Journal article

Publication year: 1996

Pages: 99-106

Journal: Zeitschrift für Physik A, Hadrons and Nuclei

Volume number: 356

Issue number: 1

ISSN: 0939-7922

DOI Link: https://doi.org/10.1007/s002180050153

Publisher: Springer

Abstract: 
Excited states of the nucleon are described as RPA configurations on a mean-field groundstate taken from the MIT bag model. A residual interaction of a structure as in the Nambu-Jona-Lasinio model is used. The particle-hole states are coupled to good total angular momentum and isospin. Valence excitations of particle-hole type and quark-antiquark () states from the Dirac-sea are included. The dependence of the baryon spectrum and multipole response functions on the coupling constant G is studied. At critical values of G the 3q-ground state becomes degenerate with strongly collective modes. The model is used to calculate the averaged electric polarizability of the neutron and the proton alpha. Without residual interaction alpha = 7 10(-4) f m(3) is found. With residual interaction the value increases to alpha = (7 - 11). 10(-4) f m(3). The measured value of alpha is reproduced within experimental error bars.

Harvard Citation style: Geiss, J., Lenske, H. and Mosel, U. (1996) RPA description of the electric polarizability of the nucleon, Zeitschrift für Physik A, Hadrons and Nuclei, 356(1), pp. 99-106. https://doi.org/10.1007/s002180050153

APA Citation style: Geiss, J., Lenske, H., & Mosel, U. (1996). RPA description of the electric polarizability of the nucleon. Zeitschrift für Physik A, Hadrons and Nuclei. 356(1), 99-106. https://doi.org/10.1007/s002180050153