The First Pion Photoproduction Results From Polarized Hd At Legs

C Steven Whisnant, K Ardashev,V Bellini, M Blecher, C Cacace,A Caracappa,Andrzej Cichocki, C Commeaux,I Danchev,A Dangelo,J P Didelez, R Deininger,C Gibson,K Hicks,S Hoblit,Arnold Honig,T Kageya, M Khandaker,O C Kistner, A J Kuczewski,F Lincoln, R A Lindgren,A Lehmann,M Lowry,M Lucas,Jeffrey L Mahon, Henry O A Meyer, Lino Miceli, D Moriccianni,B M Preedom, B E Norum,T Saitoh,A M Sandorfi,C Schaerf,D J Tedeschi,C E Thorn,Karen Wang,Xiangdong Wei

PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC INTERACTIONS IN NUCLEAR AND HADRON PHYSICS（2002）

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摘要

A solid, polarized HD target has been developed for the measurement of double-polarization observables in the Delta resonance region. We report here the inaugural data obtained with this target. This new polarized target technology, combined with the high quality LEGS photon beam and the large acceptance spectrometer, SASY, provides a unique facility for studying the spin structure of the nucleon below 500 MeV. Pion production data collected on a longitudinally polarized target with six gamma-ray polarization states provides the first simultaneous measurement of d sigma/d Omega, as well as the Sigma, G and E asymmetries. With the future addition of magnetic analysis to SASY, a complete set of pion production observables on the proton and the deuteron (neutron) will be obtained.

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data collection,gamma ray,spin structure

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