Absolute differential cross sections forπ±pelastic scattering at 30≤Tπ≤67 MeV

Abstract

Absolute ${\mathrm{\pi }}^{\pm }$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 (${\mathrm{CH}}_{1.1}$) to detect recoil protons in coincidence with scattered pions. Statistical uncertainties are typically ±3%; systematic uncertainties are ±2%. The results are consistent with two earlier measurements by this group employing different experimental techniques at 67 MeV and higher incident pion energies. The ${\mathrm{\pi }}^{\mathrm{-}}$p cross sections are in good agreement with currently accepted phase-shift analyses, but the corresponding ${\mathrm{\pi }}^{+}$p predictions are typically 15% higher at large angles than the ${\mathrm{\pi }}^{+}$p cross sections reported here.