Spin Correlation Parameters for 50 MeV Proton-Proton Scattering

Two kinds of measurements of the spin correlation parameters at 900c.M. for the 50 MeV proton-proton scattering have been performed.For the first step, the spin correlation parameters CKp (900o.y,.)and CNN (900c.}i.) at 52 MeV have been obtained by means of double scattering fnethod, where the carbon polarimeter having nearly 40% analyzing power was used as a polarization analyzer.For the second step, the spin correlation parameters Axx (90Oc.M.) and Ayy (90Oc.},f.) at 47.5 MeV have been measured by using polarized beam and polarized target, where the nearly 50e/.polarized protons were provided by p-Ca elastlc scattering and the meafily 350/.poiarized hydrogen target was constructed by means of dynamic polarization method.The incident proton spins were frequently flipped by a spin rotation solenoid and sometimes the target spins were inverted.Then, Axx and Ayy were simultaneously measured by two pairs of detecting systems.The obtained results are as follows; CKp(900c.}f.; 52 MeV)==O.13iO.11,CNN(900cmf.: 52 MeV)== -O.034IO.095,Axx (900c."i.: 47.5 MeV)=:-O.713Å}O.032 and Ayy (900c.,,f.: 47.5 MeV)z-O.287Å}O.039, and also Ayy/Axx (900c.M.: 47.5 MeV)==O.402t O.057.These resuits are compared with the phase shift analyses and the petential model in the medium energy region.