On the spin excitation energy of the nucleon in the Skyrme model

Author:

Adam C.12,Sanchez-Guillen J.12,Wereszczynski A.3

Affiliation:

1. Departamento de Física de Partículas, Universidad de Santiago de Compostela, Spain

2. Instituto Galego de Física de Altas Enerxias, (IGFAE) E-15782 Santiago de Compostela, Spain

3. Institute of Physics, Jagiellonian University, Lojasiewicza 11, Kraków, Poland

Abstract

In the Skyrme model of nucleons and nuclei, the spin excitation energy of the nucleon is traditionally calculated by a fit of the rigid rotor quantization of spin/isospin of the fundamental Skyrmion (the hedgehog) to the masses of the nucleon and the Delta resonance. The resulting, quite large spin excitation energy of the nucleon of about [Formula: see text] is, however, rather difficult to reconcile with the small binding energies of physical nuclei, among other problems. Here, we argue that a more reliable interval of values for the spin excitation energy of the nucleon, compatible with many physical constraints is between [Formula: see text] and [Formula: see text]. The fit of the rigid rotor to the Delta, on the other hand, is problematic in any case, because it implies the use of a nonrelativistic method for a highly relativistic system.

Publisher

World Scientific Pub Co Pte Lt

Subject

General Physics and Astronomy,Nuclear and High Energy Physics

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