Phase-Shift Analysis of Data and the Determination of the Scattering Amplitude in the Nucleon Energy Region Above Pion-Production Threshold

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Abstract
Historically it has become a habit in our Laboratory that the phase-shift analysis is carried out by the experimenters. Thus, each experimental investigation is completed by improving the earlier results of the phase-shift analysis and thus, the phase-shift analysis may be considered as an original method for the treatment of experimental data. The phase-shift analysis turns out to be a means first, to test how well new experimental results agree with the whole collection of earlier known data and, second, to more accurately plan further experiments. In our conditions a phase-shift analysis program is used at one energy. The program implies the following assumptions: (1) There is a charge independence of nuclear forces. (2) Nucleon interaction in states with high orbital momenta is correctly described with a one-pion Feynman diagram. (3) Orbital momenta, beginning from those for which a one-pion approximation can be justified, are determined keeping in mind that in the one-pion approximation, polarization in nucleon-nucleon scattering is equal to 0. (4) Pions are produced, mainly, from initial states with total isotopic spin 1. Results of our analyses will be given.

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