Observation of a narrow structure in the pp elastic scattering at T(sub kin) = 2.11 GeV

摘要

The angular dependences of the pp elastic scattering analyzing power, spin correlation, depolarization transfer were measured in the angular range from 60(degrees) to 97(degrees) CM at 14 energies between 1.96 and 2 .23 GeV. At fixed angles two maxima were observed in the analyzing Power energy dependence, both below and above 2.11 GeV. Furthermore a rapid decrease Of the spin correlation Parameter at 90(degrees) CM occurs around this energy. The observables allow determination of the absolute values of three nonvanishing pp amplitudes at 90(degrees). The energy dependence of the spin-single amplitude shows a shoulder centered at 2.11 GeV, while the spin-triplet amplitudes are decreasing functions of energy snowing no evidence of structure. All experimental data are listed in tables and their energy dependences are shown in figures.