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.

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.

PIONIC FUSION AT SUBTHRESHOLD ENERGIES

2009 ◽  
Vol 24 (02n03) ◽  
pp. 539-543
Author(s):  
L. JOULAEIZADEH ◽  
J. BACELAR ◽  
M. ESLAMI-KALANTARI ◽  
I. GAŠPARIĆ ◽  
N. KALANTAR-NAYESTANAKI ◽  
...  
Keyword(s):  
Cross Sections ◽  
Pion Production ◽  
Detection System ◽  
Nucleon Nucleon ◽  
Accelerator Facility ◽  
Production Threshold ◽  
Neutral Pions ◽  
Pion Production Threshold ◽  
Plastic Ball ◽  
Large Acceptance

In order to study the role of pions and clustering phenomena in nuclei, two experiments have been performed using the AGOR accelerator facility. In collisions of two nuclei a pion and a fused nucleus were produced. The examined reactions were 4He(3He, π0)7Be and 6Li(4He, π0)10B at beam energies about 10 MeV above the coherent pion production threshold (256 MeV and 236.4 MeV, respectively). Since the available energy is well below the pion production threshold in an elementary nucleon-nucleon process, a highly coherent mechanism is needed. We identified the reaction by measuring the fused system in the magnetic spectrometer and the produced neutral pions in the Plastic Ball detection system with large acceptance. Our experimental setup provided the exclusive cross sections by identifying all products in overdetermined kinematics. Here we present the preliminary results of the analysis for the second reaction. Angular distribution of neutral pions will be discussed.

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.

scholarly journals QCD EVOLUTION WORKSHOP: INTRODUCTION

2012 ◽  
Vol 20 ◽  
pp. 1-8 ◽  
Author(s):  
ALEXEI PROKUDIN
Keyword(s):  
Thomas Jefferson ◽  
Accelerator Facility ◽  
Jefferson Lab

The introduction talk given at the beginning of QCD Evolution workshop held in Thomas Jefferson National Accelerator Facility (Jefferson Lab) on May 14 -17, 2012.

scholarly journals The Thomas Jefferson National Accelerator Facility

Scholarpedia ◽  
2010 ◽  
Vol 5 (7) ◽  
pp. 10211
Author(s):  
Joseph Grames ◽  
Douglas Higinbotham ◽  
Hugh Montgomery
Keyword(s):  
Thomas Jefferson ◽  
Accelerator Facility
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