Double-Polarization Experiments Using Polarized HD at LEGS.

A novel, solid, frozen-spin $H\!D$ target has been developed for measurements of double-polarization observables in the $\Delta$ resonance region. Our focus is the determination of the pion photo-production amplitudes for the neutron and proton. Cross sections, beam asymmetries and the $E$ and $G$ double-polarization observables are measured simultaneously. $E$ provides information on the GDH and Spin-Polarizability spin sum rule integrals. We report here a preliminary analysis of one month of data collected on a $\vec{H}\!\vec{D}$ target with polarizations of $ = 30.0$\% and $ = 31.5$\% and in-beam spin relaxation times of about one year. The photon beam energies ranged from 190 - 422 MeV with circular polarizations between 59\% and 100\%. Data collected during this run period focused on $\pi^0$ production from the neutron using a detector system optimized to detect the recoil neutron in coincidence with the $\pi^0$. This work is supported by the U.S. Department of Energy under contract DE-AC02-98CH10886, by the U.S. National Science Foundation, and by the the Instituto Nazionale de Fisica Nucleare, Italy.