Recoil detection with a polarized He-3 target

The ultra-thin gas targets used in storage ring internal target experiments allow low energy, heavy nuclei to emerge from the target region. A detecto r capable of analyzing these nuclei provides unique access to many nuclear reactions. We report here the first use of such a detector in conjunction w ith a polarized He-3 internal target and a polarized electron beam. The res ults of using the detector as a luminosity monitor and as a polarimeter to measure the product of beam and target polarizations are presented. The abi lity to study coherent pion production via the reactions 3 (H) over right a rrow e((e) over right arrow,e' He-3)pi(0) and 3 (H) over right arrow e((e) over right arrow,e' H-3)pi(+) is shown along with the ability of the detect or to unambiguously separate the two- and threebody breakup channels of the reaction 3 (H) over right arrow e((e) over right arrow,e' p). (C) 2000 Els evier Science B.V. All rights reserved.