Radiative Capture and Charge Exchange of Negative Pions on Protons at 27.4-{MeV} and 39.3-{MeV}

The π − p → γ n and π − p → π − o n reactions were studied at laboratory pion kinetic energies of 27.4 and 39.3 MeV for 9 angles. The differential cross sections of the π − p → γ n reaction are compared with previous data and with several calculations. The π − p → π − o n differential cross sections were obtained by unfolding the energy spectra of the π o γ-ray decays. Pion-nucleon phase shifts and scattering lengths are deduced and good agreement is obtained with the elastic channels, supporting isospin invariance.

Nuclear Reactions
PI- P: RADIATIVE CAPTURE
RADIATIVE CAPTURE: PI- P
PI- P: CHARGE EXCHANGE
CHARGE EXCHANGE: PI- P
DIFFERENTIAL CROSS SECTION: ANGULAR DEPENDENCE
ANGULAR DEPENDENCE: DIFFERENTIAL CROSS SECTION
CHANNEL CROSS SECTION: ENERGY DEPENDENCE
PI NUCLEON: PARTIAL WAVE
PI NUCLEON: SCATTERING LENGTH

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