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The structure of the nucleon

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Il Nuovo Cimento (1955-1965)

Summary

We derive from the fixed source meson theory an exact relation connecting the structure of the physical nucleon to the mesonnucleon scattering amplitudes. General formulae are obtained for the charge and current densities of the meson cloud of the nucleon. Using these results it is possible to obtain an upper limit of 5.5 meson masses for the cut-off and of 1.65 for the average number of mesons in the cloud. The nucleon magnetic moments take the correct experimental values ±1.9 in correspondence of a cut-off to 5 meson masses.

Riassunto

Si ricava, a partire dalla teoria mesonica di sorgente fissa, una relazione esatta fra la struttura del nucléon fisico e le fasi dell’urto mesone-nuoleone. Si ottengono delle formule generali per le densità di carica e di corrente della nuvola mesonica del nucleone. Questi risultati ci permettono di ottenere un limite superiore di 5.5 masse mesoniche per il taglio e di 1.65 per il numero medio di mesoni nella nuvola. Per un taglio a 5 masse mesoniche i momenti magnetici dei nuoleoni assumono i valori ±1.9, in accordo con l’esperienza.

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References

  1. R. Hofstadter andW. R. McAllister:Phys. Rev.,98, 217 (1955).

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  2. M. Cini andS. Fubini:Nuovo Cimento,3, 764 (1956) quoted in the following as I.

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  3. See e.g.G. Wentzel:Quantum Theory of Fields (New York, 1949). This author uses a convention opposite to ours for the isotopic spin of the nucleons.

  4. M. Cini, S. Fubini andA. Stanghellini:Nuovo Cimento,3, 1379 (1956).

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  5. W. Thirring : comunication at the Rochester Conference, 1956.

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Fubini, S. The structure of the nucleon. Nuovo Cim 3, 1425–1432 (1956). https://doi.org/10.1007/BF02785018

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  • DOI: https://doi.org/10.1007/BF02785018

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