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NN Experiments and NN Phase-Shift Analysis

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Handbook of Nuclear Physics

Abstract

A comprehensive partial-wave analysis of proton-proton and neutron-proton elastic scattering phenomenology from threshold to pion production threshold is presented as a guideline starting from elementary scattering theory and nuclear physics as well as statistical concepts to describe up-to-date calculations. An attempt is made to highlight and justify the essential theoretical and phenomenological features which enables a statistically satisfactory determination of NN scattering amplitudes using the large body of pp and np data including differential and polarization observables collected over 70 years. This includes proper consideration of analyticity in terms of a NN potential whose long-range contribution incorporates charge-dependent one pion exchange, Coulomb effects, vacuum polarization, magnetic moment interactions and relativistic corrections on the theoretical side, and a statistically motivated selection of mutually consistent data on the experimental side. The approach is based on a partial-wave analysis and a coarse graining of the short-range component of the nuclear interaction and enables not only a sound determination of statistical uncertainties and their subsequent propagation to ab initio nuclear structure and nuclear reactions calculations but also a precise and accurate evidence of the one-pion exchange mechanism above a relative distance of 3 fm.

Work supported by project PID2020-114767GB-I00 funded by MCIN/AEI/10.13039/501100011033 as well as Junta de Andalucía (grant FQM-225)

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Correspondence to Enrique Ruiz Arriola .

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Arriola, E.R., Pérez, R.N. (2023). NN Experiments and NN Phase-Shift Analysis. In: Tanihata, I., Toki, H., Kajino, T. (eds) Handbook of Nuclear Physics . Springer, Singapore. https://doi.org/10.1007/978-981-15-8818-1_47-1

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  • DOI: https://doi.org/10.1007/978-981-15-8818-1_47-1

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-15-8818-1

  • Online ISBN: 978-981-15-8818-1

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