## The elastic scattering of negative pions by protons at 230, 290, 370, and 427 Mev |

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absorber thickness accidentals appearing in Eq area element average barycentric beam contamination beryllium calculated charge independence charge-exchange coefficients coincidence circuit collimator copper absorber correction coulomb counter telescope counting rate D-wave phase shifts data run detected detector determined differential cross sections differential-cross-section discussed in Section Dispersion Relations efficiency elastically scattered pions electron contamination electron-shower equation experiment extrapolated F waves fine-structure pulse formula H H H Hewlett-Packard higher energies IBM-650 computer program inelastic integral range curve kinematics program Appendix kinetic energy laboratory angle laboratory differential cross laboratory system least-squares fits listed in Table lower energies mb/sterad momentum monitor count muon contamination Mylar negative pions obtained from Eq particles pion beam pion energy pion-nucleon pion-production points Prescaler protons quadrupole magnet quantities Scaler scattering amplitude Scintillation counter shown in Fig solid angle standard-deviation error Table XIV target and telescope theoretical values total cross section waves wedge magnet wire-orbit zero