS ON 3He AND 4He UP TO 1.6 GEV AT JEFFERSON LAB

2003 ◽  
Vol 18 (02n06) ◽  
pp. 225-234
Author(s):  
◽  
B. L. BERMAN
Keyword(s):  
Beam Energy ◽  
Full Range ◽  
Electron Beam Energy ◽  
Polarized Electrons ◽  
Circularly Polarized ◽  
Jefferson Lab ◽  
Incident Electron Beam ◽  
Reaction Channels ◽  
Large Acceptance ◽  
Polarized Photons

We have measured photoreactions on 3 He and 4 He in Hall B at Jefferson Lab, using real photons from the Photon Tagger and the CEBAF Large-Acceptance Spectrometer (CLAS). We obtained data over the full range of the Tagger — 0.33 to 1.56 GeV with an incident electron-beam energy of 1.645 GeV. Tagged, circularly polarized photons, produced by the 70% longitudinally polarized electrons, were incident on 1.2-g/cm2 liquid-helium targets positioned at the center of the CLAS. We were able to collect data at rates exceeding 3 kHz, and succeeded in collecting approximately 1.2 billion events for 3 He and 0.8 billion for 4 He . Over 5 Tb of data were obtained. The data show very good stability throughout the experimental run. Preliminary results from the analysis of several reaction channels are given here.

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.

scholarly journals Studying neutron structure at Jefferson Lab through electron scattering off the deuteron, using CLAS12 and the Central Neutron Detector

2020 ◽  
Vol 1643 (1) ◽  
pp. 012191
Author(s):  
Paul Naidoo ◽  
Daria Sokhan ◽  
Pierre Chatagnon ◽  
Silvia Niccolai ◽  
Katheryne Price
Keyword(s):  
Neutron Detector ◽  
Meson Production ◽  
Deeply Virtual Compton Scattering ◽  
Virtual Compton Scattering ◽  
High Energy ◽  
Neutral Meson ◽  
Deuteron Target ◽  
Jefferson Lab ◽  
3D Tomography ◽  
Large Acceptance

Abstract Generalised Parton Distributions (GPDs) offer a way of imaging nucleons through 3D tomography. They can be accessed experimentally in processes such as Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP), where a high energy electron scatters from a quark inside a nucleon and a high energy photon or meson is produced as a result. Jefferson Lab has recently completed its energy upgrade and Hall B houses the new, large-acceptance CLAS12 detector array optimised for measurements of DVCS and DVMP in the newly accessible kinematic regime. Measurements on the proton and neutron are complementary and both are necessary to facilitate access to the full set of GPDs and enable their flavour separation. Neutron DVCS and DVMP are possible with the use of a deuteron target – the first CLAS12 experiment with which has started taking data this year. To enable exclusive reconstruction of DVCS and neutral-meson DVMP, a dedicated detector for recoiling neutrons – the Central Neutron Detector (CND) – was integrated into CLAS12. We present the first CLAS12 deuteron-target experiment, with a focus on the performance of the CND.

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