The Proton-Neutron Mass Difference and the Inner Structure of the Nucleon

概要

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A method is proposed which makes it possible to take into account the contribution from the pair state in the calculation of the proton-neutron mass difference without regard to the form of the matrix elements related to the pair state. It is shown that there exists a considerable difference between the result of our method and that of the Feynman-Speisman method in the internal region of the nucleon cloud. The model of form factors is considered in which the core exists only in the charge iso-scalar part. The result derived from this model is not satisfactory owing to the wrong sign of the mass difference. In order to get a good agreement with the empirical data it would be necessary to introduce a core at least into one of the form factors of the charge iso-vector type and of any kind of the magnetic moment type. The magnitude and the sign of the core is briefly estimated for each type of form factors.
1960-07-25