Absolute<i>pp</i>-elastic cross sections from 492 to 793 MeV

Abstract

Absolute pp-elastic-differential cross sections were measured at incident energies 492, 576, 642, 728, and 793 MeV from about 30\ifmmode^\circ\else\textdegree\fi{} to 90\ifmmode^\circ\else\textdegree\fi{} c.m. The total uncertainty was determined to be less than 1%, made possible by particle counting for beam normalization and extensive cross-checks of systematic effects. These new data are consistent with previous data above 600 MeV but have uncertainties about a factor of 10 smaller. Near 500 MeV these data are consistent with 90\ifmmode^\circ\else\textdegree\fi{} data from TRIUMF, but differ significantly from similar data from PSI; the cause of this discrepancy is discussed.