Measurement of H-2((gamma)over-right-arrow,p)n with linearly polarized photons in the Delta resonance region - art. no. 024604

The photodisintegration of deuterium with linearly polarized light has been measured in the energy range of 110-315 MeV. The results of five independe nt measurements using three detector systems, two liquid target,geometries, and two photon energy distribution end points are presented. These data ar e combined into one average data set with a systematic uncertainty of +/-5% . The statistical precision of this combined data set, coupled with the sen sitivity to the strength of the shea range tensor interaction observed in t he parallel-perpendicular cross section difference, makes this an attractiv e reaction for investigating aspects of the NN interaction. To do this reli ably requires a complete, systematic description of the reaction through th e Delta region. Recent NN-N Delta coupled-channel calculations which includ e fully retarded pion potentials are compared with multipole fits to the da ta. These calculations cannot reproduce the energy and angle dependence of the data. The character of the disagreement suggests that the remaining pro blems may lie with the treatment of the Delta.