ABSOLUTE DIFFERENTIAL CROSS-SECTIONS FOR PI+/- P ELASTIC-SCATTERING AT 30-LESS-THAN-OR-EQUAL-TO-T-PI-LESS-THAN-OR-EQUAL-TO-67 MEV

Absolute p differential cross sections have been measured at incident pion energies of 30.0, 45.0, and 66.8 MeV, using active targets of scintillator plastic (CH1.1) to detect recoil protons in coincidence with scattered pions. Statistical uncertainties are typically ±3%; systematic uncertainties are ±. The results are consistent with two earlier measurements by this group employing different experimental techniques at 67 MeV and higher incident pion energies. The -p cross sections are in good agreement with currently accepted phase-shift analyses, but the corresponding +p predictions are typically 15% higher at large angles than the +p cross sections reported here. © 1990 The American Physical Society.