Morgan, M.A.Miller, G.A.Thomas, A.W.2014-10-242014-10-241986Physical Review D: Particles, Fields, Gravitation and Cosmology, 1986; 33(3):817-8290556-28211550-2368http://hdl.handle.net/2440/86636Two versions of the cloudy-bag model (surface and volume coupling) satisfy the commutation relations of current algebra. Perturbation-theory evaluations of various observables are compared for the two treatments. The electromagnetic properties are essentially the same in both versions. The volume-coupling model contains, in lowest order, a pion-quark contact interaction that contributes to the axial-vector current. Including the effect of this term leads to a computed value of gA of about 1.25, if the radius of the nucleon bag is around 1.0 fm.en© 1986 The American Physical SocietyJournal article003001031210.1103/PhysRevD.33.817A1986AYG18000242-s2.0-0001398615116471Thomas, A.W. [0000-0003-0026-499X]