Nuclear Physics Seminars

ics Nuclear
Tuesday, February 16, 2010
3:30 PM
Physics Building, Room 204
Nevzat Guler [Host: Blaine Norum]
Old Dominion University
"Spin Structure of the Deuteron New Results from CLAS"
 Slideshow (PDF)
Double spin asymmetries for the proton and the deuteron have been measured in the EG1b experiment using the CLAS detector at Jefferson Lab. Longitudinally polarized electrons at energies 1.6, 2.5, 4.2 and 5.7 GeV were scattered from longitudinally polarized NH 3 and ND 3 targets. The double spin asymmetry Ak has been extracted from these data as a function of Q 2 and W with unprecedented precision. The virtual photon asymmetry A 1 and the spin structure function g 1 can be calculated from these measurements by using parameterizations to the world data for the virtual photon asymmetry A 2 and the unpolarized structure functions F 1 and R. The large kinematic coverage of the experiment (0.05 GeV 2 < Q 2 < 5.0 GeV 2 and 1.08 GeV < W < 3.0 GeV) helps us to better understand the spin structure of the nucleon, especially in the transition region between hadronic and quark-gluon degrees of freedom. The results from EG1b combined with other experiments provide a good description of the virtual photon asymmetries making their parameterizations possible in a large kinematic range. In this talk, the results on A 1 , g 1 and the first moment Γ 1 1 of the deuteron will be presented. The parametrization efforts on the asymmetries and the spin structure functions will be discussed. The neutron spin structure function, extracted from the combined proton and deuteron data, will be shown.

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