INVESTIGATION OF NARROW RESONANCES IN THE DIFFERENTIAL CROSS-SECTION FOR ELASTIC PROTON PROTON-SCATTERING IN THE ENERGY-RANGE 116-199 MEV

Measurements have been made of the energy dependence of the relative d ifferential cross section for elastic pp scattering in the interval 11 6-199 MeV at energy steps of 0.4 MeV (step with respect to the effecti ve mass of the two protons almost-equal-to 0.2 MeV/c2) in order to loo k for narrow dibaryonic resonances. The mass resolution was GAMMA(res) almost-equal-to 0.26 MeV/c2. Signals at masses 1936, 1951, 1958, and 1971 MeV/c2 were found. The statistical significances of the putative resonances are 93, 80, 99.4, and 97%, respectively. The widths of the observed enhancements are GAMMA(R) almost-equal-to 0.14-0.04 MeV/c2. T he masses of the presumed resonances are close to the masses observed in other experiments. A comparison is made with the predictions of som e theoretical models.