We present measurements of the differential cross section and 'B; recoil polarization for the γpK+Λ reaction made using the CLAS detector at Jefferson Lab. These measurements cover the center-of-mass energy range from 1.62 to 2.84 GeV and a wide range of center-of-mass K+ production angles. Independent analyses were performed using the K+ and K+p (missing π) final-state topologies; results from these analyses were found to exhibit good agreement. These differential-cross-section measurements show excellent agreement with previous CLAS and LEPS results and offer increased precision and a 300-MeV increase in energy coverage. The recoil polarization data agree well with previous results and offer a large increase in precision and a 500-MeV extension in energy range. The increased center-of-mass energy range that these data represent will allow for independent study of nonresonant K+'B; photoproduction mechanisms at all production angles.

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Copyright © 2010 American Physical Society. This article first appeared in Physical Review C 81, no. 2 (February 11, 2010): 025201: 1-20. doi:10.1103/PhysRevC.81.025201.

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