Improved 3D-imaging detection at the Cryogenic Storage Ring

The study of electron induced molecular fragmentation processes in fast-beam experiments sets high demands on the technical realization of appropriate detection techniques. A complete reconstruction of the total kinetic energy release and thus detailed physical information of this process can only be deduced from the fully correlated measurement of distances. Therefore, the reaction product detector must be able to measure both the impact positions on the detectors surface as well as the time difference between impacts with the highest resolution. In this work a new timing readout for the 3D-imaging detector NICE at the Cryogenic Storage Ring in Heidelberg was set up and tested for the first time. The upgrade is based on the silicon photomultiplier technology, employing a multi-pixel detector with high intrinsic time resolution. First performance test show promising results: it was possible to resolve spatially well separated impacts with a time difference down to zero, exceeding the time resolution limit of the pre-existing setup

Exploring the Spin Structure of the Proton with Two-Body Partonic Scattering at RHIC

The STAR collaboration at the Relativistic Heavy Ion Collider is using polarized proton beams at sqrt{s} = 200 GeV to study the spin structure of the proton. The first results for the double spin helicity dependence of inclusive jet production are presented along with projections for additional data taken in 2005 and 2006. When fully analyzed these data sets should place strong constraints on the possible contribution of gluonic spin to the proton spin as expressed by Delta G. Future studies using 2-jet or photon-jet coincidences to map out the gluon spin distribution vs. the gluon's momentum fraction of the proton are discussed.Comment: 4 pages, 2 figures, presented at the 18th Int. IUPAP Conf. on Few-Body Problems in Physics, Santos, Sao Paulo, Brazil, August 21-26,200