Nucleon-Nucleon Polarization between 300 and 700 MeV

The polarization parameter P(θ*) has been measured at beam energies of 310, 400, 500, 600, and 700 MeV over the range in the c.m. scattering angles 30 deg<~θ*<~150 deg to an accuracy of typically ±{}0.03 for pn scattering, and ±{}0.02 for pp scattering. A polarized proton beam was scattered from an unpolarized target---deuterium for quasifree pn and pp measurements, hydrogen for free pp measurements---and both of the outgoing nucleons from the (quasi-) elastic scatter were detected by an array of 27 scintillation counters in multichannel coincidences. It was found that P(θ*) for pp scattering can be approximated by A sinθ* cosθ* where A varies from -0.25 at 310 MeV to -0.4 at 700 MeV in this range. A comparison of P(θ*) for free and quasifree pp scattering reveals good agreement between the two.