JLab: probing hadronic physics with electrons and photons

Abstract

Precision measurements of the structure of nucleons and nuclei in the regime of strong interaction QCD are now possible with the availability of high current polarized electron beams, polarized targets, and recoil polarimeters, in conjunction with modern spectrometers and detector instrumentation. The physics at JLab will be highlighted using two recent measurements of general interest. The ratio of the proton electric to magnetic form factors indicates the importance of the role of angular momentum in the structure of the nucleon. The existence of 5-quark configurations in the ground state wavefunctions of hadrons is confirmed by a narrow peak attributed to an exotic baryon with strangeness S=+1. These and other examples will be used to illustrate the capabilities and focus of the experimental program at JLab.

Solution Route to PbSe Films with Enhanced Thermoelectric Transport Properties

“…Desorption of oxygen from the film surface at high temperature usually decreases the carrier concentration in a “p” type sample and thus increases the resistance of the sample. The other is a sharp decrease in mobility due to creation of defects at elevated temperature as proposed by Smith 29. It was argued that, in lead chalcogenides, defects will be created at high temperature.…”