CEBAF EXPERIMENT 94-012 Measurement of Photoproton Polarization
نویسندگان
چکیده
An important issue in intermediate energy physics is to what degree one can understand exclusive reactions from the viewpoint of perturbative quantum chromodynamics, pQCD. Strong theoretical arguments exist that pQCD should not be applicable at intermediate energies and momentum transfers, but experimental cross sections generally follow the constituent counting rules that can be derived from pQCD. Polarization data are limited, but suggest for pp scattering that a simple pQCD picture is not applicable.
منابع مشابه
CEBAF EXPERIMENT 89-033 Measurement of Recoil Polarization in the 16O (e,e’p) Reaction with 4 GeV Electrons
This is an initial testing ground for the measurement of polarization observables in electron scattering on nuclei; it is one of the few experiments on a target heavier than helium proposed at this time for CEBAF. All three components of the polarization of the recoil proton will be measured for proton recoil momenta up to 300 MeV/c at a constant momentum transfer of 500 MeV/c using the focal p...
متن کاملElectron Spin Precession at CEBAF
The nuclear physics experiments at the Thomas Jefferson National Accelerator Facility often require longitudinally polarized electrons to be simultaneously delivered to three experimental halls. The degree of longitudinal polarization to each hall varies as function of the accelerator settings, making it challenging in certain situations to deliver a high degree of longitudinal polarization to ...
متن کاملTHE CONTINUOUS ELECTRON BEAM ACCELERATOR FACILITY: CEBAF at the Jefferson Laboratory
■ Abstract The Jefferson Laboratory’s superconducting radiofrequency (srf ) Continuous Electron Beam Accelerator Facility (CEBAF) provides multi-GeV continuouswave (cw) beams for experiments at the nuclear and particle physics interface. CEBAF comprises two antiparallel linacs linked by nine recirculation beam lines for up to five passes. By the early 1990s, accelerator installation was proceed...
متن کاملCharacterization of the Analyzing Target of the PEPPo Experiment
The purpose of the PEPPO experiment is to demonstrate, for the first time, the production of polarized positrons from a polarized electron beam. The experiment was performed in Spring 2012 at the CEBAF injector of Jefferson Laboratory (JLab) using a highly spin polarized electron beam. The positron polarization was measured by means of a Compton transmission polarimeter. This work discuss the e...
متن کاملThomas Jefferson National Accelerator Facility JLAB-TN-01-029 UNIQUE ELECTRON POLARIMETER COMPARISON AND SPIN–BASED ENERGY MEASUREMENT
A careful intercomparison of the relative analyzing power of five electron beam polarimeters was performed with the CEBAF accelerator at Thomas Jefferson National Accelerator Facility (JLab) during a dedicated two day machine development period. This is the first time such a high precision comparison between polarimeters of the Mott, Compton, and Møller type has been made. A Wien–style spin man...
متن کامل